CN102053382B - Speckle elimination device based on Mie scattering and optical device - Google Patents
Speckle elimination device based on Mie scattering and optical device Download PDFInfo
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- CN102053382B CN102053382B CN 201110031496 CN201110031496A CN102053382B CN 102053382 B CN102053382 B CN 102053382B CN 201110031496 CN201110031496 CN 201110031496 CN 201110031496 A CN201110031496 A CN 201110031496A CN 102053382 B CN102053382 B CN 102053382B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
- G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
Abstract
The invention discloses a speckle elimination device based on Mie scattering and an optical device, relating to the technical field of display by taking coherent light as a light source; and the device provided by the invention can be used for solving the problems of poor speckle elimination effect, complex realization structure, high possibility of damaging, high cost and the like of the existing speckle elimination method. The speckle elimination device comprises an optical reflection cavity and the optical device, wherein the optical reflection cavity is provided with an incident light coupling device and a transmission outgoing surface; the optical device is over against the incident light coupling device of the optical reflection cavity and can change the incident angle of a light beam when the light beam enters the incident light coupling device of the optical reflection cavity; the inner walls, expect the inner wall of the transmission outgoing surface, of the optical reflection cavity are all 'mirror surface' inner walls; the optical reflection cavity is filled with a transparent solid matter; and medium particles the linearity of which can cause incident laser to be subjected to Mie scattering are scattered in the transparent solid matter. The speckle elimination device has the advantages of simple and compact structure, good speckle elimination effect, high laser utilization ratio, stable performance, safety, reliability and light homogenizing ability.
Description
Technical field
The present invention relates to the display technique field take coherent light as light source, a kind of speckle eliminating device based on Mie scattering and optical device specifically is mainly for the optics speckle phenomena that exists in laser display technology and optical instrument.
Background technology
During take laser as the light source irradiation screen, coarse due to the coherence of laser and screen causes human eye to see the image that is covered by speckle, has a strong impact on image displaying quality, hinders the observer and extract useful information from image.Therefore, how to eliminate speckle is optical instrument field take laser as light source and the research and development focus in the display technique field always.And with regard to present result of study, roughly can be divided into two large classes for eliminating speckle method used: one, reduce speckle by the temporal coherence of controlling LASER Light Source, its principle is to produce boiling speckles by adjusting optical maser wavelength (perhaps frequency) and multi wave length illuminating source, successfully eliminates the technical scheme that hot spot reaches real requirement and basically is superposed to the master with multiple light courcess by controlling the Laser Time coherence at present; Two, eliminate speckle by controlling the laser beam space coherence, it is the main method of eliminating at present speckle, ultimate principle is to adjust the PHASE DISTRIBUTION of primitive light wave in laser beam, thereby change the space distribution of speckle, a plurality of speckle images are superimposed in integral time at human eye, obtain the image that a luminous energy is evenly distributed, and then realize eliminating the purpose of speckle.Concrete method has: adopt rotation scatterer, vibration screen, vibration to have Hadamard figure scatterer, dither optical fiber etc.Said method, or to even need high frequency or Large Amplitude Vibration by mechanical vibration, or want integrated multiple light courcess, implementation structure is complicated, fragile, cost is high, and main is that the speckle eradicating efficacy is not good.
Technical scheme by mechanical vibration is also arranged not, for example: the patent No. is that 200820122639.7 Chinese patent discloses " a kind of decohering and shimming device based on scattering ", require to use contain diameter must be less than the scattering medium of the particle of lambda1-wavelength 1/10th, to realize that incident laser is formed Rayleigh scattering.Utilize inorganic salts or Organic Alcohol aqueous solution (as NaCl, KCl, KNO in patent
3Or ZnSO
4Aqueous solution) as scattering medium, existence form based on inorganic salts or Organic Alcohol aqueous solution is hydrated ion or large molecule, little a lot of with respect to optical maser wavelength, can form Rayleigh scattering to incident laser, realize the incident laser beam splitting with this, and conduct in photoconductive tube, eliminate speckle to the coherence who reduces incident laser, utilize simultaneously the mixed light effect of photoconductive tube, above-mentioned beam splitting light is carried out homogenize come the shimming eliminating coherence.But test by the described technical method of this application, at room temperature, utilize length to eliminate speckle for 50mm, the photoconductive tube that is full of saturated NaCl aqueous solution, result as shown in Figure 1, its speckle contrast is 70%, does not almost play the effect that reduces speckle.
Summary of the invention
The present invention is complicated, fragile for the elimination speckle poor effect, the implementation structure that solve existing speckle removing method existence, the high in cost of production problem, and a kind of speckle eliminating device based on Mie scattering and optical device is provided.
The present invention adopts following technical scheme to realize: based on the speckle eliminating device of Mie scattering and optical device, and the optical device that comprises the optical reflection chamber which is provided with incident light coupling device and transmission exit facet, arranges over against optical reflection chamber incident light coupling device; Described optical device is the optical device of the incident angle in the time of changing light beam beam incident optical reflection cavity incident light coupling device; It (is that inwall has the high reflectance characteristic that the inwall of optical reflection chamber except transmission exit facet inwall is all " minute surface " inwall, can " total reflection " be incident in the laser beam in the optical reflection chamber), be provided with the transparent solid matter that fills up whole optical reflection chamber in the optical reflection chamber, and be scattered with the insulating particles that its dimension can cause incident laser generation Mie scattering in transparent solid matter.
Described optical device can adopt scanning micro-mirror or variable focus microlens.
during application, as Fig. 5, 6, 8, shown in 9, by the laser beam of LASER Light Source emission after optical device (scanning micro-mirror or variable focus microlens) modulation, passing incident light coupling device on the optical reflection chamber with different incidence angles incides in transparent solid matter in the optical reflection chamber, with the insulating particles effect generation Mie scattering of scattering in transparent solid matter (as shown in Figure 4, when Mie scattering occurs in incident laser 101 irradiation insulating particles 402, scattered light light distribution after incident laser 101 scatterings is in a very wide angular range, mainly concentrate on forward scattering light 104, 105, 106, generally account for total scattering more than 90%, 102 of rear orientation lights account for very fraction, usually less than 10%, scattered light 105 light intensity along the incident laser working direction are the strongest, the scattered light 103 of vertical direction, 107 the most weak, therefore incident laser is after insulating particles 402 scatterings, be beamed into the scattered light that a plurality of intensity do not wait, the scattered light scattering angular distribution enlarges simultaneously), be beamed into the scattered light that a plurality of intensity do not wait, or reflect through the optical reflection cavity wall, or again with transparent solid matter in the insulating particles effect generation Mie scattering of scattering, the scattered light beam splitting is more scattered light, after Mie scattering repeatedly, by the transmission exit facet outgoing in optical reflection chamber, and the incident angle of optical device when making laser beam beam incident optical reflection cavity changes continuously, cause each constantly incident laser light beam through the scattered light direction of propagation, path change in transparent solid matter that scattering obtains, finally in PHASE DISTRIBUTION, the scattering angular distribution random variation of the scattered light of optical reflection chamber exit facet outgoing.And in the same time outgoing scattered light does not have different PHASE DISTRIBUTION, scattering angular distribution, after projection, can correspondingly produce a speckle image respectively; In human eye integral time (50ms), a plurality of speckle images are superimposed, can obtain the image that a luminous energy is evenly distributed, and then realized eliminating the purpose of speckle phenomena.
Compared with prior art, the present invention arranges the optical reflection chamber, in the optical reflection chamber, incident laser is carried out Mie scattering, carry out the scattering beam splitting, and continuously change the angle of laser beam incident optical reflection cavity with optical device, and then the direction of propagation and the path of randomly changing scattered beam in the optical reflection chamber, make optical reflection chamber exit facet at the scattered light of different time with different PHASE DISTRIBUTION and scattering angular distribution outgoing incident laser; Thereby produce the space distribution of speckle after the change projection, make a plurality of speckle images superimposed in integral time at human eye, obtain the image that a luminous energy is evenly distributed, and then effectively eliminate speckle.And through experimental test, after using device of the present invention, the speckle contrast of image can be lower than 4%, and as shown in Fig. 7,10, the speckle contrast of image reaches respectively 3.72% and 3.91%, and the speckle eradicating efficacy is fabulous; And can improve the speckle eradicating efficacy by the insulating particles concentration in the transparent solid matter of raising and the modulation condition (as: scanning micro-mirror angle amplitude of variation, variable focus microlens focal length variations amplitude) of optical device; The present invention carries out " total reflection " to incident laser in the optical reflection chamber, the overall light loss of energy of incident laser is very little, has guaranteed the high usage of laser, and has realized even smooth purpose in " total reflection " process; Each ingredient of device of the present invention is solid-state, does not have the problems such as leak of liquid, suspending liquid sedimentation, and stable performance is safe and reliable.
The present invention is rational in infrastructure, compact, and the speckle eradicating efficacy is good, and the laser utilization factor is high, and stable performance is safe and reliable, and has even smooth function.
Description of drawings
Fig. 1 utilizes a prior art to eliminate the test result figure that speckle obtains;
Fig. 2 is a kind of structural representation of the present invention;
Fig. 3 is another kind of structural representation of the present invention;
Fig. 4 is the light intensity angle distribution plan of Mie scattering;
Fig. 5 is the scanning micro-mirror view of device of the present invention during incident laser at an angle;
Fig. 6 is the view of device of the present invention after scanning micro-mirror change incident laser incident angle;
Fig. 7 is for utilizing device shown in Figure 2 to eliminate the test result figure that speckle obtains;
Fig. 8 is the view of variable focus microlens device of the present invention during with a certain focal length incident laser;
Fig. 9 is the view of device of the present invention after variable focus microlens varifocal incident laser;
Figure 10 utilizes device shown in Figure 3 to eliminate the test result figure that speckle obtains;
Figure 11 is for adopting the application schematic diagram of device shown in Figure 2 in the spot scan display system;
Figure 12 is for adopting the application schematic diagram of device shown in Figure 3 in the full frame display system;
In figure: the 101-incident laser; 102,103,104,105,106,107-scattered light;
The 300-speckle eliminating device; 301-incident light coupling device; 302-optical reflection chamber; 303-transmission exit facet; The 304-entrance pupil; 305,306,307-speckle eliminating device; The 308-optical device;
The transparent solid matter of 401-; The 402-insulating particles;
501,502,503-laser instrument; 504,505,506-mirror;
601,602,603-signal source;
The 700-lens; The 701-relay lens; 702-photomodulator DLP; The 703-TIR prism; The 704-relay lens; The 705-TIR prism; 706-photomodulator DLP; The 707-relay lens; The 708-level crossing; The 709-TIR prism; 710-photomodulator DLP; The 711-prism; 712-micro scanning mirror;
The 800-screen.
Embodiment
As shown in Fig. 2,3, based on the speckle eliminating device of Mie scattering and optical device, the optical device 308 that comprises the optical reflection chamber 302 which is provided with incident light coupling device 301 and transmission exit facet 303, arranges over against optical reflection chamber 302 incident light coupling devices 301; Described optical device 308 is the optical device of the incident angle in the time of changing light beam beam incident optical reflection cavity 302 incident light coupling device 301; It (is that inwall has the high reflectance characteristic that the inwall of optical reflection chamber 302 except transmission exit facet 301 inwalls is all " minute surface " inwall, can " total reflection " be incident in the laser beam in the optical reflection chamber), be provided with the transparent solid matter 401 that fills up whole optical reflection chamber 302 in optical reflection chamber 302, and be scattered with the insulating particles 402 that its dimension can cause incident laser generation Mie scattering in transparent solid matter 401.Described optical device 308 can adopt scanning micro-mirror or variable focus microlens.
During concrete enforcement, described scanning micro-mirror adopts one-dimensional scanning micro mirror or two-dimensional scan micro mirror all can; Described variable focus microlens adopts varifocal convex lens or varifocal concavees lens all can; Described transparent solid matter 401 should be the transparent solid matter of incident laser without transmission loss, as: high-molecular gel etc.; Described insulating particles 402 can adopt polystyrene microsphere, TiO 2 particles (TiO
2) etc. insulating particles; Described optical reflection chamber 302 multiselects are made of metal, level crossing, transparent plastic or glass processing, and its shape need not to be particularly limited, the general tubular housings that adopt more; Transmission exit facet 303 multiselects in optical reflection chamber 302 are made of transparent plastic or glass processing, and mostly are rectangle plane, and the surface is provided with the anti-reflection film that mates with the incident beam wave band.Incident light coupling device 301 on described optical reflection chamber 302 can be realized by following structure: adopt the transmission plane of incidence, and be provided with the anti-reflection film that mates with the incident beam wave band on the surface; Perhaps adopt the entrance pupil structure, also can be equipped with optical coupling element on entrance pupil 304, as: lens.
Speckle eliminating device of the present invention can be applied in laser projection display technology, for example: as shown in figure 11, be applied to spot scan projection (Raster-Scanned Displays) system, signal source 601,602,603 is modulated respectively tricolor laser device 501,502,503 output powers according to the information of each pixel on two dimensional image; Three incident lasers are derived in exit facet after modulation by mirror 504,505,506 coupling incident speckle eliminating devices 300 of the present invention, and scioptics 700 and micro scanning mirror (Scan Mirror) 701 projects to screen 800.Under the driving of electric signal, micro scanning mirror 701 pursues picture element scan to screen according to two dimensional image.Laser-projector and laser television that this application example is applicable to spot scan show.
As shown in figure 12, be applied to full frame Display projector (Full-Frame Displays) system, tricolor laser device 501,502,503 output firm power laser beams, coupling imports speckle eliminating devices 305 of the present invention, 306,307 respectively; After modulation, by relay lens 701,704,707, level crossing 708 and TIR prism 703,705,709 converge to photomodulator DLP 702,706,710; Photomodulator DLP 702,706,710 generates monochrome image according to every frame 2 dimension image information modulation; Tristimulus image is warm through prism 711, is projected to screen 800 by lens 700.This application example is applicable to based on DMD, and the laser-projector of the optical modulation devices such as LCOS and laser television show.
Claims (5)
1. speckle eliminating device based on Mie scattering and optical device is characterized in that: the optical device (308) that comprises the optical reflection chamber (302) which is provided with incident light coupling device (301) and transmission exit facet (303), arranges over against optical reflection chamber (302) incident light coupling device (301); Described optical device (308) is the optical device of the incident angle in the time of changing light beam beam incident optical reflection cavity (302) incident light coupling device (301); The inwall of optical reflection chamber (302) except transmission exit facet (303) inwall all has the high reflectance characteristic, be provided with the transparent solid matter (401) that fills up whole optical reflection chamber (302) in optical reflection chamber (302), and be scattered with the insulating particles (402) that its dimension can cause incident laser generation Mie scattering in transparent solid matter (401).
2. the speckle eliminating device based on Mie scattering and scanning micro-mirror according to claim 1 is characterized in that: transmission exit facet (303) surface in optical reflection chamber (302) is provided with the anti-reflection film with incident beam wave band coupling.
3. the speckle eliminating device based on Mie scattering and scanning micro-mirror according to claim 1, it is characterized in that: described optical device (308) can adopt scanning micro-mirror or variable focus microlens.
4. the speckle eliminating device based on Mie scattering and scanning micro-mirror according to claim 1 is characterized in that: described transparent solid matter (401) is for to the transparent solid matter of incident laser without transmission loss.
5. the speckle eliminating device based on Mie scattering and scanning micro-mirror according to claim 1, is characterized in that: described insulating particles (402) employing polystyrene microsphere or TiO 2 particles.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110031496 CN102053382B (en) | 2011-01-29 | 2011-01-29 | Speckle elimination device based on Mie scattering and optical device |
| PCT/CN2012/000042 WO2012100643A1 (en) | 2011-01-29 | 2012-01-10 | Speckle removal device based on mie scattering and optical part |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110031496 CN102053382B (en) | 2011-01-29 | 2011-01-29 | Speckle elimination device based on Mie scattering and optical device |
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| CN102053382A CN102053382A (en) | 2011-05-11 |
| CN102053382B true CN102053382B (en) | 2013-06-05 |
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| WO (1) | WO2012100643A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053382B (en) * | 2011-01-29 | 2013-06-05 | 中北大学 | Speckle elimination device based on Mie scattering and optical device |
| CN109870830B (en) | 2017-12-04 | 2021-07-27 | 上海飞博激光科技有限公司 | Element for decoherence of light beam |
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| WO2012100643A1 (en) | 2012-08-02 |
| CN102053382A (en) | 2011-05-11 |
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