CN101881860B

CN101881860B - Device for realizing digital optical phase conjugation

Info

Publication number: CN101881860B
Application number: CN2010101904823A
Authority: CN
Inventors: 李志扬
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-05-28
Filing date: 2010-05-28
Publication date: 2011-12-07
Anticipated expiration: 2030-05-28
Also published as: CN101881860A

Abstract

The invention discloses a device for realizing digital optical phase conjugation. The device consists of an optical illumination system, a complex amplitude spatial light adjustor, a coupler and an adiabatic conical optical waveguide beam; the optical illumination system, the complex amplitude spatial light adjustor, the coupler and the adiabatic conical optical waveguide beam are placed in turn and aligned one another so that the coherent light wave emitted by the optical illumination system uniformly illuminates the complex amplitude spatial light adjustor; after the coherent light wave is subjected to amplitude and phase adjustment by the complex amplitude spatial light adjustor, the coherent light wave is coupled through the coupler and enters the tail end of the adiabatic conical optical waveguide beam; and light energy is converged in each single-mode optical waveguide core layer at the tail end of the adiabatic conical optical waveguide beam to generate phase conjugated light wave. The device effectively inhibits a high-order radiation mode, and further reduces the influence of the high-order radiation mode by changing the shape of the adiabatic conical optical waveguide beam.

Description

A kind of device of realizing digital optical phase conjugation

Technical field

The invention belongs to optical imagery and optical wavefront reconstruction field, relate more specifically to a kind of device of realizing digital optical phase conjugation, the complicated optical wavefront that is specially adapted to have the diffraction limit quality is structure more dynamically, fields such as 3-D display and measurement, virtual reality, computer man-machine exchange, robot vision.

Background technology

Only a kind of electromagnetic wave, its optical wavefront of light wave of sending from Different Light or object has different shapes.The light wave that sends of pointolite for example, its optical wavefront is a sphere, for parallel beam, its optical wavefront is the plane.And for the real-world object of a complexity, from its surface reflection or the optical wavefront sent, its structure is very complicated.By regulation and control or reconstruction to optical wavefront, we can change direction of beam propagation, improve beam quality, reappear object dimensional pattern or the like.Adopt traditional optical means and device,, can realize the regulation and control or the reconstruction of optical wavefront statically as optical lens, holographic technique etc.But,, need to realize quick dynamic optical wavefront regulation and control or rebuild as the light exchange in 3 D stereo TV, the optical communication network etc. in a lot of fields.In recent decades, development along with technology such as integrated circuit and liquid crystal displays, can carry out the spatial light modulator that pointwise is regulated mutually with the position to the amplitude of optical wavefront, its resolution has reached 10 micron dimensions, however, compare with the sub-micron visible wavelength, this resolution still comes in nowhere.Adopt the traditional optical principle, holographic technique for example, be difficult to the existing space photomodulator realize complicated optical wavefront near the dynamic structure again of the quality digital of diffraction limit.

The inventor's last invention " active optics phase conjugate method and device (patent No.: ZL200610124657.4) " has proposed dynamically structure method again of a kind of new optical wavefront, and its ultimate principle is based on the reversibility of light path.From the mathematic(al) representation of optical wavefront as can be seen, two light waves that the direction of propagation is opposite to wavefront shape is identical, their complex amplitude has conjugate relation.If the complex amplitude of the complex amplitude of a certain optical wavefront and another optical wavefront has conjugate relation conversely speaking,, so, this light wave will be along the reverse propagation in same path of back one light wave.To simple light wave, promptly to the basic mode light wave in parallel beam and the monomode optical waveguide, only need simple reflex that light path is reversed, add suitable position and regulate the optical phase conjugation that just can realize strictness mutually.In order to realize structure again to complicated optical wavefront, foregoing invention at first also progressively is directed to a series of monomode optical waveguides of isolating each other to the incident light wave decomposition, then in the monomode optical waveguide that these are isolated from each other again structure go out light wave with input light wave conjugation, these conjugation light waves are reverse by same optical waveguide structure, just can reconstruct identical with original optics wavefront shape, but the opposite conjugation light wave of direction.

Its key of optical phase conjugation method based on reversibility of optical path is to construct the light wave that has the phase conjugate relation with incident light wave.Traditional optical phase conjugate technology produces the phase conjugate light wave of incident wave by optical non-linear effect, it can only recover original input light wave, but can not newly create the optical wavefront of an arbitrary structures, the process of structure again of optical wavefront and again the structure result depend on nonlinear optical medium and original input light wave passively.And invent method that (ZL200610124657.4) propose can by Digital Control initiatively again structure go out the optical wavefront of arbitrary structures, in order to distinguish mutually with the traditional optical phase conjugate method that depends on nonlinear effect, the method that invention (ZL200610124657.4) the proposes active optics phase conjugate method of in instructions, calling oneself.In fact above-mentioned active optics phase conjugate method also has a more notable attribute, that be exactly its control procedure be digitized.In order more to meet the usage of trade, reference is popular " Digital Holography " this term for a long time, will rename as the digital optical phase conjugation method to active optics phase conjugate method in the present invention.In fact digital control process itself is exactly an active process, and therefore " digital optical phase conjugation method " this title has implication widely than " active optics phase conjugate method ", is easilier received by the people in the modern digital epoch.

Invention (ZL200610124657.4) is although proposed a kind of optical wavefront structure method and apparatus again that can Digital Control, but a few specific embodiments has only been proposed, the present invention will carry out perfect to invention (ZL200610124657.4), replenish the structure of more amplitude position phase regulation device, further improve light channel structure simultaneously with the elevator system performance, improve the quality of structure light wave again, reduce noise.

Summary of the invention

The objective of the invention is to be to provide a kind of device of realizing digital optical phase conjugation, more complex amplitude spatial light modulator embodiments are provided, make the light after the complex amplitude spatial light modulator is regulated accurately converge in the monomode optical waveguide sandwich layer of adiabatic taper optical waveguide bundle end by the structure of optimizing coupling mechanism, effectively suppressed the generation of high-order radiation mode, simultaneously by changing the shape of adiabatic taper optical waveguide bundle, further reduced the influence of high-order radiation mode, also by introducing the quality that preposition optical system has further improved the reconstruct optical wavefront, increased the size of three-dimensional image in addition.

For achieving the above object, the present invention adopts following technical measures:

A kind of device of realizing digital optical phase conjugation, it is characterized in that: it is by lamp optical system, the complex amplitude spatial light modulator, coupling mechanism and adiabatic taper optical waveguide bundle are formed, lamp optical system, the complex amplitude spatial light modulator, coupling mechanism and adiabatic taper optical waveguide bundle are placed successively, and aim at mutually, the coherent light waves that makes lamp optical system the send complex amplitude spatial light modulator that evenly throws light on, carried out the end of adiabatic taper optical waveguide bundle being coupled into through coupling mechanism again after amplitude and position are regulated mutually by the complex amplitude spatial light modulator, and luminous energy is converged in each monomode optical waveguide sandwich layer of adiabatic taper optical waveguide bundle end, produce the phase conjugate light wave.

Described a kind of device of realizing digital optical phase conjugation, it is characterized in that: described complex amplitude spatial light modulator is made up of two transmission-type liquid crystal spatial light regulators and three polaroids, first polaroid, first transmission-type liquid crystal spatial light regulator, second polaroid, second transmission-type liquid crystal spatial light regulator and the 3rd polaroid are placed successively, second transmission-type liquid crystal spatial light regulator, the pixel of first transmission-type liquid crystal spatial light regulator is aimed at one by one, regulate first polaroid, second polaroid, the polarization direction of the 3rd polaroid makes second transmission-type liquid crystal spatial light regulator, first transmission-type liquid crystal spatial light regulator works in amplitude respectively and is adjusted to holotype and is adjusted to holotype mutually with the position.

Described a kind of device of realizing digital optical phase conjugation, it is characterized in that: described complex amplitude spatial light modulator is by two transmission-type liquid crystal spatial light regulators, two semi-transparent semi-reflecting lens, two catoptrons and two polaroids are formed, first semi-transparent semi-reflecting lens, second semi-transparent semi-reflecting lens and first catoptron, first catoptron placed according to Michelson-interferometer mode, first transmission-type liquid crystal spatial light regulator, second transmission-type liquid crystal spatial light regulator is placed on two arms of Michelson-interferometer respectively, semi-transparent semi-reflecting A1-A2 of first transmission-type liquid crystal spatial light regulator and second semi-transparent semi-reflecting lens in angle of 45 degrees, second transmission-type liquid crystal spatial light regulator and first transmission-type liquid crystal spatial light regulator are the mirror image symmetry with respect to semi-transparent semi-reflecting A1-A2 of second semi-transparent semi-reflecting lens and place, make first transmission-type liquid crystal spatial light regulator, the pixel of second transmission-type liquid crystal spatial light regulator is aimed at one by one, first polaroid and second polaroid are parallel to first transmission-type liquid crystal spatial light regulator respectively, second transmission-type liquid crystal spatial light regulator, first polaroid and second polaroid lay respectively at the light inlet and the light-emitting window of Michelson-interferometer, select the polarization direction of first polaroid and second polaroid, make first transmission-type liquid crystal spatial light regulator, second transmission-type liquid crystal spatial light regulator all works in the position and is adjusted to holotype mutually.

Described a kind of device of realizing digital optical phase conjugation, it is characterized in that: described complex amplitude spatial light modulator is by a transmission-type liquid crystal spatial light regulator, one blocks of reflecting liquid crystal grating, two polaroids and digit optical disposal system are formed, first polaroid, transmission-type liquid crystal spatial light regulator, second polaroid and reflection type liquid crystal grating are placed successively, the digit optical disposal system is placed on the back of reflection type liquid crystal grating, one width of cloth optical image is imaged onto the back side of reflection type liquid crystal grating, the pixel of this optical image is aimed at one by one with the pixel of transmission-type liquid crystal spatial light regulator, adjust first polaroid, the polarization direction of second polaroid, make transmission-type liquid crystal spatial light regulator and reflection type liquid crystal grating work in the position respectively and be adjusted to holotype mutually and amplitude is adjusted to holotype, the illumination coherent light is from the front end incident of adiabatic taper optical waveguide bundle, and from the terminal outgoing of adiabatic taper optical waveguide bundle, project the complex amplitude spatial light modulator through coupling mechanism then, after complex amplitude spatial light modulator reflection once more through the reverse end that enters adiabatic taper optical waveguide bundle of coupling mechanism coupling.

Described a kind of device of realizing digital optical phase conjugation, it is characterized in that: described complex amplitude spatial light modulator is by a transmission-type liquid crystal spatial light regulator, one blocks of reflecting liquid crystal grating, two polaroids and digit optical disposal system are formed, first polaroid, transmission-type liquid crystal spatial light regulator, second polaroid and reflection type liquid crystal grating are placed successively, the digit optical disposal system is placed on the back of reflection type liquid crystal grating, one width of cloth optical image is imaged onto the back side of reflection type liquid crystal grating, the pixel of this optical image is aimed at one by one with the pixel of transmission-type liquid crystal spatial light regulator, adjust first polaroid, the polarization direction of second polaroid, make transmission-type liquid crystal spatial light regulator and reflection type liquid crystal grating work in the position respectively and be adjusted to holotype mutually and amplitude is adjusted to holotype, the illumination coherent light is from the front end incident of adiabatic taper optical waveguide bundle, and from the terminal outgoing of adiabatic taper optical waveguide bundle, project the complex amplitude spatial light modulator through coupling mechanism, after complex amplitude spatial light modulator reflection once more through the reverse end that enters adiabatic taper optical waveguide bundle of coupling mechanism coupling.

Described a kind of device of realizing digital optical phase conjugation, it is characterized in that: described complex amplitude spatial light modulator is by a transmission-type liquid crystal spatial light regulator, one blocks of reflecting LCOS LCD space light modulator, two polaroids and digit optical disposal system are formed, first polaroid, transmission-type liquid crystal spatial light regulator, second polaroid and reflective LCOS LCD space light modulator are placed successively, the pixel of transmission-type liquid crystal spatial light regulator and the pixel of reflective LCOS LCD space light modulator with aim at one by one, adjust first polaroid, the polarization direction of second polaroid, make transmission-type liquid crystal spatial light regulator and reflective LCOS LCD space light modulator work in the position respectively and be adjusted to holotype mutually and amplitude is adjusted to holotype, the illumination coherent light is from the front end incident of adiabatic taper optical waveguide bundle, and from the terminal outgoing of adiabatic taper optical waveguide bundle, project the complex amplitude spatial light modulator through coupling mechanism then, after complex amplitude spatial light modulator reflection once more through the reverse end that enters adiabatic taper optical waveguide bundle of coupling mechanism coupling.

Described a kind of device of realizing digital optical phase conjugation, it is characterized in that: described coupling mechanism is made up of a microlens array and a light barrier, microlens array one side is close to the complex amplitude spatial light modulator and is placed, the focal plane of opposite side overlaps with the distal end faces of adiabatic taper optical waveguide bundle, each lenticular focal length and clear aperture make and converge to the critical angle of incidence of the incident angle of the light on the distal end faces of adiabatic taper optical waveguide bundle less than the monomode optical waveguide of the end of adiabatic taper optical waveguide bundle through each lenticule on the microlens array on the design microlens array, light barrier is close to the end of adiabatic taper optical waveguide bundle and is placed, be manufactured with the light hole array on the light barrier, light hole on the light barrier is aimed at one by one with the sandwich layer of the monomode optical waveguide of the end of adiabatic taper optical waveguide bundle, the diameter of light hole is consistent with the diameter of the sandwich layer of the monomode optical waveguide of adiabatic taper optical waveguide bundle end, lenticule on the microlens array is aimed at one by one with the pixel on the complex amplitude spatial light modulator, make each pixel is sent on the complex amplitude spatial light modulator light after lenticule focuses on, pass the light hole on the light barrier, accurately focus in the sandwich layer of each monomode optical waveguide of adiabatic taper optical waveguide bundle end.

Described a kind of device of realizing digital optical phase conjugation, it is characterized in that: described coupling mechanism is by an optical lens, a compound microlens-microprism array and a light barrier are formed, each compound microlens-microprism on compound microlens-microprism array is made up of a binary optical elements or holographic optical elements (HOE), the function of each compound microlens-microprism is equivalent to the combination of a lenticule and a microprism, the image planes of compound microlens-microprism array overlap with the distal end faces of adiabatic taper optical waveguide bundle, the focal length of each the compound microlens-microprism on design compound microlens-microprism array, clear aperture and prism inclination angle make and to converge to the critical angle of incidence of the incident angle of the light on the distal end faces of adiabatic taper optical waveguide bundle less than the monomode optical waveguide of adiabatic taper optical waveguide bundle end through each the compound microlens-microprism on compound microlens-microprism array, light barrier is close to the end of adiabatic taper optical waveguide bundle and is placed, be manufactured with the light hole array on the light barrier, light hole on the light barrier is aimed at one by one with the sandwich layer of the monomode optical waveguide of adiabatic taper optical waveguide bundle end, the diameter of light hole is consistent with the diameter of the sandwich layer of the monomode optical waveguide of adiabatic taper optical waveguide bundle end, regulate the position of optical lens, make the complex amplitude spatial light modulator be positioned at the object plane of optical lens, and the object plane of compound microlens-microprism array is positioned at the image planes of optical lens, each compound microlens-microprism on compound microlens-microprism array is aimed at one by one with each pixel on the complex amplitude spatial light modulator, make light that each pixel of complex amplitude spatial light modulator sends after each compound microlens on compound microlens-microprism array-microprism focuses on, pass the light hole on the light barrier, converge in the sandwich layer of each monomode optical waveguide of adiabatic taper optical waveguide bundle end.

Described a kind of device of realizing digital optical phase conjugation, it is characterized in that: a described transmission-type optical lens or the reflective optic camera lens of comprising, the clear aperture of transmission-type optical lens or reflective optic camera lens is greater than the diameter of the front end of adiabatic taper optical waveguide bundle, and be placed on the front of adiabatic taper optical waveguide bundle front end, aim at the front end of adiabatic taper optical waveguide bundle, make the optical axis of transmission-type optical lens or reflective optic camera lens overlap with the central shaft of adiabatic taper optical waveguide bundle.

Described a kind of device of realizing digital optical phase conjugation, it is characterized in that: described lamp optical system comprises a branch of input optical fibre, input optical fibre is used for the front end of the adiabatic taper optical waveguide bundle of illumination coherent light coupling input around the front edge place of the lateral surface or the front end of the front end that is fixed on adiabatic taper optical waveguide bundle.

Described a kind of device of realizing digital optical phase conjugation, it is characterized in that: described adiabatic taper optical waveguide bundle dish becomes the circle of certain radius, the radius of control circle makes the high-order mode that excites in every monomode optical waveguide from the light of the terminal incident of adiabatic taper optical waveguide bundle reveal away from the side of adiabatic taper optical waveguide bundle, guarantees that simultaneously the basic mode that excites in the every monomode optical waveguide of adiabatic taper optical waveguide bundle end goes out from the positive transmission of the front end of adiabatic taper optical waveguide bundle.

Used term explanation in this instructions: (1), adiabatic taper optical waveguide bundle: refer in particular to the conical optical waveguide bundle of forming by many monomode optical waveguides, lateral separation between the sandwich layer of these monomode optical waveguides of front end of conical optical waveguide bundle is very little, coupling mutually, progressively separate then, up at end at the conical optical waveguide bundle, sandwich layer coupling each other can be ignored, the cone angle of above-mentioned conical optical waveguide bundle is less relatively simultaneously, be that lateral separation between the adjacent monomode optical waveguide sandwich layer slowly increases, make light wave in reflection that this conical optical waveguide is intrafascicular not to be produced radiation mode and caused by mutation structure when propagating.(2), complex amplitude spatial light modulator: the complex amplitude spatial light modulator refers to carry out mutually the amplitude of optical wavefront and position the device of independent regulation.Single conventional spatial light modulator, as spatial light modulator based on the TFT liquid crystal board, often can only regulate mutually the amplitude or the position of optical wavefront, perhaps when amplitude is regulated, cause phase change relatedly, or when contraposition is regulated mutually, cause amplitude variations relatedly, can't be adjusted to predetermined value to the amplitude of optical wavefront when identical with the position in a word.Have only two conventional spatial light modulators combine could to the amplitude of optical wavefront and position mutually pointwise independently regulate mutually simultaneously, this instructions calls the complex amplitude spatial light modulator to this amplitude that can carry out simultaneously with the combined type spatial light modulator of independent regulation mutually.

Inventive principle: invention (ZL200610124657.4) is described in detail the principle of the active optics phase conjugate method of its proposition, its core concept is by any complicated incident light wave decomposition of specific light waveguiding structure handle and is directed in the monomode optical waveguide that is isolated from each other, thereby in the monomode optical waveguide that each root is isolated from each other, produce and have certain amplitude and position basic mode light field mutually, then by illumination light wave amplitude and position are carried out the digitizing regulation and control mutually, in these monomode optical waveguides, reconstruct the conjugation light wave that has the optical phase conjugation relation with these basic mode light fields again, these conjugation light waves can synthesize structure again and go out and the consistent light wave of original incident light wave shape along the reverse propagation of same optical waveguide structure.The effect of above-mentioned specific light waveguiding structure is that on the one hand incident light wave is carried out pattern to be separated, and is on the other hand the conjugation light wave of reverse propagation is synthesized, and therefore is called as pattern and separates/synthetic converter in invention (ZL200610124657.4).Pattern separates/and synthetic converter is made up of various monomode optical waveguides, and these monomode optical waveguides are very little in the front end lateral separation, are coupled mutually, progressively separate then, can ignore up to each other coupling endways.From shape and structure, a pattern is separated/is synthesized converter and is equivalent to a conical optical waveguide bundle of being made up of many monomode optical waveguides, it also should be an adiabatic taper optical waveguide bundle simultaneously, because the theoretical derivation from invention (ZL200610124657.4) as can be seen, realize accurate optical phase conjugation, light wave can not the exciting radiation mould when the intrafascicular propagation of conical optical waveguide, and reflection can be ignored.In case exciting radiation mould or generation reflection, these radiation modes or reflected light can be taken away part energy, cause that simultaneously the luminous energy between the different guided modes is redistributed, and cause the distortion of structure optical wavefront again.That is to say that the conical optical waveguide Shu Bixu that is applicable to pattern separation/synthetic converter adopts insulated design, promptly cone angle must be suitably, and the lateral separation between the monomode optical waveguide sandwich layer should slowly increase, to avoid producing the reflection of radiation mode and mutation structure generation.Conical optical waveguide is a technical term commonly used, therefore in this manual the pattern in the invention (ZL200610124657.4) is separated/synthesizes converter and rename as adiabatic taper optical waveguide bundle.

The above-mentioned principle of foundation realizes that the device of digital optical phase conjugation should comprise four parts at least, i.e. lamp optical system, complex amplitude spatial light modulator, coupling mechanism and adiabatic taper optical waveguide bundle.At first need to adopt the complex amplitude spatial light modulator that the amplitude of illumination light is regulated by pixel mutually with the position, secondly need be coupled to the light wave after the modulation in the monomode optical waveguide that is isolated from each other of adiabatic taper optical waveguide bundle end by coupling mechanism, thereby in these monomode optical waveguides, produce particular amplitude and position conjugation light wave mutually, these conjugation light waves are reverse by adiabatic taper optical waveguide bundle, thereby realize optical wavefront reconstruct.The embodiment that invention (ZL200610124657.4) provides is very limited.The present invention will provide more complex amplitude spatial light modulator embodiment, also will carry out perfect simultaneously to the structure of coupling mechanism and the shape of adiabatic taper optical waveguide bundle, thereby suppress the radiation mode in the adiabatic taper optical waveguide bundle, in addition also with the preposition optical system of interpolation, further improve the quality of reconstruct optical wavefront, and will change the structure of lamp optical system, to adapt with the complex amplitude spatial light modulator that is adopted.To the functional structure of complex amplitude spatial light modulator, coupling mechanism, adiabatic taper optical waveguide bundle, preposition optical system and lamp optical system be described one by one below.

One, complex amplitude spatial light modulator: the function of complex amplitude spatial light modulator is that the amplitude of coherent light that lamp optical system is sent regulates by pixel mutually with the position.Various transmissive type liquid crystal displays have appearred at present on the market, as the TFT-ST LCD, and reflective liquid-crystal display, as LCOS (Liquid Cristal On Silicon) LCD, liquid crystal grating etc.These liquid crystal display devices are as regular display the time, mainly carry out intensity adjustments, promptly, see through light or catoptrical intensity thereby change by the transmitance or the reflectivity of each pixel of numeral regulation and control, demonstrate two dimensional image, this moment, they were equivalent to intensity adjustments type liquid crystal spatial light regulator.Studies show that, to monolithic TFT-ST, LCOS, liquid crystal grating, and the LCD of some other types, also can be by adjusting the polaroid of its both sides, front and back, make its work holotype that is adjusted to mutually on the throne, be used for the position regulation and control mutually of optical wavefront, this moment, they were equivalent to a phase adjustment type liquid crystal spatial light regulator.Regulate the amplitude of input light wave and position if desired simultaneously mutually, then need two liquid crystal spatial light regulators are combined by rights, to realize amplitude independent regulation with mutually the time.A kind of combined method is to make illumination light successively by two liquid crystal spatial light regulators, and at this moment total complex amplitude regulated quantity equals the product of the complex amplitude regulated quantity of every liquid crystal spatial light regulator.Another combined method is that two liquid crystal spatial light regulators are placed on respectively in two arms of Michelson-interferometer, make illumination light respectively by two liquid crystal spatial light regulators, be synthesized together again, this moment total complex amplitude regulated quantity equal every liquid crystal spatial light regulator the complex amplitude regulated quantity vector and.The liquid crystal spatial light regulator that we carry out independent regulation during this combine can be to the amplitude of light wave identical with the position is referred to as the complex amplitude spatial light modulator.For example can be serially connected two transmission-type liquid crystal spatial light regulators and form transmission-type complex amplitude spatial light modulator, perhaps a transmission-type liquid crystal spatial light regulator and a blocks of reflecting LCOS or liquid crystal grating liquid crystal spatial light regulator are serially connected and form reflective complex amplitude spatial light modulator, constitute the complex amplitude spatial light modulator again or two transmission-type liquid crystal spatial light regulators are combined according to the mode of Michelson-interferometer, or the like.

Two, coupling mechanism: the function of coupling mechanism is in the sandwich layer of the monomode optical waveguide that accurately converges to adiabatic taper optical waveguide bundle end through the light wave after each pixel adjustment of complex amplitude spatial light modulator.When the spatial disposition cycle of the pixel of complex amplitude spatial light modulator equated fully with the spatial disposition cycle of the sandwich layer of the monomode optical waveguide of adiabatic taper optical waveguide bundle end, the light that can directly send each pixel of complex amplitude spatial light modulator with a microlens array converged in the sandwich layer of each monomode optical waveguide of adiabatic taper optical waveguide bundle end one by one exactly.For fear of exciting the high-order radiation mode, should design lenticular focal length and clear aperture, make the incident angle of the light wave converge to adiabatic taper optical waveguide bundle end less than the critical angle of incidence of monomode optical waveguide.Simultaneously for fear of influence owing to manufacturing and rigging error, can before adiabatic taper optical waveguide bundle end, increase a light barrier, be manufactured with light hole on the light barrier, the diameter of light hole is consistent with the sandwich layer diameter of the monomode optical waveguide of adiabatic taper optical waveguide bundle end, and aim at the sandwich layer of monomode optical waveguide is strict, light wave can only converge the sandwich layer that enters monomode optical waveguide like this, can't enter covering, thereby suppressed the generation of high-order mode, and the spuious ground unrest that causes thus, improved the quality of reconstruct optical wavefront.When the spatial disposition cycle of the sandwich layer of the monomode optical waveguide of spatial disposition cycle of the pixel of complex amplitude spatial light modulator and adiabatic taper optical waveguide bundle end is unequal, can be earlier each pixel of complex amplitude spatial light modulator be imaged onto each lenticular object plane of microlens array, further the luminous energy imaging be converged in the sandwich layer of each monomode optical waveguide of adiabatic taper optical waveguide bundle end by these lenticules with an optical lens.Can realize the coupling of size of the end of the size of complex amplitude spatial light modulator and adiabatic taper optical waveguide bundle by optical lens, but also bring a problem, promptly by after the optical lens imaging, arrive image planes, promptly arrive only tilting of lenticule object plane, and the inclination angle changes along with location of pixels, and from the center to the edge, the inclination angle progressively increases.In order to correct this inclination, can be in each lenticule front or the back increase a microprism.After we knew that a branch of light is through a prism, its direction of propagation will change, and the corner angle difference, and the change amount of the direction of propagation is also different.If from the center to the edge, microprism is got different corner angle, just can compensate above-mentioned inclination angle and change, make the light that converges through lenticule always symmetrically normal incidence to the end of adiabatic taper optical waveguide bundle, and less than the critical angle of incidence of the monomode optical waveguide of end.Combinations thereof lenticule-microprism can adopt binary optical or holographic optics method to manufacture and design, because these two kinds of methods can be produced on a plurality of optical element combination in the single device, but consider from diffraction efficiency, adopt binary optical elements more better.

Three, adiabatic taper optical waveguide bundle: the function of adiabatic taper optical waveguide bundle is divided into two aspects, an aspect is the basic mode that complicated incident light is decomposed into many monomode optical waveguides, be synthetic on the one hand, reconstruct original incident light the conjugation light wave that produces through the complex amplitude spatial light modulation in the monomode optical waveguide.No matter be decomposition or synthetic,, all require conical optical waveguide Shu Caiyong insulated design, avoid producing high-order radiation mode and reflection in order accurately to recover original incident light wave.Even but for the adiabatic taper optical waveguide bundle of an appropriate design; in use; because miscellaneous part assembling alignment error; or factor such as external parasitic light; light may not be the critical angle of incidence that all surpasses monomode optical waveguide from sandwich layer incident or incident angle; all can excite high-order mode in these cases, these high-order modes can form stray wave, influence the quality of structure light wave again.In order to eliminate these high-order modes, can turn adiabatic taper optical waveguide bundle, but the radius of circle is suitable, on the one hand to guarantee high-order mode is revealed away from the side of adiabatic taper optical waveguide bundle in advance, not allow them from the front end outgoing of adiabatic taper optical waveguide bundle, generation ground unrest, guarantee again that on the other hand basic mode can not reveal, continuation is propagated along optical waveguide, launches until the front end front from adiabatic conical optical waveguide, realizes accurate optical wavefront reconstruct.

Four, preposition optical system: the function of preposition optical system is further to promote the optical property of whole device.Do not have the aberration of ordinary optical system based on the imaging device of optical phase conjugation principle, its resolution depends on the diffraction resolving limit.If the front end in adiabatic taper optical waveguide bundle is placed an optical system, for example optical lens or catoptron can increase the entrance pupil diameter, thereby improve the diffraction resolution of whole device.Can also be amplified in the 3 D stereo picture of the front end generation of adiabatic taper optical waveguide bundle in addition by this preposition optical system, in order to obtain enough big stereo-picture size, preposition optical system can adopt a plurality of eyeglasses, obtains enough big enlargement ratio by multistage amplification.In order to compensate the aberration of preposition optical system, when incident light being decomposed with adiabatic taper optical waveguide bundle, preposition optical system also must be in place, in the sandwich layer of the monomode optical waveguide of adiabatic taper optical waveguide bundle end, decompose the aberration effects that the basic mode that obtains has just comprised preposition optical system like this, when rebuilding by the conjugation method, the aberration of preposition optical system will be eliminated automatically.

Five, lamp optical system: the function of lamp optical system is to provide the coherence who satisfies system requirements good laser beam.When adopting transmission-type complex amplitude spatial light modulator, lamp optical system only needs the even collimated laser beam of formation behind the laser beam expanding, and vertical illumination transmission-type complex amplitude spatial light modulator gets final product.When adopting reflective complex amplitude spatial light modulator, lamp optical system need import the front end of laser from adiabatic taper optical waveguide bundle.A kind of lead-in mode is to adopt oblique incidence that laser is imported the front end of adiabatic taper optical waveguide bundle, can avoid lamp optical system to block from the light wave of structure again of adiabatic taper optical waveguide bundle front end outgoing like this.Another kind of lead-in mode is the front end that the laser illuminator coupling is imported adiabatic taper optical waveguide bundle by optical fiber, these optical fiber can be around being fixed on the adiabatic taper optical waveguide bundle front end outside or front end front edge, and the other end of optical fiber is also can bonding one-tenth a branch of, and, be convenient to import laser the end face optical polish.

Compare with invention (ZL200610124657.4), the present invention provides more embodiments by introducing above-mentioned complex amplitude spatial light modulator, make the light after the complex amplitude spatial light modulator is regulated accurately converge in the monomode optical waveguide sandwich layer of adiabatic taper optical waveguide bundle end by the structure of optimizing coupling mechanism, effectively suppressed the generation of high-order radiation mode, simultaneously by changing the shape of adiabatic taper optical waveguide bundle, further reduced the influence of high-order radiation mode, also by introducing the quality that preposition optical system has further improved the reconstruct optical wavefront, increased the size of three-dimensional image in addition.

Description of drawings

When having provided the transmission-type liquid crystal spatial light regulator that adopts two serial connections, realizes Fig. 1 the embodiment synoptic diagram of the device of digital optical phase conjugation.

When having provided employing compound microlens-microprism array as coupling mechanism, realizes Fig. 2 the embodiment synoptic diagram of the device of digital optical phase conjugation.

Fig. 3 has provided the embodiment synoptic diagram of realizing the device of digital optical phase conjugation when adopting two transmission-type liquid crystal spatial light regulators of placing according to the inferior interferometer mode of Mike's ear.

Fig. 4 has provided the embodiment synoptic diagram of realizing the device of digital optical phase conjugation when adopting a transmission-type liquid crystal spatial light regulator and a reflection type liquid crystal grating.

Fig. 5 has provided the embodiment synoptic diagram of realizing the device of digital optical phase conjugation when adopting the reflective LCOS spatial light modulator of a transmission-type liquid crystal spatial light regulator and.

Fig. 6 has provided the structural representation of adiabatic taper optical waveguide bundle when one has additional illumination light input waveguide.

Embodiment

Fig. 1 has provided the transmission-type liquid crystal spatial light regulator that adopts two serial connections and has formed composite space light regulator, the structural representation of the device of the realization digital optical phase conjugation of being built.As can be seen from Figure 1, it is mainly by lamp optical system 1, complex amplitude spatial light modulator 2, coupling mechanism 3 and adiabatic taper optical waveguide bundle 4 are formed, from right to left, lighting source 1, complex amplitude spatial light modulator 2, coupling mechanism 3 and adiabatic taper optical waveguide bundle 4 are placed successively, they are aimed at mutually, make the collimated laser beam that sends from the lamp optical system 1 transmission-type complex amplitude spatial light modulator 2 that evenly throws light on like this, undertaken after suitable amplitude and position regulate mutually by complex amplitude spatial light modulator 2, be coupled into adiabatic taper optical waveguide bundle 4 ends through coupling mechanism 3 again, and luminous energy is converged in each monomode optical waveguide sandwich layer of adiabatic taper optical waveguide bundle 4 ends, generation has particular amplitude and position conjugation light wave mutually.

In the device of Fig. 1, also comprise a transmission-type optical lens 5, its role is to increase the entrance pupil bore of system, thereby improve the imaging resolution of system, so its clear aperture is much larger than the diameter of adiabatic taper optical waveguide bundle 4 front ends.It is placed on the front of adiabatic taper optical waveguide bundle 4 front ends, aims at the front end of adiabatic taper optical waveguide bundle 4, makes the optical axis of transmission-type optical lens 5 overlap with the central shaft of adiabatic taper optical waveguide bundle 4.The effect of transmission-type optical lens 5 also is space image is amplified.Because the diameter of adiabatic taper optical waveguide bundle 4 front ends is very little, often less than 1mm, therefore the size of the 3 D stereo picture of rebuilding at adiabatic taper optical waveguide bundle 4 front ends is also very little, may need to amplify hundreds of, even several thousand times, in order to obtain so big magnification, can adopt the multi-disc optical lens to carry out multistage amplification.

Adiabatic taper optical waveguide bundle 4 is formed (the optical waveguide cladding structure does not clearly draw among the figure) by many monomode optical waveguides 16 in Fig. 1, from the left side front end of adiabatic taper optical waveguide bundle 4 to right end, interval between the sandwich layer of adjacent two one optical waveguides progressively increases, optical coupled each other progressively weakens to ignoring, simultaneously because the cone angle of adiabatic taper optical waveguide bundle 4 is less relatively, its structural parameters make when light wave is propagated in adiabatic taper optical waveguide bundle 4 the radiation mode that produces and can ignore by the reflection that mutation structure causes, satisfy reversibility of optical path and propagate requirement, can realize optical wavefront reconstruct and three-dimensional imaging based on the reversibility of optical path principle.For example when needs disperse three-dimensional imaging, we can be placed on a true three-dimension pixel front of optical lens 5 among Fig. 1 in calibration phase, the light that is sent by this voxel converges the front end that enters adiabatic taper optical waveguide bundle 4 through optical lens 5, when these light propagate into adiabatic taper optical waveguide bundle 4 terminal, can produce particular amplitude and position basic mode light field mutually in the monomode optical waveguide sandwich layer that is isolated from each other, we can introduce reference light the amplitude and the phase measurement of the basic mode light field in the every monomode optical waveguide are noted.In the 3-D display stage, according to the optical conjugate principle, can in the monomode optical waveguide sandwich layer that is isolated from each other, can rebuild above-mentioned conjugation light field by complex amplitude spatial light modulator 2 with particular amplitude and position basic mode light field mutually, because the reversibility of light path, the reverse propagation of these conjugation light fields meetings, recover original voxel, and various similar discrete voxel just can be formed a width of cloth stereo-picture 17.

In Fig. 1, complex amplitude spatial light modulator 2 is by two transmission-type liquid crystal

spatial light regulators

9,10 and three polaroids 11,12,13 form, from right to left, first polaroid 13, first transmission-type liquid crystal board 10, second polaroid 12, second transmission-type liquid crystal board 9 and the 3rd polaroid 11 are close to placement successively, two transmission-type

liquid crystal boards

9,10 pixel is aimed at one by one, regulate three polaroids 11,12,13 polarization direction, for example allow the polarization direction of first polaroid 13 and second polaroid 12 be mutually 90 degree, and the polarization direction of second polaroid 12 and the 3rd polaroid 11 is mutually 45 degree, thereby make the piece transmission-type liquid crystal spatial light regulator 10 of winning work in amplitude and be adjusted to holotype, and second transmission-type liquid crystal spatial light regulator 9 works in the position and is adjusted to holotype (noting may needing to adopt different polarization angles to different model liquid crystal spatial light regulator) mutually, so just can accurately control when identical the amplitude of incident illumination coherent light.Because illumination light is in succession by two liquid crystal spatial light regulators, total complex amplitude regulated quantity is the product of the complex amplitude regulated quantity of two liquid crystal spatial light regulators, therefore which piece liquid crystal spatial light regulator carries out the amplitude adjusting on earth, which piece liquid crystal spatial light regulator carries out the position regulates mutually, and its sequence independence is critical.If the illumination coherent laser is a polarized light in addition, can adjust its yawing moment, make it consistent with the polarization direction of first polaroid 13, such first polaroid 13 just can omit simplified structure.

In Fig. 1, coupling mechanism 3 is made up of a microlens array 14 and a light barrier 15, microlens array 14 right sides are close to complex amplitude spatial light modulator 2 and are placed, and the focal plane in left side overlaps with the distal end faces of adiabatic taper optical waveguide bundle 4, each lenticular focal length and clear aperture can guarantee to converge to the critical angle of incidence of the incident angle of the light on adiabatic taper optical waveguide bundle 4 distal end faces less than the monomode optical waveguide of adiabatic taper optical waveguide bundle 4 ends through each lenticule on the microlens array 14 through appropriate design on the microlens array 14.Light barrier 15 is close to the end of adiabatic taper optical waveguide bundle 4 and is placed, be manufactured with the light hole array on the light barrier 15, light hole on the light barrier 15 is aimed at one by one with the sandwich layer of the monomode optical waveguide of adiabatic taper optical waveguide bundle 4 ends, the diameter of light hole is consistent with the diameter of the sandwich layer of adiabatic taper optical waveguide bundle 4 terminal monomode optical waveguides, lenticule on the microlens array 14 is aimed at one by one with the pixel on the complex amplitude spatial light modulator 2, make each pixel is sent on the complex amplitude spatial light modulator 2 light like this after lenticule focuses on, pass the light hole on the light barrier 15, accurately focus in the sandwich layer of each monomode optical waveguide of adiabatic taper optical waveguide bundle 4 ends.

The purpose that adopts light barrier 15 is for fear of because processing and rigging error cause luminous energy to converge to the sandwich layer outside of monomode optical waveguide, excites the high-order radiation mode, forms ground unrest, causes the distortion of rebuilding light wave.Even but adopted light barrier can not definitely guarantee can not excite the high-order radiation mode, in order to suppress the high-order radiation mode to greatest extent, can coil into the circle of certain radius to adiabatic taper optical waveguide bundle 4, the radius of control circle makes the high-order mode that excites in the every monomode optical waveguide of adiabatic taper optical waveguide bundle 4 ends reveal away in advance from the side of adiabatic taper optical waveguide bundle 4, guarantee that simultaneously the basic mode that excites in the every monomode optical waveguide of adiabatic taper optical waveguide bundle 4 ends is unaffected, continuation is along adiabatic taper optical waveguide bundle 4 reverse propagation, and goes out from the positive transmission of front end.

When the sandwich layer of the monomode optical waveguide of the pixel of spatial light modulator and adiabatic taper optical waveguide bundle end has same steric structure, adopt the coupling mechanism shown in Figure 1 can be easily focusing on one by one in the sandwich layer of each monomode optical waveguide of being coupled to adiabatic taper optical waveguide bundle end through the light wave after each pixel adjustment of spatial light modulator.And when the sandwich layer of the pixel of spatial light modulator and the monomode optical waveguide of adiabatic taper optical waveguide bundle end has different steric structures, can adopt an optical lens that the size of spatial light modulator is carried out conversion, concrete structure is as shown in Figure 2.

In Fig. 2, coupling mechanism 3 is made up of an optical lens 19, a compound microlens-microprism array 18 and a light barrier 15, each compound microlens-microprism on compound microlens-microprism array 18 is made up of a binary optical elements or holographic optical elements (HOE), and its function is equivalent to the combination of a lenticule and a microprism.The image planes of compound microlens-microprism array 14 overlap with the distal end faces of adiabatic taper optical waveguide bundle 4, by focal length, clear aperture and the prism inclination angle of each the compound microlens-microprism on appropriate design compound microlens-microprism array 14, can guarantee to converge to the critical angle of incidence of the incident angle of the light on adiabatic taper optical waveguide bundle 4 distal end faces less than the monomode optical waveguide of adiabatic taper optical waveguide bundle 4 ends through each the compound microlens-microprism on compound microlens-microprism array 14.Light barrier 15 is close to the end of adiabatic taper optical waveguide bundle 4 and is placed, be manufactured with the light hole array on the light barrier 15, light hole on the light barrier 15 is aimed at one by one with the sandwich layer of the monomode optical waveguide of adiabatic taper optical waveguide bundle 4 ends, and the diameter of light hole is consistent with the diameter of the sandwich layer of the monomode optical waveguide of the end of adiabatic taper optical waveguide bundle 4.The focal length of choose reasonable optical lens 19 and position, can guarantee that complex amplitude spatial light modulator 2 is positioned at the object plane of optical lens 19, and the object plane of compound microlens-microprism array 18 is positioned at the image planes of optical lens 19, and each the compound microlens-microprism on compound microlens-microprism array 18 is aimed at one by one with each pixel on the complex amplitude spatial light modulator 2, make light that each pixel of complex amplitude spatial light modulator 2 sends after each compound microlens on compound microlens-microprism array 18-microprism focuses on, pass the light hole on the light barrier 15, converge in the sandwich layer of each monomode optical waveguide of adiabatic taper optical waveguide bundle 4 ends.

In Fig. 2, owing to adopt optical lens 19 complex amplitude spatial light modulator 2 to be imaged onto the object plane of compound microlens-microprism array 18, the incident angle of the light on the surface of arrival compound microlens-microprism array 18 is stepping from the center of whole compound microlens-microprism array 18 to the edge, at the center near vertical incidence, and it is bigger at the inclination angle, edge, the structural parameters that need each the compound microlens-microprism on design compound microlens-microprism array 18 this moment, be equivalent to make the inclination angle of the microprism in each compound microlens-microprism to change, correct the variation of the incident angle that compensates the light that arrives compound microlens array 18 surfaces, make the light that each pixel of complex amplitude spatial light modulator 2 is sent, still be the light that the pixel of fringe region is sent no matter from the pixel of central area, after compound microlens-microprism array 18 focuses on, can both pass the light hole on the light barrier 15, accurately focus in the sandwich layer of each monomode optical waveguide of end of adiabatic taper optical waveguide bundle 4, and incident angle is less than the critical angle of incidence of monomode optical waveguide.

Fig. 3 has provided and has adopted two transmission-type liquid crystal spatial light regulators of placing according to the inferior interferometer mode of Mike's ear to form composite space light regulator, the structural representation of the device of the realization digital optical phase conjugation of being built.In Fig. 3, complex amplitude spatial light modulator 2 is made up of 22,23 and two

polaroids

26,27 of 20,21, two catoptrons of 24,25, two semi-transparent semi-reflecting lens of two transmission-type liquid crystal spatial light regulators.Two semi-transparent

semi-reflecting lens

20,21 and two

catoptrons

22,23 place according to Michelson-interferometer mode, two transmission-type liquid crystal

spatial light regulators

24,25 are placed on respectively in two arms of Michelson-interferometer, semi-transparent semi-reflecting A1-A2 of first transmission-type liquid crystal spatial light regulator 24 and second semi-transparent semi-reflecting lens 21 in angle of 45 degrees, second transmission-type liquid crystal spatial light regulator 25 and first transmission-type liquid crystal spatial light regulator 24 are the mirror image symmetry with respect to semi-transparent semi-reflecting A1-A2 of second semi-transparent semi-reflecting lens 21 and place, make two transmission-type liquid crystal

spatial light regulators

24,25 pixel is aimed at one by one, two

polaroids

26,27 are parallel to two transmission-type liquid crystal spatial light regulators 24 respectively, 25, first polaroid 26 is placed on the light inlet of Michelson-interferometer, second polaroid 27 is placed on the light-emitting window of Michelson-interferometer, first polaroid 26 is mutually 45 degree (noting may needing to adopt different polarization angles to different model liquid crystal spatial light regulator) with the polarization direction of second polaroid 27, makes two transmission-type liquid crystal

spatial light regulators

24,25 all work in the position is adjusted to holotype mutually.The coherent parallel lights ripple that illumination coherent source 1 sends at first passes first polaroid 26, become linearly polarized photon, then be divided into two-beam by first semi-transparent semi-reflecting lens 20, this two-beam is respectively by 22,23 reflections of two catoptrons, vertically pass two transmission-type liquid crystal

spatial light regulators

24,25, after passing second semi-transparent semi-reflecting lens 21 and second polaroid 27 again, be coupled into the end of adiabatic taper optical waveguide bundle 4 by coupling mechanism 3.Because two transmission-type liquid crystal

spatial light regulators

24,25 are mutually mirror, and all be positioned at the object plane of optical lens 19, through two transmission-type liquid crystal

spatial light regulators

24,25 carry out the position mutually the light wave after the modulation be imaged onto the object plane of compound microlens array 18, further converged in the sandwich layer of every monomode optical waveguide of adiabatic taper optical waveguide bundle 4 ends, produce certain bits mutually and the conjugation light wave of amplitude by coherence stack by the compound microlens array image-forming.

In Fig. 3, also comprise a mirror condenser 28, its role is to increase the entrance pupil bore of system, the imaging resolution of raising system, its fixed placement is at the front end of adiabatic taper optical waveguide bundle 4, and aim at front end, make the optical axis of mirror condenser 28 and the optical axis coincidence of adiabatic taper optical waveguide bundle 4.

Fig. 4 has provided and has adopted a transmission-type liquid crystal spatial light regulator and a liquid crystal grating to form composite space light regulator, the structural representation of the device of the realization digital optical phase conjugation of being built.In Fig. 4, complex amplitude spatial light modulator 2 is made up of a transmission-type liquid crystal spatial light regulator 29, a blocks of reflecting liquid crystal grating 30 and two

polaroids

31,32 and digit optical disposal system 33.From left to right, first polaroid 31, transmission-type liquid crystal spatial light regulator 29, second polaroid 32 and reflection type liquid crystal grating 30 are close to placement successively.Digit optical disposal system (Digital Light Processing, DLP) 33 back that are placed on reflection type liquid crystal grating 30, one width of cloth optical image is imaged onto the back side of reflection type liquid crystal grating 30, the pixel of this optical image is aimed at one by one with the pixel of transmission-type liquid crystal spatial light regulator 29, two

polaroids

31,32 polarization direction is mutually 45 degree (noting may needing to adopt different polarization angles to different model liquid crystal spatial light regulator), make transmission-type liquid crystal spatial light regulator 29 work in the position and be adjusted to holotype mutually, and reflection type liquid crystal grating 30 works in amplitude and is adjusted to holotype.Can certainly make transmission-type liquid crystal spatial light regulator 29 work in amplitude conversely and be adjusted to holotype, and reflection type liquid crystal grating 30 works in the position and is adjusted to holotype mutually.It is worthy of note that working as light wave passes transmission-type liquid crystal spatial light regulator 29 back and forth for twice, it doubles to the position phase or the amplitude of light wave, utilizes this characteristic can significantly improve the range of adjustment of position phase or amplitude.Because liquid crystal grating 30 is light tight, wavelength is the front end oblique incidence of the coherent illumination light of λ from adiabatic taper optical waveguide bundle 4, and from the terminal outgoing of adiabatic taper optical waveguide bundle 4, project complex amplitude spatial light modulator 2 through coupling mechanism 3 then, carrying out amplitude through complex amplitude spatial light modulator 2 regulates back reflection mutually and returns with the position, once more through the reverse end that enters adiabatic taper optical waveguide bundle 4 of coupling mechanism 3 coupling, in the sandwich layer of every monomode optical waveguide of adiabatic taper optical waveguide bundle 4 ends, produce certain bits mutually and the conjugation light wave of amplitude.

Liquid crystal grating 30 mainly is made up of photosensitive layer and liquid crystal layer in Fig. 4, is light blocking layer and multilayer dielectric reflective coating in the middle of them, and driving voltage is applied to the liquid crystal layer both sides by photosensitive layer.When optical image when the back side projects photosensitive layer, the resistance of photosensitive layer changes, the voltage that is applied to the liquid crystal layer both sides so also changes, the light that incides liquid crystal layer from the front is after reflective layer reflects, pass liquid crystal layer once more, its phase and amplitude also change along with the change of optical image brightness.Liquid crystal layer itself is an integral body in liquid crystal grating, structurally be not made into one by one independently pixel, but the optical image that projects photosensitive layer is made up of a series of pixels, the voltage that liquid crystal received at each pixel place also is different like this, be equivalent to liquid crystal layer and be divided into one by one independently pixel, the size of each pixel equals the size of each pixel of optical image, and these pixels should be aimed at one by one with the pixel of transmission-type liquid crystal spatial light regulator 29.Digit optical disposal system 33 is made up of light source 34, digital micro-mirror (DigitalMicro-mirror Device) 35 and optical lens 36 in Fig. 4, the light that light source 34 sends has the optical image that certain luminance distributes through reflecting to form of digital micro-mirror 35, is imaged onto the back side of liquid crystal grating 30 again through optical lens 36.

Fig. 5 has provided and has adopted a transmission-type liquid crystal spatial light regulator and a reflective LCOS spatial light modulator to form composite space light regulator, the structural representation of the device of the realization digital optical phase conjugation of being built.Device and the device among Fig. 4 among Fig. 5 have all adopted the reflection type liquid crystal spatial light modulator, unique different be that device among Fig. 5 has replaced the liquid crystal grating 30 among Fig. 4 with a LCOS spatial light modulator 37.Because LCOS spatial light modulator self can drive by address pixels, so the digit optical disposal system 33 at liquid crystal grating 30 back sides can be omitted among Fig. 4, thereby has further simplified system architecture.

In Fig. 4 and Fig. 5, wavelength is the front end that the coherent illumination light of λ is directly incident on adiabatic taper optical waveguide bundle 4, and in order not block from the light wave of structure again of the front end outgoing of adiabatic taper optical waveguide bundle 4, illumination light is with bigger angle tilt incident.The benefit that adopts this lighting system is simple in structure, it is directional light that coherent illumination light also not necessarily needs, its shortcoming is after illumination light is passed adiabatic taper optical waveguide bundle 4, all inequality mutually from the amplitude of the light wave of every monomode optical waveguide sandwich layer of end outgoing with the position, and the possibility big rise and fall, need to measure in advance to demarcate.

Fig. 6 has provided the method that another coherent illumination light imports the front end of adiabatic taper optical waveguide bundle 4.Coherent illumination optical system 1 comprises a fibre bundle of being made up of many input optical fibres 38 in Fig. 5, input optical fibre 38 is around the outside of the front end that is fixed on adiabatic taper optical waveguide bundle 4, is wavelength the front end that the coherent illumination optically-coupled of λ is input to adiabatic taper optical waveguide bundle 4.

Claims

1. device of realizing digital optical phase conjugation, it is characterized in that: it is by lamp optical system (1), complex amplitude spatial light modulator (2), coupling mechanism (3) and adiabatic taper optical waveguide bundle (4) are formed, lamp optical system (1), complex amplitude spatial light modulator (2), coupling mechanism (3) and adiabatic taper optical waveguide bundle (4) are placed successively, and aim at mutually, the coherent light waves that makes lamp optical system (1) the send complex amplitude spatial light modulator (2) that evenly throws light on, carried out the end of adiabatic taper optical waveguide bundle (4) being coupled into through coupling mechanism (3) again after amplitude and position are regulated mutually by complex amplitude spatial light modulator (2), and luminous energy is converged in each monomode optical waveguide sandwich layer of adiabatic taper optical waveguide bundle (4) end, produce the phase conjugate light wave;

Described complex amplitude spatial light modulator (2) is by two transmission-type liquid crystal spatial light regulators (9,10) and three polaroids (11,12,13) form, first polaroid (13), first transmission-type liquid crystal spatial light regulator (10), second polaroid (12), second transmission-type liquid crystal spatial light regulator (9) and the 3rd polaroid (11) are placed successively, second transmission-type liquid crystal spatial light regulator (9), the pixel of first transmission-type liquid crystal spatial light regulator (10) is aimed at one by one, regulate first polaroid (11), second polaroid (12), the polarization direction of the 3rd polaroid (13) makes second transmission-type liquid crystal spatial light regulator (9), first transmission-type liquid crystal spatial light regulator (10) works in amplitude respectively and is adjusted to holotype and is adjusted to holotype mutually with the position;

Described coupling mechanism (3) is made up of a microlens array (14) and a light barrier (15), microlens array (14) one sides are close to complex amplitude spatial light modulator (2) and are placed, the focal plane of opposite side overlaps with the distal end faces of adiabatic taper optical waveguide bundle (4), design microlens array (14) is gone up each lenticular focal length and clear aperture and is made and converge to the critical angle of incidence of the incident angle of the light on the distal end faces of adiabatic taper optical waveguide bundle (4) less than the monomode optical waveguide of the end of adiabatic taper optical waveguide bundle (4) through each lenticule on the microlens array (14), light barrier (15) is close to the end of adiabatic taper optical waveguide bundle (4) and is placed, light barrier is manufactured with the light hole array on (15), light hole on the light barrier (15) is aimed at one by one with the sandwich layer of the monomode optical waveguide of the end of adiabatic taper optical waveguide bundle (4), the diameter of light hole is consistent with the diameter of the sandwich layer of the monomode optical waveguide of adiabatic taper optical waveguide bundle (4) end, lenticule on the microlens array (14) is aimed at one by one with the pixel on the complex amplitude spatial light modulator (2), make complex amplitude spatial light modulator (2) go up light that each pixel sends after lenticule focuses on, pass the light hole on the light barrier (15), accurately focus in the sandwich layer of each terminal monomode optical waveguide of adiabatic taper optical waveguide bundle (4);

Described adiabatic taper optical waveguide bundle (4) is made up of many monomode optical waveguides (16), draw close mutually in these monomode optical waveguides of front end (16) that the lateral dimension of conical optical waveguide bundle (4) is little, make the light field between them be coupled mutually, the big end of lateral dimension at conical optical waveguide bundle (4), monomode optical waveguide (16) is separated from each other, make the light field between them isolate mutually, the cone angle of control conical optical waveguide bundle (4) makes the lateral separation between monomode optical waveguide (16) sandwich layer slowly increase, and guarantees light wave generation basic mode monomode optical waveguide (16) only when the little front end of lateral dimension of conical optical waveguide bundle (4) propagates into big terminal of lateral dimension.

2. device of realizing digital optical phase conjugation, it is characterized in that: it is by lamp optical system (1), complex amplitude spatial light modulator (2), coupling mechanism (3) and adiabatic taper optical waveguide bundle (4) are formed, lamp optical system (1), complex amplitude spatial light modulator (2), coupling mechanism (3) and adiabatic taper optical waveguide bundle (4) are placed successively, and aim at mutually, the coherent light waves that makes lamp optical system (1) the send complex amplitude spatial light modulator (2) that evenly throws light on, carried out the end of adiabatic taper optical waveguide bundle (4) being coupled into through coupling mechanism (3) again after amplitude and position are regulated mutually by complex amplitude spatial light modulator (2), and luminous energy is converged in each monomode optical waveguide sandwich layer of adiabatic taper optical waveguide bundle (4) end, produce the phase conjugate light wave;

Described coupling mechanism (3) is by an optical lens (19), a compound microlens-microprism array (18) and a light barrier (15) are formed, each compound microlens-microprism on compound microlens-microprism array (18) is made up of a binary optical elements or holographic optical elements (HOE), the function of each compound microlens-microprism is equivalent to the combination of a lenticule and a microprism, the image planes of compound microlens-microprism array (18) overlap with the distal end faces of adiabatic taper optical waveguide bundle (4), the focal length of each the compound microlens-microprism on design compound microlens-microprism array (18), clear aperture and prism inclination angle make and to converge to the critical angle of incidence of the incident angle of the light on the distal end faces of adiabatic taper optical waveguide bundle (4) less than the terminal monomode optical waveguide of adiabatic taper optical waveguide bundle (4) through each the compound microlens-microprism on compound microlens-microprism array (18), light barrier (15) is close to the end of adiabatic taper optical waveguide bundle (4) and is placed, light barrier is manufactured with the light hole array on (15), light hole on the light barrier (15) is aimed at one by one with the sandwich layer of the monomode optical waveguide of adiabatic taper optical waveguide bundle (4) end, the diameter of light hole is consistent with the diameter of the sandwich layer of the monomode optical waveguide of adiabatic taper optical waveguide bundle (4) end, regulate the position of optical lens (19), make complex amplitude spatial light modulator (2) be positioned at the object plane of optical lens (19), and the object plane of compound microlens-microprism array (18) is positioned at the image planes of optical lens (19), each compound microlens-microprism on compound microlens-microprism array (18) is aimed at one by one with each pixel on the complex amplitude spatial light modulator (2), make light that each pixel of complex amplitude spatial light modulator (2) sends after each compound microlens on compound microlens-microprism array (18)-microprism focuses on, pass the light hole on the light barrier (15), converge in the sandwich layer of each terminal monomode optical waveguide of adiabatic taper optical waveguide bundle (4);

3. device of realizing digital optical phase conjugation, it is characterized in that: it is by lamp optical system (1), complex amplitude spatial light modulator (2), coupling mechanism (3) and adiabatic taper optical waveguide bundle (4) are formed, lamp optical system (1), complex amplitude spatial light modulator (2), coupling mechanism (3) and adiabatic taper optical waveguide bundle (4) are placed successively, and aim at mutually, the coherent light waves that makes lamp optical system (1) the send complex amplitude spatial light modulator (2) that evenly throws light on, carried out the end of adiabatic taper optical waveguide bundle (4) being coupled into through coupling mechanism (3) again after amplitude and position are regulated mutually by complex amplitude spatial light modulator (2), and luminous energy is converged in each monomode optical waveguide sandwich layer of adiabatic taper optical waveguide bundle (4) end, produce the phase conjugate light wave;

Described complex amplitude spatial light modulator (2) is by two transmission-type liquid crystal spatial light regulators (24,25), two semi-transparent semi-reflecting lens (20,21), two catoptrons (22,23) and two polaroids (26,27) form, first semi-transparent semi-reflecting lens (20), second semi-transparent semi-reflecting lens (21) and first catoptron (22), second catoptron (23) placed according to Michelson-interferometer mode, first transmission-type liquid crystal spatial light regulator (24), second transmission-type liquid crystal spatial light regulator (25) is placed on two arms of Michelson-interferometer respectively, semi-transparent semi-reflecting (A1-A2) of first transmission-type liquid crystal spatial light regulator (24) and second semi-transparent semi-reflecting lens (21) in angle of 45 degrees, second transmission-type liquid crystal spatial light regulator (25) and first transmission-type liquid crystal spatial light regulator (24) are the placement of mirror image symmetry with respect to semi-transparent semi-reflecting (A1-A2) of second semi-transparent semi-reflecting lens (21), make first transmission-type liquid crystal spatial light regulator (24), the pixel of second transmission-type liquid crystal spatial light regulator (25) is aimed at one by one, first polaroid (26) and second polaroid (27) are parallel to first transmission-type liquid crystal spatial light regulator (24) respectively, second transmission-type liquid crystal spatial light regulator (25), first polaroid (26) and second polaroid (27) lay respectively at the light inlet and the light-emitting window of Michelson-interferometer, select the polarization direction of first polaroid (26) and second polaroid (27), make first transmission-type liquid crystal spatial light regulator (24), second transmission-type liquid crystal spatial light regulator (25) all works in the position and is adjusted to holotype mutually;

4. device of realizing digital optical phase conjugation, it is characterized in that: it is by lamp optical system (1), complex amplitude spatial light modulator (2), coupling mechanism (3) and adiabatic taper optical waveguide bundle (4) are formed, lamp optical system (1), complex amplitude spatial light modulator (2), coupling mechanism (3) and adiabatic taper optical waveguide bundle (4) are placed successively, and aim at mutually, the coherent light waves that makes lamp optical system (1) the send complex amplitude spatial light modulator (2) that evenly throws light on, carried out the end of adiabatic taper optical waveguide bundle (4) being coupled into through coupling mechanism (3) again after amplitude and position are regulated mutually by complex amplitude spatial light modulator (2), and luminous energy is converged in each monomode optical waveguide sandwich layer of adiabatic taper optical waveguide bundle (4) end, produce the phase conjugate light wave;

Described complex amplitude spatial light modulator (2) is by a transmission-type liquid crystal spatial light regulator (29), one blocks of reflecting liquid crystal grating (30), two polaroids (31,32) and digit optical disposal system (33) form, first polaroid (31), transmission-type liquid crystal spatial light regulator (29), second polaroid (32) and reflection type liquid crystal grating (30) are placed successively, digit optical disposal system (33) is placed on the back of reflection type liquid crystal grating (30), one width of cloth optical image is imaged onto the back side of reflection type liquid crystal grating (30), the pixel of this optical image is aimed at one by one with the pixel of transmission-type liquid crystal spatial light regulator (29), adjust first polaroid (31), the polarization direction of second polaroid (32), make transmission-type liquid crystal spatial light regulator (29) and reflection type liquid crystal grating (30) work in the position respectively and be adjusted to holotype mutually and amplitude is adjusted to holotype, the illumination coherent light is from the front end incident of adiabatic taper optical waveguide bundle (4), and from the terminal outgoing of adiabatic taper optical waveguide bundle (4), project complex amplitude spatial light modulator (2) through coupling mechanism (3), after complex amplitude spatial light modulator (2) reflection once more through the reverse end that enters adiabatic taper optical waveguide bundle (4) of coupling mechanism (3) coupling;

5. device of realizing digital optical phase conjugation, it is characterized in that: it is by lamp optical system (1), complex amplitude spatial light modulator (2), coupling mechanism (3) and adiabatic taper optical waveguide bundle (4) are formed, lamp optical system (1), complex amplitude spatial light modulator (2), coupling mechanism (3) and adiabatic taper optical waveguide bundle (4) are placed successively, and aim at mutually, the coherent light waves that makes lamp optical system (1) the send complex amplitude spatial light modulator (2) that evenly throws light on, carried out the end of adiabatic taper optical waveguide bundle (4) being coupled into through coupling mechanism (3) again after amplitude and position are regulated mutually by complex amplitude spatial light modulator (2), and luminous energy is converged in each monomode optical waveguide sandwich layer of adiabatic taper optical waveguide bundle (4) end, produce the phase conjugate light wave;

Described complex amplitude spatial light modulator (2) is by a transmission-type liquid crystal spatial light regulator (29), one blocks of reflecting LCOS LCD space light modulator (37), two polaroids (31,32) and digit optical disposal system (33) form, first polaroid (31), transmission-type liquid crystal spatial light regulator (29), second polaroid (32) and reflective LCOS LCD space light modulator (37) are placed successively, the pixel of transmission-type liquid crystal spatial light regulator (29) is aimed at one by one with the pixel of reflective LCOS LCD space light modulator (37), adjust first polaroid (31), the polarization direction of second polaroid (32), make transmission-type liquid crystal spatial light regulator (29) and reflective LCOS LCD space light modulator (37) work in the position respectively and be adjusted to holotype mutually and amplitude is adjusted to holotype, the illumination coherent light is from the front end incident of adiabatic taper optical waveguide bundle (4), and from the terminal outgoing of adiabatic taper optical waveguide bundle (4), project complex amplitude spatial light modulator (2) through coupling mechanism (3) then, after complex amplitude spatial light modulator (2) reflection once more through the reverse end that enters adiabatic taper optical waveguide bundle (4) of coupling mechanism (3) coupling;