CN104252047A - Laser projection system with speckle elimination function - Google Patents
Laser projection system with speckle elimination function Download PDFInfo
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- CN104252047A CN104252047A CN201310259800.0A CN201310259800A CN104252047A CN 104252047 A CN104252047 A CN 104252047A CN 201310259800 A CN201310259800 A CN 201310259800A CN 104252047 A CN104252047 A CN 104252047A
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Abstract
The invention relates to a laser projection system with a speckle elimination function. The laser projection system is composed of a plurality of lasers, a beam-combining light homogenizer, a beam expander, a phase diffuser, a light homogenizer, a beam shaping device, a projection chip, a projection lens, and a series of lenses. The plurality of lasers provide light sources for the projection system; the beam-combining light homogenizer enables laser from different lasers to be combined, compressed, and mixed fully; the beam expander carries out beam expanding on the laser that has been processed by combination and light homogenization and project the processes laser to the phase diffuser by the lenses at proper angles; the phase diffuser adds random phases to the laser projected to the phase diffuser according to the spatial positions and the laser is coupled to the light homogenizer at a divergence angle, and full mixing is carried out again; and the beam shaping device integrates the light from the light homogenizer into the light beam consistent to the projection chip and the projection lens is used for projecting an image generated at the projection chip to a screen. According to the invention, the coherence of the laser beams are substantially reduced, thereby realizing the speckle elimination effect; and the projection system can be guaranteed to have the laser energy with enough brightness.
Description
Technical field
The present invention relates to laser the dissipation spot design of the optical projection system being light source, particularly relate to a kind of laser projection system with dissipation spot function.In this laser projection system, eliminate the speckle produced due to the high coherence of laser, to reach the due high image quality of laser display.
Background technology
Laser is a kind of light source having high brightness, launch monochromatic coherent light bundle.These characteristics make laser be suitable for very much the light source of laser display.Laser display can be client and provides high-power illumination and saturated color.But the coherence of laser may cause a kind of phenomenon, is called laser speckle.Such as, laser, by the interference of the coherent light of different surfaces scattering, can form speckle pattern.Therefore, when expectation laser instrument provide there is good color, bright image time, if effectively do not dissipate spot, picture quality can due to laser speckle deterioration.
At present, disclosed various laser to disappear Speckles Technique.Such as, a kind of method is the longitudinal mode number increasing laser instrument, namely increases the live width of laser instrument, reduces laser instrument coherence, to reach the object of dissipation spot.But this method needs to change the characteristic of laser instrument itself, because of instead of all applicable to any laser instrument.The live width of such as diode pumping solid laser (green glow) in the market is just difficult to be increased.
Another kind method is the polarization direction changing laser, to reduce the interference effect of laser, reaches the object of dissipation spot.Such as, see U.S. Patent number US3,633,999, Middle Court, Middle Court, " Removing speckle patterns from objects ", on July 27th, 1970; US4,511,220A, Charles N.Scully, " Laser target speckle eliminator ", Dec 23 nineteen eighty-two; And US7, the people such as 715,084B2, Scott McEldowney, " Retarder-based despeckle device for laser illumination systems ", on April 15th, 2009.But generally, this way is heavier, and the effect of the spot that dissipates is also very limited.
Also have a kind of method to be that laser instrument is lined up array in space, provide space incoherent illumination, to reach the object of dissipation spot.Unfortunately, this method is expensive, and always unfeasible in reality, because many projectors need employing tens, an even hundreds of laser instrument.By so many laser instrument at space arrangement, and all laser is projected all effectively only have centimetres, even sub-centimetres projection chip on, very difficult in reality.
Also have another kind of method to be by producing many different patterns with speckle, and time average is carried out to these patterns, to reduce laser speckle.Such as, a kind of method adopts vibration display screen.But for a large-scale projection screen, this is unpractical.Therefore, more common method is use external optical element, as fan diffuser (such as, see the people such as J.W.Goodman, " Speckle reduction by a moving diffuser in laser projection displays; " Annual Meeting of the Optical Society of America, Rhode Island, 2000), phase-plate (such as, is shown in US Patent No. 6,323,984B1, Jahja I.Trisnadi, " Method and apparatus for reducing laser speckle ", on October 11st, 2000; And US6,747,781B2, Jahja I.Trisnadi, " Method, apparatus, and diffuser for reducing laser speckle ", July 2 calendar year 2001) or random diffraction optical element is (such as, see the people such as L.Wang, " Speckle reduction in laser projection systems by diffractive optical element, " Appl.Opt.37,177-1775 page, 1998).As time goes on, by vibrating or rotating, the pattern of multiple out of phase can be produced.The phase place of fan diffuser also can be controlled by the voltage be added on fan diffuser.Such as, US Patent No. 2008/0106779A1, Mark David Peterson, David Elliott Slobodin, " Laser Despeckle Device ", on October 31st, 2007.Like this, without the need to vibration or Rotational diffusion device itself, the phase place of the laser by fan diffuser can be changed, improve the stability of system.
But the dissipation spot disclosed in document is mainly for single laser instrument (as light source).Because the projector of many high brightness needs employing tens, an even hundreds of laser instrument, so need to adopt new dissipation spot method to realize effective dissipation spot of multiple LASER Light Source.
Summary of the invention
The present invention aims to provide a kind of effective dissipation spot method and has the laser projection system of dissipation spot function, and being applicable to take laser as the optical projection system of light source, is particularly the optical projection system of light source based on multiple laser instrument.
The laser projection system with dissipation spot function according to the present invention is made up of multiple laser instrument 1, conjunction bundle light uniforming device 2, beam expander 3, phase diffusion device 5, light uniforming device 7, beam shaping 8, projection chip 9, projection lens 10 and a series of lens 4,6.Multiple laser instrument provides the light source with enough brightness for optical projection system, close bundle light uniforming device and the laser from various lasers is carried out the compression of conjunction bundle and fully mixing, beam expander by close bundle even light after laser expand according to the size of phase diffusion device, and scioptics with suitable angles on phase diffusion device.Phase diffusion device spatially adds random phase in position to the laser projected on phase diffusion device, and passes through another Lens Coupling in light uniforming device with certain angle of divergence, fully mixes.Beam shaping by from the polishing synthesis of light uniforming device and projection chip shape, hot spot of the same size (being generally square or rectangle), and by projection lens by image projection that projection chip produces to screen.By conjunction bundle of the present invention, even light, expand, phase diffusion, evener photoreduction process, the coherence of laser beam weakens greatly, thus reaches the effect of dissipation spot, and can ensure the laser energy with enough brightness needed for optical projection system.
Accompanying drawing explanation
According to detailed description given below, by reference to the accompanying drawings, the present invention will be more fully understood.In the accompanying drawings:
Fig. 1 is of the present invention based on multiple laser instrument, the first example structure figure (opticator) with the laser projection system of dissipation spot function.
Fig. 2 is the laser projection system second example structure figure with dissipation spot function of the present invention.
Fig. 3 is laser projection system the 3rd example structure figure with dissipation spot function of the present invention.
Fig. 4 is laser projection system the 4th example structure figure with dissipation spot function of the present invention.
Fig. 5 is laser projection system the 5th example structure figure with dissipation spot function of the present invention.
Fig. 6 is laser projection system the 6th example structure figure (closing the even light part of bundle) with dissipation spot function of the present invention.
Fig. 7 is laser projection system the 7th example structure figure with dissipation spot function of the present invention.
Fig. 8 is laser projection system the 8th example structure figure with dissipation spot function of the present invention.
Fig. 9 is laser projection system the 9th example structure figure with dissipation spot function of the present invention.
Embodiment
Fig. 1 schematically shows of the present invention based on multiple laser instrument, the first example structure figure (opticator) with the laser projection system of dissipation spot function.Laser projection system is made up of multiple laser instrument 11, conjunction bundle light uniforming device 12, beam expander 13, phase diffusion device 15, light uniforming device 17, beam shaping 18, projection chip 19, projection lens 10 and a series of lens 14,16.Multiple laser instrument provides the light source with enough brightness for optical projection system, close bundle light uniforming device and the laser from various lasers is carried out the compression of conjunction bundle and fully mixing, beam expander by close bundle even light after laser expand according to the size of phase diffusion device, and scioptics with suitable angles on phase diffusion device.Phase diffusion device spatially adds random phase in position to the laser projected on phase diffusion device, and passes through another Lens Coupling in light uniforming device with certain angle of divergence, fully mixes.Beam shaping 18 by from the polishing synthesis of light uniforming device and projection chip shape, hot spot of the same size (being generally square or rectangle), and by projection lens by image projection that projection chip produces to screen.By conjunction bundle of the present invention, even light, expand, phase diffusion, evener photoreduction process, the coherence of laser beam weakens greatly, thus reaches the effect of dissipation spot, and can ensure the laser energy with enough brightness needed for optical projection system.
The wavelength of laser instrument can be identical (such as 532nm), also can be not identical (such as 635nm, 532nm, 445nm).General single tube RGB laser power is respectively 0.5 watt, 1 watt, 1 watt at present.So in high-brightness projection machine, usually need employing tens, even a hundreds of laser instrument.Projection chip 19 generally adopts the process of monolithic Digital Light Processing(digital light, DLP), 3DLP, Liquid Crystal on Silicon(liquid crystal over silicon, LCOS), or the mode such as 3LCD.Different projection patterns, adopts different light paths usually.Dissipation spot method can carry out respectively three coloured light according to Fig. 1, after then being merged by three-beam, injects projection chip.At this moment, three cover light paths are needed to realize the dissipation spot of three coloured light respectively.Also method can process three coloured light according to Fig. 1 simultaneously.At this moment, a set of light path is only needed to realize the dissipation spot of three coloured light.Phase diffusion device 15 can be transmission-type (as shown in Figure 1), also can be reflection-type.As adopted reflection type phase fan diffuser, parts 16,17,18,19 and 10 need suitably adjustment, effectively to accept the light from the reflection of phase diffusion device or transmission.Understand with being convenient to for convenience, below suppose the wavelength of laser instrument identical (such as 532nm), phase diffusion device 15 is transmission-type.
Now analyze laser by the space phase after each parts, intensity distributions.Before conjunction bundle light uniforming device 12, perpendicular on the cross section of optical axis, because the light of spatial points is from different laser instruments, the beam size of each laser instrument is limited, so intensity distributions is uneven, and have very strong coherence from the phase place of the hot spot of same laser instrument, namely speckle effect is serious.Laser is after closing bundle light uniforming device 12, and the light from different laser instruments is fully mixed, and therefore uniform intensity distribution improves greatly.Any light intensity of space from different laser instruments, but still has very strong coherence from the intense part of same laser instrument, and namely speckle effect still exists.In order to make the light from different laser instruments fully be mixed, closing, the beam diameter in bundle light uniforming device 12 is unsuitable excessive.Therefore, laser is by after conjunction bundle light uniforming device 12, and need be expanded, be collimated by beam expander 13, then scioptics 14 converge on phase diffusion device 15 exactly.Phase diffusion device 15 can regard the multiple cells including n × m matrix as.The phase place of each unit can by the Control of Voltage be added on phase diffusion device 15, and can be irrelevant mutually.Therefore, phase diffusion device 15 can regard a slice random-phase marks as.When laser is by after phase diffusion device 15, any light intensity of space from different laser instruments, and has and puts incoherent phase place with other, and namely the spatial coherence of laser weakens greatly.These laser scioptics 16 with random phase are coupled into after light uniforming device 17 mixes again, and any light intensity of space is existing from various lasers part, have again from same laser instrument but have the part of out of phase.Therefore, the spatial coherence of laser is thoroughly destroyed, and namely speckle effect is eliminated.These light are shaped to after the square or rectangle consistent with projection chip 19 through beam shaping 18, drop into projection chip, produce image, and project screen after being amplified by projection lens 10, form high resolution image (namely passing through the image of dissipation spot).
Fig. 2 schematically shows the structural drawing of second embodiment of the invention.N number of wavelength is that the laser instrument 21 of 532nm forms light source, is arranged on a circular arc 28.Laser from these laser instruments injects beam compressor 22 with different angles.In order to improve the coupling efficiency of laser, the center of the plane of incidence of beam compressor 22 and the center superposition of circular arc.In order to adopt laser instrument as much as possible, the size of the laser instrument of use should be little as far as possible.Such as, 1 watt of mini laser instrument of Nanjing laser green for a long time Science and Technology Ltd. can be used.In addition, the acceptance angle of the beam compressor 22 of use should be large as far as possible.Such as, the acceptance angle of Edmund Optics is the Compound Parabolic Concentrator (compound parabolic concentrator, CPC) of 25 ° or 40 °.Be coupled into light uniforming device 24 from the laser of beam compressor 22 outgoing used through lens 23, carry out light mixing.Afterwards, expand through lens 25, lens 26 enter phase diffusion device 27 after converging.Visible, the beam compressor 22 in the second embodiment, lens 23, light uniforming device 24, be equivalent to the conjunction bundle light uniforming device in the first embodiment, the lens 25 in the second embodiment are equivalent to the beam expander in the first embodiment.
Fig. 3 schematically shows the structural drawing of third embodiment of the invention.N number of wavelength is that the laser instrument 31 of 532nm forms light source, is arranged on a circular arc 38.Laser from these laser instruments injects beam compressor 32 with different angles.In order to improve the coupling efficiency of laser, the center of the plane of incidence of beam compressor 32 and the center superposition of circular arc.In order to adopt laser instrument as much as possible, the size of the laser instrument of use should be little as far as possible.Such as, 1 watt of mini laser instrument of Nanjing laser green for a long time Science and Technology Ltd. can be used.In addition, the acceptance angle of the beam compressor 2 of use should be large as far as possible.Such as, the acceptance angle of Edmund Optics is the Compound Parabolic Concentrator (compound parabolic concentrator, CPC) of 25 ° or 40 °.Expand through lens 33 from the laser of beam compressor 32 outgoing used, after lens 34 converge, enter phase diffusion device 35.Compare in the second embodiment, eliminate light uniforming device in the 3rd embodiment, therefore cost can decrease, but dissipation spot effect can be lower.This structure is comparatively effective to the laser instrument that live width is relatively wide, because the dissipation spot of wide live width laser instrument can be relatively easy.
Fig. 4 schematically shows the structural drawing of fourth embodiment of the invention.N number of wavelength is that the laser instrument 41 of 532nm forms light source, is arranged on a circular arc 48.Laser from these laser instruments injects light uniforming device 42 with different angles.In order to improve the coupling efficiency of laser, the center of the plane of incidence of light uniforming device 42 and the center superposition of circular arc.In order to adopt laser instrument as much as possible, the size of the laser instrument of use should be little as far as possible.Such as, 1 watt of mini laser instrument of Nanjing laser green for a long time Science and Technology Ltd. can be used.In addition, the acceptance angle of the light uniforming device 42 of use should be large as far as possible.Such as, the large-numerical aperture Light Pipe Homogenizing Rod(light pipe homogeneous rod of Edmund Optics).Expand from the laser of light uniforming device 42 outgoing through lens 43, lens 44 converge after, enter phase diffusion device 45.Compared with the second embodiment, eliminate beam compressor in the 3rd embodiment, therefore cost can decrease, but the laser instrument number that can adopt can be a little less.This structures on intensity requires that so not high projecting apparatus system is more effective.
Fig. 5 schematically shows the structural drawing of fifth embodiment of the invention.N number of wavelength is that the laser instrument 51 of 532nm forms light source, is arranged on a circular arc 58.Laser from these laser instruments injects lens 52 with different angles, after lens 53 converge, enters phase diffusion device 54.Compare in the second embodiment, beam compressor and light uniforming device is eliminated in 3rd embodiment, therefore cost can decrease, but the arrangement of laser instrument requires that meeting is very strict, because all laser all must be coupled into the phase diffusion device 54 that diameter only has several millimeters effectively.Further, the laser instrument number of employing can be a little less, and dissipation spot effect can be lower.This structures on intensity requires so not high, and the laser instrument adopting live width relatively wide is more effective as the projecting apparatus system of light source.
Fig. 6 schematically shows the structural drawing of sixth embodiment of the invention.N number of wavelength is that the laser instrument 61 of 532nm forms light source.After these laser instruments are first coupled with multimode optical fiber 62 respectively, then fuse with optical fiber power compositor 63, realize closing bundle.The core diameter of the multimode optical fiber of the input end of optical fiber power compositor 63 is little compared with the core diameter of output terminal multimode optical fiber 64.The input port number of optical fiber power compositor 63 can be 7,19,37 etc., and output port number can be 1,7,19,37 etc.In order to realize the abundant mixing of laser, output terminal adopts the multimode optical fiber that port number is 1, core diameter is less, length is longer, such as core diameter 400 microns, length 5 meters.Compared with the second embodiment, have employed the conjunction that optical fiber power compositor 63 realizes laser in the 6th embodiment and restraint even light, therefore reliability can increase, and the number of lasers can closing bundle can increase, but cost can raise to some extent, and laser energy loss also can raise to some extent.
Fig. 7 schematically shows the structural drawing of seventh embodiment of the invention.The laser instrument that N number of wavelength is 532nm is exported by multimode optical fiber 71 after restrainting even light by the conjunction of optical fiber power compositor shown in the 6th embodiment.From multimode optical fiber 71 export laser through lens 72, by the further even light of taper light uniforming device 73.Because the core diameter of multimode optical fiber less (being generally less than 1 millimeter), should use input aperture little, the taper light uniforming device that outgoing aperture is large.Such as, the Tapered Light Pipe Homogenizing Rod(tapered light pipe homogeneous rod of Edmund Optics).Expanded through lens 74 by the laser of taper light uniforming device 73 outgoing, lens 75 enter phase diffusion device 76 after converging.Compared with the second embodiment, have employed multimode optical fiber 71 and taper light uniforming device more than 73 even light in the 7th embodiment, therefore dissipation spot effect can be better, but cost can raise to some extent.
Fig. 8 schematically shows the structural drawing of eighth embodiment of the invention.The laser instrument that N number of wavelength is 532nm is exported by multimode optical fiber 81 after restrainting even light by the conjunction of optical fiber power compositor shown in the 6th embodiment.The laser exported from multimode optical fiber 81 expands through lens 82,83, and lens 84 enter phase diffusion device 85 after converging.Compared with the 7th embodiment, in the 8th embodiment, eliminate taper light uniforming device, only have employed the even light of multimode optical fiber 81, therefore dissipation spot effect meeting low spot, but cost can decrease.
Fig. 9 schematically shows the structural drawing of ninth embodiment of the invention.The laser instrument that N number of wavelength is 532nm is exported by multimode optical fiber 91 after restrainting even light by the conjunction of optical fiber power compositor shown in the 6th embodiment.The laser exported from multimode optical fiber 91 expands through meniscus 92, convex lens 93, and convex lens 94 enter phase diffusion device 95 after converging.Compared with the 8th embodiment, have employed the mode that meniscus combines, realize expanding.
It is worth mentioning that, the embodiment of foregoing invention should not be considered to have limited significance, and many changes are possible.Such as, phase diffusion device also can be reflection-type.As adopted reflection type phase fan diffuser, only need the position suitably adjusting the optics after phase diffusion device, effectively to accept the light from the reflection of phase diffusion device.
In addition, the dissipation spot method of the embodiment described in foregoing invention to a set of light path is described.Dissipation spot method described in upper invention also can be applied to respectively and overlap light path more.The wavelength often overlapping light path laser instrument can be identical, also can be different.
Further, the embodiment described in upper invention is described the dissipation spot method comprising multiple laser instrument in a set of light path.Dissipation spot method described in upper invention also can be applicable to the light path only comprising single laser instrument.
Pertinent literature:
Patent documentation
US2008/0106779A1, Mark David Peterson, David Elliott Slobodin, " Laser Despeckle Device ", on October 31st, 2007.
US7, the people such as 715,084B2, Scott McEldowney, " Retarder-based despeckle device for laser illumination systems ", on April 15th, 2009.
US3,633,999, Middle Court, Middle Court, " Removing speckle patterns from objects ", on July 27th, 1970.
US4,511,220A, Charles N.Scully, " Laser target speckle eliminator ", Dec 23 nineteen eighty-two.
US6,323,984B1, Jahja I.Trisnadi, " Method and apparatus for reducing laser speckle ", on October 11st, 2000.
US6747781B2, Jahja I.Trisnadi, " Method, apparatus, and diffuser for reducing laser speckle ", July 2 calendar year 2001.
Other documents
The people such as J.W.Goodman, " Speckle reduction by a moving diffuser in laser projection displays, " Annual Meeting of the Optical Society of America, Rhode Island, 2000.
The people such as L.Wang, " Speckle reduction in laser projection systems by diffractive optical element, " Appl.Opt.37,177-1775 page, 1998 years.
Claims (10)
1. there is a laser projection system for dissipation spot function, it is characterized in that, be made up of multiple laser instrument, conjunction bundle light uniforming device, beam expander, phase diffusion device, light uniforming device, beam shaping, projection chip, projection lens and a series of lens.
2. the laser projection system with dissipation spot function according to claim 1, is characterized in that, described laser instrument is made up of the N number of laser instrument be arranged on a circular arc, the center of described circular arc and the described center superposition closing the plane of incidence restrainting light uniforming device.
3. the laser projection system with dissipation spot function according to claim 1, is characterized in that, described conjunction bundle light uniforming device is made up of beam compressor, lens, light uniforming device.
4. the laser projection system with dissipation spot function according to claim 1, is characterized in that, described conjunction bundle light uniforming device is made up of beam compressor and lens.
5. the laser projection system with dissipation spot function according to claim 1, is characterized in that, described conjunction bundle light uniforming device is made up of light uniforming device and lens.
6. the laser projection system with dissipation spot function according to claim 1, is characterized in that, described conjunction bundle light uniforming device is made up of lens.
7. the laser projection system with dissipation spot function according to claim 1, is characterized in that, described conjunction bundle light uniforming device is made up of multimode optical fiber power combiner, lens, taper light uniforming device, lens.
8. the laser projection system with dissipation spot function according to claim 1, is characterized in that, described beam expander is made up of one group of convex lens.
9. the laser projection system with dissipation spot function according to claim 1, is characterized in that, described beam expander is made up of a meniscus and convex lens.
10. the laser projection system with dissipation spot function according to claim 1, is characterized in that, described phase diffusion device is made up of a stochastic space phase-modulator.
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