CN201285473Y - Decoherent and field equalizing apparatus based on diffusion - Google Patents

Decoherent and field equalizing apparatus based on diffusion Download PDF

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Publication number
CN201285473Y
CN201285473Y CNU2008201226397U CN200820122639U CN201285473Y CN 201285473 Y CN201285473 Y CN 201285473Y CN U2008201226397 U CNU2008201226397 U CN U2008201226397U CN 200820122639 U CN200820122639 U CN 200820122639U CN 201285473 Y CN201285473 Y CN 201285473Y
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China
Prior art keywords
laser
light
decohering
shimming device
hollow waveguide
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Expired - Fee Related
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CNU2008201226397U
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Chinese (zh)
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成华
毕勇
颜世鹏
贾中达
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Beijing Phoebus Vision Optoelectronic Co ltd
Academy of Opto Electronics of CAS
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Beijing Phoebus Vision Optoelectronic Co ltd
Academy of Opto Electronics of CAS
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Priority to CNU2008201226397U priority Critical patent/CN201285473Y/en
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Abstract

The utility model provides a decoherence shimming device for lasers, which comprises a hollow wave guide and scattering mediums. The hollow wave guide is a seal chamber for containing the scattering mediums and guiding lasers. The decoherence shimming device can split the lasers by means of the rayleigh scattering of the scattering mediums to the lasers when the lasers spread in the scattering mediums, and can homogenize the split lasers through the light mixing effect of the wave guide; and finally lasers with low coherence and uniform lamination distribution are obtained. The decoherence shimming device can simultaneously realize decoherence and shimming, and has high laser utilization, low cost, no noise and no power consumption.

Description

A kind of decohering and shimming device based on scattering
Technical field
The utility model relates to the laser display field, is specifically related to a kind of decohering and shimming device based on scattering.
Background technology
Because the coherence of laser causes the display frame speckle phenomena serious, influence onlooker's impression, this problem has become the technical barrier that the laser display field must overcome.
Publication number be the patent of invention of CN1879057 utilize in the light diffusion unit shake or vibrate or the scattering particles that flow to the laser effect, make the speckle image that produces from the laser of light diffusion unit transmission change in time, make eye-observation arrive the speckle image of stack, so speckle phenomena is not obvious.But this device is very low to the utilization factor of laser, the utilization factor of its preferred version only about 25%; And this scheme is equipped with strict restriction to the space bit between light source, light diffusion unit and the optical modulation element, and installation and maintenance is all had higher requirements; In addition, owing to need in addition if scattering particles or the device that shakes or vibrate or flow make that the whole proposal design is complicated, with high costs.
Publication number is that the patent of invention of CN101078869 is provided with flow circuits in the display system screen, and filling can be to the liquid or the gas of laser light scattering in flow circuits, and make liquid or gas be in flow state, make the observer see the speckle image of elapsed time equalization, reach the effect of dissipation spot, but the manufacturing of the screen in this method is very complicated, cost is very high, but also need to be provided with the pump that impels described liquid or gas flow, introduce the noise of not expecting and increase power consumption.
Summary of the invention
Therefore, in order to overcome the prior art deficiency, the utility model provides a kind of device that can realize eliminating coherence and shimming functions simultaneously.
The utility model provides a kind of decohering and shimming device that is used for laser, comprise hollow waveguide and scattering medium, wherein, described scattering medium is applicable to carries out Rayleigh scattering to described laser, and described hollow waveguide is that seal chamber is to hold described scattering medium and described laser is carried out conduction.
Decohering and shimming device in the technique scheme, wherein said hollow waveguide comprise sidewall and light entrance face, light-emitting face, and described sidewall is applicable to the described laser of reflection; Described light entrance face and light-emitting face are positioned at the end of described hollow waveguide, are applicable to the described laser of transmission.
Decohering and shimming device in the technique scheme, wherein said hollow waveguide are straight shape or curved shape.
Decohering and shimming device in the technique scheme, wherein said scattering medium are inorganic salt solution or organism alcoholic solution.
Decohering and shimming device in the technique scheme, wherein said sidewall, light entrance face and light-emitting face are made by transparent plastic or glass.
Decohering and shimming device in the technique scheme, wherein said inside surface of side wall or outside surface are coated with the total reflection film at the wave band of described laser.
Decohering and shimming device in the technique scheme, the refractive index of wherein said sidewall is less than the refractive index of described scattering medium.
Decohering and shimming device in the technique scheme, two logical light faces of wherein said light entrance face and two logical light faces of light-emitting face all are coated with the anti-reflection film at the wave band of described laser.
Decohering and shimming device in the technique scheme, wherein said transparent plastic are teflon.
Decohering and shimming device in the technique scheme, the shape of cross section of wherein said hollow waveguide are rectangle or circle.
Decohering and shimming device in the technique scheme, wherein said scattering medium are NaCl, KCl, KNO 3Or ZnSO 4Aqueous solution.
The beneficial effects of the utility model are:
1. can realize eliminating coherence and shimming functions simultaneously.Described waveguide has the shimming effect to laser, add the above scattering medium incident laser is carried out Rayleigh scattering, the relative incident laser of scattered light that forms is depolarization to some extent, scattered light is propagated in waveguide through different light path outgoing, therefore the degree of polarization of outgoing beam and phase place with respect to incident laser greatly for a change, its degree of coherence greatly weakens.So the utility model device can be realized the function of eliminating coherence and shimming simultaneously to laser.
2. laser utilization factor height.Because Rayleigh scattering do not absorb luminous energy, consider that again scattering medium can adopt the material minimum to laser absorption, and described waveguide is in the process of propagated laser, light leak is few, can make the utilization factor of laser up to 90% usually.
3. simple in structure, with low cost.What the utility model device adopted all is common material and common structure, all very low on material cost and processing cost, and corresponding, alternative costs are also very low.
4. noiselessness, not power consumption.The utility model device is static modulation, and not drawing-in system noise, and not power consumption in the operational process is a kind of desirable environmental protection solution.
Description of drawings
Below, describe embodiment of the present utility model in conjunction with the accompanying drawings in detail, wherein:
Fig. 1 is the diagrammatic cross-section of an embodiment of the utility model device.
Fig. 2 is the diagrammatic cross-section of another embodiment of the utility model device.
Fig. 3 is for being used for the utility model device of embodiment 1 synoptic diagram of a kind of embodiment of one chip DLP laser projection system.
Fig. 4 is for being used for the utility model device among the embodiment 1 synoptic diagram of a kind of embodiment of three-chip type DLP laser projection system.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is further described.
The utility model utilizes internal layer to be filled with the hollow waveguide transmission laser of scattering medium, utilize Rayleigh scattering that scattering medium in the communication process takes place laser with laser beam splitter and utilize the mixed light effect of waveguide that above-mentioned beam splitting light is carried out homogenize, finally obtain the coherence and effectively reduce and the uniform laser beam of Illumination Distribution.
At first the characteristics of Rayleigh scattering are made brief description.Rayleigh scattering is to be caused by the particulate of dimension less than lambda1-wavelength 1/10th, and Rayleigh scattering does not absorb luminous energy, and the scattered light wavelength is identical with lambda1-wavelength.Becoming on the direction at θ angle with the incident light direction of propagation, scattered light intensity is in the unit scattering medium (solution, flue dust or other materials that include scattering particles)
I θ = α N 0 V 2 r 2 λ 2 I 0 ( 1 + cos 2 θ )
Wherein α characterizes the non-uniform degree of scattering medium, N 0Be the number of scattering particles in the unit volume scattering medium, V is the volume of scattering particles, and r is the distances of scattering particles to observation point, and λ is the incident light wavelength, I 0Light intensity for incident light.
Therefore, theory according to above-mentioned Rayleigh scattering, the biquadratic that can know scattered intensity and lambda1-wavelength is inversely proportional to, promptly under the certain situation of other conditions, the degree that short wavelength's incident light is scattered is higher, and the density of scattering particles is big more, the scattering particles volume big more (diameter must less than lambda1-wavelength 1/10th), the scattering power of scattering medium strong more (be that the light that is scattered of incident light is many more, it is few more to continue the light propagated along former direction) then.
It can also be seen that therefrom the scattered light of Rayleigh scattering is distributed with following rule at the angle in space: with the more little direction in incident light angular separation on, scattered intensity is big more, on the direction vertical with incident light, it is minimum that scattered light intensity reaches.Therefore, most of scattered light is concentrated and is distributed near the incident light direction.
Rayleigh scattering also has characteristics, promptly when incident light be linearly polarized light and scattering particles when being anisotropy, the depolarization phenomenon can appear in scattered light, promptly scattered light is a partial poolarized light; When incident light is the partial polarization light time, the scattered light on the different directions is a partial poolarized light still, but has the degree of polarization different with incident light, and the degree of polarization between the scattered light is different.
Embodiment 1:
Fig. 1 is the diagrammatic cross-section of an embodiment of the utility model device.As shown in Figure 1, the decohering and shimming device in the present embodiment comprises the hollow waveguide 102 and the filling NaCl aqueous solution within it of straight shape.Wherein hollow waveguide 102 comprises sidewall 101, light entrance face 108 and light-emitting face 111.Because the laser after the utility model device is handled is generally used for shining rectangular light valve, so the xsect of hollow waveguide 102 preferably adopts rectangle.The sidewall 101 of hollow waveguide 102 is corrosion-resistant and absorb the luminous energy less material and make by glass or transparent plastic (for example teflon) etc., and the inwall flatness of sidewall 101 does not have specific (special) requirements, does not therefore cause the difficulty in the processing.(solvent is a distilled water to be filled with the NaCl aqueous solution in the chamber of hollow waveguide 102, solute is analytically pure NaCl), 102 liang of bottom surfaces of hollow waveguide are sealed by light entrance face 108, light-emitting face 111, light entrance face 108 and light-emitting face 111 are made by transmission substances such as glass or transparent plastics, its shape is not limit, its area should be slightly larger than two bottom surfaces (can cover the bottom surface fully gets final product) of hollow waveguide 102, and two logical light faces of light entrance face 108 and two logical light faces of light-emitting face 111 all are coated with the anti-reflection film at the wavelength of incident beam 104.The refractive index of NaCl aqueous solution should be greater than the refractive index of the material of sidewall 101, and the difference of above-mentioned both refractive indexes is the bigger the better, and (refractive index difference is big more, the numerical aperture that means waveguide is big more, the ability that receives incident light is just strong more, the refractive index in the present embodiment all refer to material at the wavelength place of incident beam 104 refractive index with respect to vacuum).
Incident beam 104 is the laser with visible light wave range of coherence, and it is coupled in the hollow waveguide 102 with focus version, and propagates Na in the NaCl aqueous solution forward +Ion or Cl -The dimension of ion (being referred to as ion 103) is all less than 10nm, usually the wavelength of incident beam 104 is between 400～780nm, obviously the dimension of ion 103 is less than 1/10th of the wavelength of incident beam 104, Rayleigh scattering (Rayleigh Scattering) takes place when for example light beam 105 runs into ion 103 in part light beam, produces the scattered light of propagating along the space all directions.Wherein first scattered light 106 and the incident angle of light beam 107 on sidewall 101 propagated along former direction are greater than the angle of total reflection, and the incident angle of second scattered light 110 on sidewall 101 is less than the angle of total reflection, total reflection takes place when first scattered light 106 and light beam 107 run into sidewall 101 to be continued to propagate forward, the 110 a part of reflected back waveguides of second scattered light continue to propagate forward formation scattered light 113, a part then transmits bend loss and falls, the theory that is distributed by the angle of above-mentioned Rayleigh scattering as can be known, the luminous energy that loses so only accounts for the minimum part of incident beam, and what be distributed in that near the direction of propagation of incident beam 104 most of scattered light takes place on sidewall 101 is total reflection.Owing to be covered with ion 103 in the NaCl aqueous solution, light beam in the chamber constantly runs into ion 103 and Rayleigh scattering takes place, Rayleigh scattering of every generation, light beam just is divided into some bundle beamlets and disperses to the space all directions, based on Rayleigh scattering principle, when scattering particles are anisotropy, the beamlet that each scattering obtains all have in various degree depolarization or the change of degree of polarization, these beamlets mix again through the outgoing end face in hollow waveguide 102 behind the different light paths, finally form irradiating light beam 109, compare the incident beam 104 of linear polarization, outgoing beam 109 is depolarization to some extent, in the said process because phase differential between the beamlet that the light path difference causes and the coherence who has all greatly weakened incident beam 104 with respect to the depolarization of incident beam.
On the other hand, just can reach the effect of shimming (promptly obtaining the uniform laser beam of illuminance) at the outgoing end face with the rectangular hollow waveguide 102 of not filling the NaCl aqueous solution (being actually a kind of of condenser) transmission laser itself, add the scattering process of NaCl aqueous solution intermediate ion 103, the shimming better effects if of light beam that makes in hollow waveguide 102 transmission is so adopt the device in the present embodiment can finish eliminating coherence and two functions of shimming simultaneously.
Another significant advantage of the utility model is little to the loss of laser, because Rayleigh scattering does not absorb luminous energy, consider that again the NaCl aqueous solution is minimum to the absorption of incident beam 104, add the sidewall transmitted light of negligible minute quantity, the energy of the light beam 109 of final outgoing end face generally can reach 90% of incident beam 104.Certainly, if plate high-reflecting film at the incident beam wave band at sidewall 101 outside surfaces, the utilization factor of laser can be higher.
To a certain extent, the NaCl concentration of aqueous solution in the utility model device is high more, and the effect of eliminating coherence is good more.At first because the concentration of NaCl aqueous solution is high more, its refractive index is also high more, and the difference of the refractive index of itself and side-wall material is also big more, makes the angle of total reflection big more, and is also few more at the scattered light of sidewall generation transmission; Secondly the concentration of NaCl aqueous solution is high more, and the density of effects of ion is big more, and according to the principle of Rayleigh scattering, scattered light intensity is also big more, so the effect of eliminating coherence also can be good more.
Embodiment 2:
Fig. 2 is the diagrammatic cross-section of another embodiment of the utility model device, wherein is filled with KNO in the waveguide 202 of Mi Feng hollow 3Aqueous solution, waveguide 202 is integrated into by glass or transparent plastic, the light entrance face 203 of waveguide 202 and light-emitting face 204 are coated with the anti-reflection film at incident beam 201 wave bands, the sidewall 205 of waveguide 202 is coated with the high-reflecting film at incident beam 201 wave bands, all films all are plated in the outside surface of waveguide 202, can certainly be plated in the inside surface of waveguide 202, being this mode has higher requirements to the decay resistance of rete.Light beam runs into sidewall 205 outside surfaces when propagating in waveguide 202 high-reflecting film reflects.Waveguide 202 is bending shapes back and forth as shown in Figure 2, its xsect is circular, waveguide 202 is designed to back and forth bending shape and has saved the space, and waveguide 202 also can be other bending shape, in addition waveguide 202 can be spatially in the shape of a spiral around or knotting.The diameter of waveguide 202 xsects is preferably equal, also can be unequal, as long as waveguide 202 can be realized the leaded light effect.Eliminating coherence and shimming principle based on identical with embodiment 1 obtain the extremely low and equally distributed outgoing beam 206 of illuminance of coherence at light exit side face 204.
In addition, experiment shows, the suitable bending of waveguide in the utility model also has a certain upgrade to the effect of eliminating coherence, this is because the bending of waveguide has further strengthened the optical path difference between each light beam, and these light beams are more chaotic after the phase relation ratio at light-emitting face place is handled by the straight shape waveguide among the embodiment 1.
Because the outside surface of the sidewall 205 of waveguide 202 is coated with high-reflecting film, so do not require KNO 3The refractive index of aqueous solution is greater than the refractive index of outer wall materials, and is certain, in the reasonable scope, and KNO 3Aqueous solution is preferably high concentration.
Embodiment 3:
Fig. 3 is for being used for the utility model device of embodiment 1 synoptic diagram of a kind of embodiment of one chip DLP laser projection system.Wherein red laser 301 forms in the chamber of hollow waveguide 304 that focused beams are coupled into rectangle through ruddiness apparatus for shaping 311 backs, and green (light) laser 302 and blue laser 303 also are coupled in the chamber of hollow waveguide 304 through forming focused beam behind the apparatus for shaping separately respectively.Be filled with the NaCl aqueous solution in the chamber of hollow waveguide 304, extremely low and illuminance is even from the light beam coherence of hollow waveguide 304 outgoing.Because hollow waveguide 304 cross sections are rectangle, so above-mentioned outgoing beam is a rectangle, form fit with the DMD light valve 308 of rectangle, but its angle of divergence is bigger, generally be not directly used in illumination DMD light valve 308, therefore need to use relay lens 305 with its angle of divergence compression (shaping technique that a kind of those of ordinary skills know), and through imaging in DMD light valve 308 places behind TIR prism 307 (the total internalreflection), DMD light valve 308 cooperates tricolor laser device time division multiplexes ground that the laser of incident on it is modulated, and the image of its generation projects on the screen 310 through projecting lens 309 and shows.
Embodiment 4:
Fig. 4 is for being used for the utility model device among the embodiment 1 synoptic diagram of a kind of embodiment of three-chip type DLP laser projection system.The tricolor laser device is made up of red laser 301, green (light) laser 302 and blue laser 303.Wherein green (light) laser 302 is coupled in the chamber of rectangular hollow waveguide 405 through apparatus for shaping 404 formation focused beams, be filled with the NaCl aqueous solution in the chamber of hollow waveguide 405, extremely low and illuminance is even from the light beam coherence of hollow waveguide 405 outgoing, based on embodiment 3 in identical reason, need and behind TIR prism 414, image in green glow DMD light valve 410 through the relay lens 406 compression angles of divergence from the light beam of hollow waveguide 405 outgoing, the said process and the green glow of ruddiness and blue light are similar, they are respectively through behind the DMD light valve separately, close look at X-cube prism 411 and green glow and form coloured image, the coloured image after will synthesizing by projecting lens 412 afterwards projects on the screen 413.
The above-mentioned hollow waveguide that is used to transmit laser should by corrosion-resistant, the few material of light absorption is made, based on the consideration of easy the to be acquired and cost aspect of material, the hollow waveguide in the foregoing description preferably adopts glass or teflon to make.The solution of filling in the hollow waveguide is not limited to NaCl and KNO 3Aqueous solution, can also be the aqueous solution or the alcoholic solution of other kind, for example KCl, ZnSO 4And so on the aqueous solution of water-soluble inorganic salts, or organic ethanolic solution everyly in a word can bring the scatterer of enough scattering effects all can to laser.In addition, the light valve form fit that the cross sectional shape of hollow waveguide preferably throws light on needs, therefore when light valve is other shapes, also can make corresponding change to the shape of hollow waveguide, for example circular light valve is adopted circular waveguide, the optical fiber that modal circular hollow waveguide is exactly a hollow (have only covering, do not have the optical fiber of fibre core).
Do not produce noise in the utility model device course of work, also not power consumption is a kind of eliminating coherence scheme of desirable tranquility environmental protection.
It should be noted last that above embodiment is only unrestricted in order to the explanation the technical solution of the utility model.Although the utility model is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, the technical solution of the utility model is made amendment or is equal to replacement, the spirit and scope that do not break away from technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims (11)

1. decohering and shimming device that is used for laser, comprise hollow waveguide and scattering medium, wherein, described scattering medium is applicable to carries out Rayleigh scattering to described laser, and described hollow waveguide is that seal chamber is to hold described scattering medium and described laser is carried out conduction.
2. the described decohering and shimming device that is used for laser of claim 1, wherein said hollow waveguide comprise sidewall and light entrance face, light-emitting face, and described sidewall is applicable to the described laser of reflection; Described light entrance face and light-emitting face are positioned at the end of described hollow waveguide, are applicable to the described laser of transmission.
3. the described decohering and shimming device that is used for laser of claim 1, wherein said hollow waveguide is straight shape or curved shape.
4. the described decohering and shimming device that is used for laser of one of claim 1-3, wherein said scattering medium is inorganic salt solution or organism alcoholic solution.
5. the described decohering and shimming device that is used for laser of claim 2, wherein said sidewall, light entrance face and light-emitting face are made by transparent plastic or glass.
6. the described decohering and shimming device that is used for laser of claim 2, wherein said inside surface of side wall or outside surface are coated with the total reflection film at the wave band of described laser.
7. the described decohering and shimming device that is used for laser of claim 2, the refractive index of wherein said sidewall is less than the refractive index of described scattering medium.
8. the described decohering and shimming device that is used for laser of claim 2, two logical light faces of wherein said light entrance face and two logical light faces of light-emitting face all are coated with the anti-reflection film at the wave band of described laser.
9. the described decohering and shimming device that is used for laser of claim 5, wherein said transparent plastic is a teflon.
10. the described decohering and shimming device that is used for laser of claim 1, the shape of cross section of wherein said hollow waveguide is rectangle or circle.
11. the described decohering and shimming device that is used for laser of claim 4, wherein said inorganic salt solution is NaCl, KCl, KNO 3Or ZnSO 4Aqueous solution.
CNU2008201226397U 2008-09-22 2008-09-22 Decoherent and field equalizing apparatus based on diffusion Expired - Fee Related CN201285473Y (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102062953A (en) * 2011-01-29 2011-05-18 中北大学 Speckle eliminator based on Mie scattering and magnetic control particle motion
CN102073146A (en) * 2011-01-29 2011-05-25 中北大学 Mie scattering and field-induced deformation polymers-based speckle eliminating device
CN102073145A (en) * 2011-01-29 2011-05-25 中北大学 Speckle elimination device based on Mie scattering and Brownian motion
CN102298219A (en) * 2010-06-23 2011-12-28 北京中视中科光电技术有限公司 Laser speckle elimination device
WO2012100645A1 (en) * 2011-01-29 2012-08-02 中北大学 Speckle removal device based on mie scattering and perturbation drive
WO2012100643A1 (en) * 2011-01-29 2012-08-02 中北大学 Speckle removal device based on mie scattering and optical part
CN108508626A (en) * 2018-03-16 2018-09-07 山西大学 A kind of static diffusion sheet and dissipation spot method of movement scattering particles

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102298219A (en) * 2010-06-23 2011-12-28 北京中视中科光电技术有限公司 Laser speckle elimination device
CN102062953A (en) * 2011-01-29 2011-05-18 中北大学 Speckle eliminator based on Mie scattering and magnetic control particle motion
CN102073146A (en) * 2011-01-29 2011-05-25 中北大学 Mie scattering and field-induced deformation polymers-based speckle eliminating device
CN102073145A (en) * 2011-01-29 2011-05-25 中北大学 Speckle elimination device based on Mie scattering and Brownian motion
CN102073146B (en) * 2011-01-29 2012-07-04 中北大学 Mie scattering and field-induced deformation polymers-based speckle eliminating device
WO2012100645A1 (en) * 2011-01-29 2012-08-02 中北大学 Speckle removal device based on mie scattering and perturbation drive
WO2012100643A1 (en) * 2011-01-29 2012-08-02 中北大学 Speckle removal device based on mie scattering and optical part
WO2012100640A1 (en) * 2011-01-29 2012-08-02 中北大学 Speckle removal device based on mie scattering and brownian motion
US10078229B2 (en) 2011-01-29 2018-09-18 North University Of China Speckle reduction apparatus based on Mie scattering, perturbation drive, and optical reflective chamber
CN108508626A (en) * 2018-03-16 2018-09-07 山西大学 A kind of static diffusion sheet and dissipation spot method of movement scattering particles

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