CN106199990B - Produce the method and laser of vector special space relational structure low coherence light beam - Google Patents
Produce the method and laser of vector special space relational structure low coherence light beam Download PDFInfo
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- CN106199990B CN106199990B CN201610717655.XA CN201610717655A CN106199990B CN 106199990 B CN106199990 B CN 106199990B CN 201610717655 A CN201610717655 A CN 201610717655A CN 106199990 B CN106199990 B CN 106199990B
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- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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Abstract
The present invention relates to a kind of method and laser for producing vector special space relational structure low coherence light beam, including total reflection mirror（1）, operation material（2）, driving source (10）, Brewster window (3）, linear polarizer (4）, half-wave plate (5）, polarization spectroscope (6）(15）, beam expanding lens (7）(11）, thin lens (8）、(12）(16）, amplitude attenuator (13）, metallic-membrane plating reflector (9）(14）, output coupling mirror (17）.4f optical systems are placed in Fabry Perot chamber, form degeneracy chamber, direct output par, c coherent beam；The size in light intensity attenuation region is controlled by metallic-membrane plating reflector, changes coherence's size of output beam；Spot size on metallic-membrane plating reflector is adjusted by adjusting beam expanding lens, control reflection modulus, adjusts coherence；Different vector beam is produced using improved Mach-Zehnder interferometers；Metallic-membrane plating reflector is placed at the frequency plane of 4f optical systems, different modulation is carried out to frequency plane, obtain the output beam of different special space relational structure distributions.
Description
Technical field
The present invention relates to laser field, more particularly to a kind of a variety of vector special space relational structure low coherence light beams of generation
Method and laser, obtained light beam is in optical acquisition, material heat treatment, high quality without speckle imaging, free optical communication etc.
Aspect plays the role of important.
Background technology
Since laser occurs, it is widely used in the fields such as military, civilian and scientific research.What laser came out
Light beam is considered completely coherent light beam, but on stricti jurise for should be referred to as high coherence beam, this is also laser four
One of big characteristic, but in practical application, it is found that high coherence beam can be negatively affected to some applications, because coherence
It is higher, interference is more easily caused in transmitting procedure, so as to cause speckle, this is applied for high quality imaging, laser cladding etc.
Huge obstruction is caused, so the research of partially coherent (Low coherence) light beam becomes one of popular research.Partially coherent light beam
It is gaussian schell model light beam that classics, which represent, its light intensity and space correlation structure distribution (degree of coherence distribution) are all Gaussian.
In recent years, there is the huge interest that special space relational structure partially coherent light beam causes researcher, because this
A little light beams have many unique properties, such as：Non-homogeneous associated section coherent beam has self-focusing spy in transmitting procedure
Property；After Laguerre Gauss associated section coherent beam line focus three-dimensional prisoner's cage is produced near focal point；Hermite-Gaussian associated section
There is spontaneous fission property in transmitting procedure in coherent beam；The symmetrical cosine Gaussian portion coherent beam of circle forms anchor ring in far field
Bag circle light distribution；Rectangular symmetrical cosine Gaussian portion coherent beam forms 4 sub- beam array distributions in far field；Broad sense multimode
Gauss associated section coherent beam can both form the distribution of annulus bagel in far field, can also form the symmetrical flat-top distribution of circle.
The generation and research of these light beams have benefited from Gori et al. and build in theory to special space relational structure partially coherent light
The adequate condition that Shu Zhenshi is produced.It is being tested and produced in theory through everybody such as Cai Yangjian, Wang Fei, the honor of the plum palm, Olga
And research, its result can be foretold：These special light beams particle-capture, atmospheric communication, laser cladding, information loading decryption,
There is completely coherent light beam and conventional part coherent beam (gaussian schell model light beam) can not replace for high quality imaging etc.
The effect in generation.
For a long time, for partially coherent light beam, numerous researchers are that it is studied using the scalar field mechanical approach,
But this will ignore the polarization characteristic of light beam, so that many useful information and application can be lost, such as now for some
The optical communication of practical application, is exactly the polarization characteristic using light beam, is defined as 1 to its some polarization direction, in vertical direction
0 is defined as, so as to which Information Pull binary add is loaded on the polarization characteristic of light beam, light beam polarization is carried out in receiving terminal
Detection, so as to decode.In addition, widely study and show through scholar：Vector section coherent beam free optical communication,
The application such as high-resolution imaging, data encryption, illumination optical has important value.
Test and produce for special space relational structure partially coherent light beam, be essentially confined at present outside chamber, laser goes out
The basic mode light beam come passes through some optical components, such as the component such as spatial light modulator, frosted glass, thin lens, you can production
Raw desired special space relational structure partially coherent light beam.But the higher cost price of spatial light modulator, Low threshold work(
Rate and poor efficiency, the unstability of the mechanical shaking of frosted glass, certainly will cause to hinder to practical applications such as its high powers, such as
Military aspect.
In view of the above shortcomings, the designer, is actively subject to research and innovation, it is special to found a kind of a variety of vectors of generation
The method and laser of different space correlation structure low coherence light beam, make it with more the utility value in industry.
The content of the invention
In order to solve the above technical problems, the object of the present invention is to provide one kind to produce the low phase of vector special space relational structure
The method and laser of dry light beam, the light beam that directly output comes is vector special space relational structure partially coherent light beam, institute
The vector special space relational structure partially coherent light beam of generation is in particle-capture, laser cladding, free optical communication, information loading
Decryption, high quality imaging etc. have a wide range of applications.
The method of the generation vector special space relational structure low coherence light beam of the present invention, including step：
S1, utilize parallel total reflection mirror and output coupling mirror, and three thin lens composition degeneracy chamber；
S2, in degeneracy intracavitary using xenon lamp as driving source, make Nd：Particle in YAG realizes population after energy is absorbed
Reversion, after more than its threshold value, is ready to realize that light beam is excited amplification；
S3, the light beam experience Brewster window that will be excited amplification, obtain partial polarization light beam, then by linear polarizer, obtain
Pure linearly polarized light beam, afterwards by half-wave plate, the polarization direction of linearly polarized light beam is rotated by rotatable halfwave plate；
S4, the light beam come out from half-wave plate, are divided into transmitted light beam and the reflected beams by the first polarization spectroscope, will transmit
Light beam reaches the second polarization spectroscope through beam expanding lens, thin lens, metallic-membrane plating reflector；By the reflected beams through beam expanding lens, thin lens, shake
Width attenuator, metallic-membrane plating reflector reach the second polarization spectroscope, and two-way light beam is through the second polarization spectroscope Vector modulation, output arrow
The output of partially coherent light beam is measured, eventually passes through thin lens and output coupling mirror, output vector special space relational structure part phase
Dry light beam.
The laser of the generation vector special space relational structure low coherence light beam of the present invention, including
The parallel total reflection mirror (1) and output coupling mirror (17) of-composition Fabry-Perot-type cavity, the Fabry-Perot
Three thin lens (8,12,16) for being become degeneracy chamber are equipped with sieve chamber；
- the light beam being arranged between total reflection mirror (1) and output coupling mirror (17) produces component, the light beam
Producing component includes light source, Brewster window (3) and linear polarizer (4)；
- light beam is divided into the orthogonal two bunch light beam in polarization direction and two bunch light beams are inclined
The improved Mach-Zender interferometer of the coupled outgoing mirror output of the resultant vector light beam that shakes, the improved Mach-Zehnder
Interferometer includes the first polarization spectroscope (6), two thin lens (8,12), is located at respectively on transmitted light path and reflected light path
Two metallic-membrane plating reflectors (9,14) and the second polarization spectroscope (15) for synthesizing the light beam polarization of two metallic-membrane plating reflectors reflection,
Wherein two thin lens (8,12) are respectively on the first polarization spectroscope transmitted light path and reflected light path；
- the thin lens (16) is arranged between the second polarization spectroscope (15) and output coupling mirror (17), wherein thin
Mirror (8,16) forms the 4f imaging systems on the first polarization spectroscope transmitted light path, and thin lens (12,16) forms the first polarization point
4f imaging systems on light microscopic reflected light path.
Further, two metallic-membrane plating reflectors (9,14) are arrived in second polarization spectroscope (15) synthesis light path
The distance of thin lens (16) be equal to the distance that thin lens (16) arrives the output coupling mirror (17), and equal to thin lens (16)
Focal length.
Further, two metallic-membrane plating reflectors (9,14) are placed at the frequency plane of two 4f optical systems.
Further, reflected between the thin lens (8) on first polarization spectroscope (6) and its transmitted light path and with it
Beam expanding lens (7,11) is equipped between thin lens (12) in light path.
Further, the improved Mach-Zender interferometer, which further includes, is arranged on the first polarization spectroscope (6) reflection
The amplitude attenuator (13) between thin lens (12) and metallic-membrane plating reflector (14) in light path.
Further, half-wave plate (5) is equipped between the linear polarizer (4) and the first polarization spectroscope (6).
Further, the light source includes making the particle in operation material realize swashing for population inversion after energy is absorbed
Encourage source.
Further, the driving source is xenon lamp.
Further, the operation material is Nd：YAG.
According to the above aspect of the present invention, the present invention has at least the following advantages：
1st, can direct output vector special space relational structure partially coherent light beam, be not required to cumbersome modulation, transport outside chamber and take
Band is convenient, and it is very big convenient to be provided for its application；
The 2nd, 4f optical systems are placed in the Fabry-Perot being made of two parallel total reflection mirrors and output coupling mirror
Sieve chamber, that is, form degeneracy chamber, all patterns are all eigen modes, i.e. this optics cavity can support multimode, so that direct output par, c
Coherent beam, mould is controlled using the plated film on metallic-membrane plating reflector to the size (playing diaphragm or so) in light intensity attenuation region
Number, so as to change coherence's size of output beam, modulus is more, and the coherence of output beam is lower, in addition, Ke Yitong
Overregulate beam expanding lens to adjust spot size on metallic-membrane plating reflector, since realize the control of reflection modulus, it is same can be achieved it is relevant
The adjusting of property；
3rd, light beam is divided into two beams using improved Mach-Zender interferometer, then coherent superposition, easily to produce
Vector beam, can by the control to beam expanding lens and amplitude attenuator, to obtain the effect of different coherent superpositions, it is exportable not
The same vector beam；
4th, metallic-membrane plating reflector is placed at the frequency plane of 4f optical systems, various amplitude can be plated on plane mirror and declined
Subtract film, based on Van Cittert Zernike principles, different modulation can be carried out to frequency plane, different special skies can be obtained
Between relational structure be distributed output beam；
5th, in the prior art, vector special space relational structure partially coherent light beam is produced outside chamber, device is more miscellaneous more, modulation
It is cumbersome, LCD space light modulator is all generally used in experiment, since its price is of a relatively high, damage threshold is relatively low and low
Efficiency, the realization for partially coherent light beam, is by means of rotating frosted glass, but it is with mechanical shaking unstability,
And experimentally, the controllable scope of its coherence is relatively narrow, this practical application to its light beam, special Military Application, causes
Great obstacle；And LCD space light modulator is not used in the optical cavity of the present invention, so high power-beam can be produced, for portion
Divide the formation of coherent beam and the regulation and control of coherence, be that numerous patterns can be supported based on this optical cavity, by intracavitary modulus
Regulation and control, it can be achieved that coherence is adjusted, and adjustable region is larger, from being concerned with completely to completely incoherent；And the present invention
Apparatus structure simple and compact, the component of use are easily purchased, and relative low price, there is huge potential using value.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of specification, below with presently preferred embodiments of the present invention and coordinate attached drawing describe in detail as after.
Brief description of the drawings
Fig. 1 is the structure diagram of the device of the invention；
Fig. 2 is Brewster window fundamental diagram in the present invention；
Fig. 3 is polarization spectroscope fundamental diagram in the present invention；
Fig. 4 is 4f optical system schematic diagrames in the present invention；
Fig. 5 enumerates schematic diagram for metallic-membrane plating reflector in the present invention；
Fig. 6 enumerates schematic diagram for output beam degree of coherence distribution in the present invention.
Embodiment
With reference to the accompanying drawings and examples, the embodiment of the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but is not limited to the scope of the present invention.
Referring to Fig. 1, in the present invention, a kind of laser for producing vector special space associated section coherent beam, including
Total reflection mirror 1, operation material 2, driving source 10, Brewster window 3, linear polarizer 4, half-wave plate 5, polarization spectroscope 6 and 15, expansion
Beam mirror 7 and 11, thin lens 8,12 and 16 (three thin lens are duplicate, and with f focal length), amplitude attenuator 13,
The angle that metallic-membrane plating reflector 9 and 14, output coupling mirror 17, the wherein axis of the normal of Brewster window and optical cavity are formed is cloth scholar
This special angle.
The method of the generation vector special space relational structure partially coherent light beam of the present invention comprises the following steps：
S1, using parallel total reflection mirror and output coupling mirror, and three thin lens form degeneracy chamber, i.e., by 4f optics
System (being made of two duplicate thin lens) is placed in Fabry-Perot-type cavity, forms degeneracy chamber, i.e. intracavitary can be supported
Numerous patterns, realize that partially coherent light beam exports, or even complete non-coherent bundle, at 4f optical system frequency planes, place plating
Film speculum carries out light intensity shaping, based on Van Cittert Zernike theorems, can be by replacing different coated reflections
Mirror (metallic-membrane plating reflector of the distribution of different transmittance functions and size) realizes different spaces relational structure partially coherent light beam
Output；
S2, xenon lamp are as driving source so that operation material (Nd：YAG the particle in) realizes population after energy is absorbed
Reversion, after more than its threshold value, is ready to realize that light beam is excited amplification；
S3, obtain partial polarization light beam when the light beam for being excited amplification by Brewster window, then by linear polarizer, so that
Pure linearly polarized light beam (filtering off polarization light) is obtained, afterwards by half-wave plate, linearly polarized light is rotated by rotatable halfwave plate
The polarization direction of beam；
S4, the light beam come out from half-wave plate, are divided into two beams (transmitted light beam and the reflected beams) by the first polarization spectroscope,
On transmitted light path, light beam reaches the second polarization spectroscope through beam expanding lens, thin lens, metallic-membrane plating reflector；In reflected light path, light beam
Through beam expanding lens, thin lens, amplitude attenuator, metallic-membrane plating reflector, the second polarization spectroscope is reached, two-way light beam is through the second polarization point
Light microscopic Vector modulation, output vector partially coherent light beam, eventually passes through thin lens and output coupling mirror, output vector special space
Relational structure partially coherent light beam.
Detailed process is：Driving source 10 to operation material 2 provide energy, particle after energy is absorbed, its from low-lying level to
High energy order transition, causes population inversion, is ready to be excited amplification.After light beam is by operation material 2, its experience is excited
Amplification.When light beam (being non-polarized light beam) the experience Brewster window 3 of amplification, partial polarization light beam can be obtained, as shown in Figure 2.
Referring to Fig. 2, when a branch of non-polarized light beam along optical cavity axis with the corresponding Brewster's angle of Brewster window (θ=
arctann2/n1, n1For the refractive index of environment, n2For the refractive index of the Brewster window material, then θ is the Brewster window institute
Corresponding Brewster's angle, also referred to as polarizing angle) it is incident angles to Brewster window, then and the light beam of reflection is line
Light beam, and its polarization direction is referred to as S light, is part by the light beam of Brewster window transmission perpendicular to the plane of incidence
Light beam, it contains the polarized component (be referred to as P light) for being largely parallel to the plane of incidence, and a small amount of perpendicular to the plane of incidence
S light.This means S light in resonator, its loss will be greater than by the obtained gain of gain media, thus can not be formed
Vibration.Last result is exactly, and can be really P light in resonator stimulated radiation amplification, finally from the laser of optical cavity output
P light is comprised only, forms linearly polarized light beam.
The partial polarization light beam come out from Brewster window 3, by linear polarizer 4, obtains complete linearly polarized light beam, wherein
The polarization transmission direction of linear polarizer 4 should be adjusted to the P parallel lights come out with Brewster window 3, meet P light all by and S
Light is filtered.Adjust what P light polarization direction of the polarization transmission direction of linear polarizer 4 with Brewster window 3 out was parallel to each other
Method is：Beam splitter is placed after linear polarizer 4, to draw outside light beam to chamber, is detected and drawn using optical power detector
The size of light beam light intensity, by rotating linear polarization 4, the light intensity for drawing light beam changes, and when wherein light intensity is maximum, line is inclined
Shake piece 4 transmission direction meet with Brewster window 3 come out P parallel lights.
The linearly polarized light come out from linear polarization 4, perpendicular through half-wave plate 5, is changed from its transmission by rotatable halfwave plate 5
Go out the polarization direction of linearly polarized light beam.The linearly polarized light beam transmitted from half-wave plate 5 passes through the first polarization spectroscope 6, can obtain
The two bunch light beams for getting along vertical with transmission direction to polarization direction, as shown in figure 3, wherein from the first polarization spectroscope 6
The linearly polarized light beam (it is assumed that x directions polarize) of transmission all the way, by beam expanding lens 7 and thin lens 8, and it is anti-through metallic-membrane plating reflector 9
After penetrating, the second polarization spectroscope 15 is reached；And another linearly polarized light beam all the way is reflected (it is assumed that y from the first polarization reflective mirror 6
Direction polarizes), by beam expanding lens 11, thin lens 12 and amplitude attenuator 13, and after the reflection of metallic-membrane plating reflector 14, reach second
Polarization spectroscope 15；On first polarization spectroscope, 6 transmitted light path and reflected light path, the two orthogonal linear polarizations in beam polarization direction
Light beam can obtain vector beam, wherein polarization spectroscope 6 and 15,7 and of beam expanding lens after 15 polarized combination of the second polarization spectroscope
11st, thin lens 8 and 12, amplitude attenuator 13, and metallic-membrane plating reflector 9 and 14 constitute improved Mach-Zender interferometer.
For in above-mentioned steps, changing the angle of the polarization of outgoing linearly polarized light beam by rotatable halfwave plate 5, so as to
To realize that the light intensity of the two-way light beam to being come out from the first polarization spectroscope 6 is adjusted；On reflected light path, amplitude has been disposed
Attenuator 13, can decay the light beam on monochromatic light road into row amplitude.Amplitude attenuator 13 can be accurately controlled two-way light with half-wave plate 5
The size of Shu Guangqiang, the degree coupled so as to fulfill electric field x directions with y directions, controls vector beam characteristic.
The device of the invention is installed on Fabry-Perot-type cavity using 4f imaging systems, forms degeneracy chamber.It is wherein thin
The 4f imaging systems that mirror 8 and 16 will be formed on 6 transmitted light path of the first polarization spectroscope (x directions polarize light path), and thin lens 12
The 4f imaging systems on 6 reflected light path of the first polarization spectroscope (y directions polarize light path) will be formed with 16.It is imaged based on two 4f
System, total reflection mirror 1 will image in output coupling mirror 17, and same output coupling mirror 17 will be imaged at total reflection mirror 1, such as Fig. 4
It is shown, this mean that all patterns the complete transmission of experience one (such as：From total reflection mirror 1, coupled output
Mirror 17 arrives total reflection mirror 1 again after reflecting), oneself can be reproduced, i.e. the reproduction certainly of pattern, so all patterns are all this chambers
Eigen mode, this just illustrates that this optical cavity is degeneracy chamber.Because optical cavity for this can support numerous patterns, thus optical cavity can directly export it is low
Coherence beam, can be by controlling modulus, and to adjust the coherence of output beam height, modulus is more, the coherence of output
It is lower.
In the optical cavity of the present invention, metallic-membrane plating reflector 9 and 14 is respectively disposed on two polarization paths (the first polarization spectroscope 6
Transmitted light path and reflected light path) 4f system spectrums face at, as shown in Figure 4.It is in plane for metallic-membrane plating reflector 9 and 14
The film of different reflectivity distribution is coated with total reflection mirror, plays the role of carrying out shaping to light intensity, as shown in figure 5, its reflectivity
It can be achieved from 0% to 100% (without considering absorption loss etc.), it is corresponding from black to white area.By in fully-reflected plane mirror
The film of upper plating different distributions reflectivity, to obtain the shaping effect different to light intensity.
The regulation and control of regulation and control for coherence's size, i.e. modulus, are realized based on metallic-membrane plating reflector 9 and 14, this be because
For the plated film factor due to metallic-membrane plating reflector 9 and 14, some regions can be reflected, some regions can not be reflected, and so mean to plate
The size and shape of film distribution can influence the quantity by 9 and 14 pattern of metallic-membrane plating reflector, and the tune of coherence can be realized with this
Control, the effect of this and classical intracavitary diaphragm modeling play the same tune on different musical instruments wonderful.
In the present invention, the plated film distribution chosen on metallic-membrane plating reflector 9 and 14 is larger, so that satisfaction can be from metallic-membrane plating reflector
9 and 14 can be more with the pattern of supporting reflex, and so as to fulfill before the reflection of metallic-membrane plating reflector 9 and 14, which may be considered
Complete non-coherent bundle, and light distribution is to be uniformly distributed.I.e. in space-spectrum domain, the cross-spectral density letter of this light beam
Number expression formula can be expressed as：
J0(r1,r2δ (the r of)=11-r2),
Wherein, r1, r2For the vector position of point at frequency spectrum；δ is Dirac function, only when meeting r1=r2When, equal to 1,
Remaining situation is all 0.It is 1 wherein because light distribution is uniform, and because being completely incoherent, associate letter
Number can be represented with Dirac function.
Metallic-membrane plating reflector 9 and 14 pairs of incident light beams play the role of Modulation and Amplitude Modulation, it is assumed that it is f to intensity modulation function
(r1,r2), then after the reflection of metallic-membrane plating reflector 9 and 14, the cross-spectral density function of its outgoing beam can be written as：
J1(r1,r2)=f (r1,r2)J0(r1,r2)=f (r1,r2)δ(r1-r2)=f (r1),
This light beam is still complete non-coherent bundle.
The complete incoherent certain light intensity distribution reflected from metallic-membrane plating reflector 9 and 14 (is exactly the anti-of metallic-membrane plating reflector
Penetrate rate distribution) light beam, through thin lens 16, finally reach on output coupling mirror 17, because coated reflection 9 and 14 arrives thin lens 16
Distance be equal to thin lens 16 arrive output coupling mirror 17 distance, and equal to thin lens 16 focal length f.In this transmitting procedure
In, go to represent by transmission matrix ABCD rules, and Ke Lin formula are utilized, the optics for reaching 17 light beam of output coupling mirror can be studied
Property, wherein can be expressed as this process transmission matrix ABCD：
Wherein Ke Lin formula are：
According to the corresponding ABCD values of this transmitting procedure, its Ke Lin formula can abbreviation be：
Above formula is that Fourier changes formula, wherein J1(r1,r2) for metallic-membrane plating reflector 9 and 14 reflect after light beam intersection
Spectral density function, substitutes into above formula by its result, can obtain：
This namely Van Cittert Zernike is theoretical, is shown by above formula, reaches 17 light beam of output coupling mirror
Cross-spectral density function can represent metallic-membrane plating reflector reflectance distribution function f (r1) Fourier's change, and be multiplied by one and be
Number, wherein to f (r1) Fourier change after result only and ρ2-ρ1Value it is related, so this result is spatial correlation function
(degree of coherence distribution function), is Xie Er models.
By studying above formula, obtaining the light beam at output coupling mirror 17 has following characteristic：
1st, the light distribution of light beam is to be uniformly distributed；
2nd, the degree of coherence of light beam is distributed as Fourier's change of 9 and 14 coated reflection rate distribution function of metallic-membrane plating reflector.
Therefore, this is, it is intended that the film that can be distributed by being coated with different reflectivity on fully-reflected plane mirror, comes real
The partially coherent light beam of different spaces relational structures distribution is now exported from output coupling mirror 17, as shown in Figure 6 (with it is next on Fig. 5
One corresponds to).
The Mach-Zender interferometer of vector beam is produced using optics coherence tomography above, it is possible to achieve fill from the laser
Put the partially coherent light beam of direct output vector different spaces relational structure distribution because space correlation structure distribution can realize it is non-
Gauss, so referred to as special space relational structure is distributed.
Wherein in improved Mach-Zender interferometer, beam expanding lens 7 and 11, continuously adjustable spot size, so that real
The size of present 8 and 12 focal point metallic-membrane plating reflector 9 of thin lens and 14 hot spots.The spot size come out from beam expanding lens 7 and 11 is got over
Greatly, the spot size for focusing on metallic-membrane plating reflector 9 and 14 is smaller.Assuming that the plated film size and shape of metallic-membrane plating reflector 9 and 14 is not
Become, then focus on that the hot spot of metallic-membrane plating reflector 7 and 14 is smaller, then the pattern count passed through is more, show from output coupling mirror 17
The light beam coherence of output is lower.It means that it can be regulated and controled by beam expanding lens 7 and 11 couples of output coherences.Except this it
Outside, regulated and controled by beam expanding lens 7 and 11 pairs of two-way beam spot sizes, realized to electric field x directions and y directions degree of coupling
Modulation, so as to change light beam vectorial property.
The method and laser of the generation vector special space relational structure partially coherent light beam of the present invention, wherein vector
Realization is to be based on improved Mach-Zender interferometer.Wherein beam expanding lens 7 and 11, amplitude attenuator 13 and half-wave plate 5 are adjustable
The degree of coupling between electric field x directions and y directions is controlled, the vectorial property of light beam can be changed；Realization for partially coherent light beam,
It is to be based on disposing 4f optical systems in Fabry-Perot-type cavity, to form degeneracy chamber.This optical cavity can support numerous patterns,
Modulus is more, then lower from the light beam coherence of laser output；4f optical system frequency spectrums are adjusted using beam expanding lens 7 and 11
Spot size (at metallic-membrane plating reflector 9 and 14) at face, to realize the control of the height to output beam coherence.In addition,
For metallic-membrane plating reflector 9 and 14, by selecting the size of different reflectivity distributed areas, to control the size of flare, from
And realize the control to modulus, the size of final control output coherence；For the realization of special space relational structure distribution, it is
It is theoretical based on Van Cittert Zernike, for complete non-coherent bundle, its after Fourier changes transmission, light beam
Correlation function is Fourier's change of the complete non-coherent bundle light intensity.So plate different reflections on metallic-membrane plating reflector 9 and 14
The film of rate distribution, to realize the light intensity shaping to incident beam.And metallic-membrane plating reflector 9 and 14 arrives the distance of thin lens 16 equal to thin
Lens 16 arrive the distance of output coupling mirror 17, and equal to the focal length of thin lens 16, this optical system can realize that Fourier changes
Optical delivery.So the metallic-membrane plating reflector 9 and 14 of selection different reflectivity distribution, to obtain different space correlation structure distributions
Partially coherent light beam output.It is distributed why it is referred to as special space relational structure, is because the present invention can be achieved except warp
Outside the space correlation structure distribution of allusion quotation Gauss formula, non-gaussian distribution can be also realized.
The above is only the preferred embodiment of the present invention, is not intended to limit the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is some improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
- A kind of 1. method for producing vector special space relational structure low coherence light beam, it is characterised in that including step：S1, utilize parallel total reflection mirror and output coupling mirror, and three thin lens composition degeneracy chamber；S2, in degeneracy intracavitary using xenon lamp as driving source, make Nd：Particle in YAG realizes population inversion after energy is absorbed, After more than its threshold value, it is ready to realize that light beam is excited amplification；S3, the light beam experience Brewster window that will be excited amplification, obtain partial polarization light beam, then by linear polarizer, obtain pure line Light beam, afterwards by half-wave plate, the polarization direction of linearly polarized light beam is rotated by rotatable halfwave plate；S4, the light beam come out from half-wave plate, are divided into transmitted light beam and the reflected beams, by transmitted light beam by the first polarization spectroscope The second polarization spectroscope is reached through beam expanding lens, thin lens, metallic-membrane plating reflector；The reflected beams are declined through beam expanding lens, thin lens, amplitude Subtract piece, metallic-membrane plating reflector the second polarization spectroscope of arrival, two-way light beam is through the second polarization spectroscope Vector modulation, output vector portion Divide coherent beam output, eventually pass through thin lens and output coupling mirror, output vector special space relational structure partially coherent light Beam.
- 2. a kind of laser for producing vector special space relational structure low coherence light beam as claimed in claim 1, its feature It is：IncludingThe parallel total reflection mirror of-composition Fabry-Perot-type cavity（1）And output coupling mirror（17）, the Fabry-Perot-type cavity In be equipped with and become the first thin lens of degeneracy chamber（8）, the second thin lens（12）With the 3rd thin lens（16）；- it is arranged on total reflection mirror（1）And output coupling mirror（17）Between light beam produce component, the light beam produces Component includes light source, Brewster window（3）And linear polarizer（4）；- light beam is divided into the orthogonal two bunch light beam in polarization direction and polarizes two bunch light beams and is closed Into the improved Mach-Zender interferometer of the coupled outgoing mirror output of vector beam, the improved Mach Zehnder interference Instrument includes the first polarization spectroscope（6）, first thin lens（8）, second thin lens（12）, be located at transmitted light path respectively With two metallic-membrane plating reflectors on reflected light path（9、14）And synthesize the light beam polarization of two metallic-membrane plating reflectors reflection second is inclined Shake spectroscope（15）, wherein first thin lens（8）With second thin lens（12）It is located at the first polarization spectroscope respectively On transmitted light path and reflected light path；- the 3rd thin lens（16）It is arranged on the second polarization spectroscope（15）With output coupling mirror（17）Between, wherein described First thin lens（8）With the 3rd thin lens（16）Form the 4f imaging systems on the first polarization spectroscope transmitted light path, institute State the second thin lens（12）With the 3rd thin lens（16）Form the 4f imaging systems on the first polarization spectroscope reflected light path.
- 3. the laser according to claim 2 for producing vector special space relational structure low coherence light beam, its feature exist In：Two metallic-membrane plating reflectors（9、14）To positioned at second polarization spectroscope（15）The described 3rd in synthesis light path is thin Mirror（16）Distance be equal to the 3rd thin lens（16）To the output coupling mirror（17）Distance, and equal to the described 3rd thin Lens（16）Focal length.
- 4. the laser according to claim 3 for producing vector special space relational structure low coherence light beam, its feature exist In：Two metallic-membrane plating reflectors（9、14）It is placed at the frequency plane of two 4f optical systems.
- 5. the laser according to claim 4 for producing vector special space relational structure low coherence light beam, its feature exist In：First polarization spectroscope（6）With the first thin lens on its transmitted light path（8）Between and with the institute on its reflected light path State the second thin lens（12）Between be equipped with beam expanding lens（7、11）.
- 6. the laser according to claim 5 for producing vector special space relational structure low coherence light beam, its feature exist In：The improved Mach-Zender interferometer, which further includes, is arranged on the first polarization spectroscope（6）Described on reflected light path Two thin lens（12）With metallic-membrane plating reflector（14）Between amplitude attenuator（13）.
- 7. the laser according to claim 6 for producing vector special space relational structure low coherence light beam, its feature exist In：The linear polarizer（4）With the first polarization spectroscope（6）Between be equipped with half-wave plate（5）.
- 8. the laser of vector special space relational structure low coherence light beam is produced according to claim 2-7 any one of them, It is characterized in that：The light source includes the driving source for making the particle in operation material realize population inversion after energy is absorbed.
- 9. the laser according to claim 8 for producing vector special space relational structure low coherence light beam, its feature exist In：The driving source is xenon lamp.
- 10. the laser according to claim 9 for producing vector special space relational structure low coherence light beam, its feature exist In：The operation material is Nd：YAG.
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| CN112593071A (en) * | 2020-11-25 | 2021-04-02 | 中国科学院宁波材料技术与工程研究所 | Energy-tunable single-sided and double-sided laser shock peening system |
| CN112928587B (en) * | 2021-01-25 | 2022-09-02 | 中国科学院上海光学精密机械研究所 | Laser oscillator for generating light spot with any shape |
| CN113031290B (en) * | 2021-03-13 | 2022-06-24 | 山东师范大学 | Vector special correlation partial coherent light beam generation method, measurement method and device |
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