CN101634752A - Decohering and shimming device - Google Patents
Decohering and shimming device Download PDFInfo
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- CN101634752A CN101634752A CN200810117243A CN200810117243A CN101634752A CN 101634752 A CN101634752 A CN 101634752A CN 200810117243 A CN200810117243 A CN 200810117243A CN 200810117243 A CN200810117243 A CN 200810117243A CN 101634752 A CN101634752 A CN 101634752A
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Abstract
The invention provides a decohering and shimming device, which comprises a diffuse-reflection plate, a total-reflection cavity and a homogenization lens. The decohering and shimming device utilizes a light beam guiding device to guide a light beam to be processed to the diffuse-reflection plate, and the light beam to be processed forms a plurality of beams of scattered light after the diffuse reflection of the diffuse-reflection plate; the plurality of beams of scattered light are totally reflected once or for several times on the sidewall of the total-reflection cavity along respective different propagation paths in the total-reflection cavity; optical path difference between every two beams is randomly modulated and is incoherent so that the light beams emergent from emergent ports of the total-reflection cavity are incoherent light; and then the incoherent light forms the light beams with uniformly distributed illumination in a target area through the homogenization lens. In addition, the decohering and shimming device also can adopt a mechanical means to change an incident point of the light beam to be processed on the diffuse-reflection plate all the time so as to improve the decohering effect.
Description
Technical field
The present invention relates to laser field, be specifically related to eliminating coherence and shimming device in the laser display field.
Background technology
Laser is because its high brightness, monochromaticity, directivity and have incomparable advantage in the demonstration field.The ultimate principle of laser display is: R, G, B three look laser through after shaping, expanding steps such as bundle, shimming, eliminating coherence, are modulated the back through light valve again and are closed look by color-combination prism respectively, and throwing or rear-projection mode project to screen before adopting through projection objective at last.The incoherent light source that is adopted with other display techniques is different, laser has the coherence, if it not being carried out eliminating coherence handles directly as the light source projection, we can see the speckle image of tangible brightness disproportionation on receiving screen, it is so-called speckle, such picture quality influences onlooker impression very much, therefore in laser display technology, and the eliminating coherence step that is absolutely necessary one.
It is that the patent of CN2555523 all adopts the diffuse transmission element of rotation to come modulated laser that publication number is respectively CN1900813 and CN1734308 and grant number, upset its phase place to realize eliminating coherence, then transmitted light is coupled into the optically focused rod and carries out shimming, eliminating coherence is finished by different devices with shimming functions in this method, and, cause the utilization factor of laser low because diffuse transmission element transmitance is limited; In addition, this method is to the installation accuracy of parts have relatively high expectations (when rotating, incident light need impinge perpendicularly on the diffuse transmission element surface all the time); In addition, this method causes also has coupling device between eliminating coherence and the shimming device, make system unit more, is difficult to reduce volume.
Summary of the invention
Therefore, in order to overcome the prior art deficiency, the invention provides a kind of device that can realize eliminating coherence and shimming functions simultaneously.
On the one hand, the invention provides a kind of decohering and shimming device that is used for laser beam, comprise,
Diffuse reflector has diffuse surface, described diffuse surface be used for receiving and the described laser beam of diffuse reflection to obtain the multi beam scattering laser;
The total reflection chamber, be used for the described scattering laser of wall total reflection within it and produce the outgoing beam of directed output, wherein, described total reflection chamber has relative two ends, described diffuse reflector is arranged on an end in described total reflection chamber and covers described end, and its diffuse surface is towards the total reflection chamber;
Homogenization lens, described homogenization lens is arranged in the light path of described outgoing beam, so that described outgoing beam illumination when arriving the target area evenly distributes.
The above-mentioned decohering and shimming device that is used for laser beam wherein also comprises the light beam guiding device, is used for the described laser beam described diffuse reflector that leads.
The above-mentioned decohering and shimming device that is used for laser beam wherein, also comprises the polarization transmission element, and described polarization transmission element only allows that the light beam along certain direction polarization sees through in the outgoing beam of described directed output.
The above-mentioned decohering and shimming device that is used for laser beam wherein, also comprises motor, and described motor is used to drive described diffuse reflector makes the rotation of the incidence point of described laser beam on described diffuse reflector conversion constantly in self plane.
The above-mentioned decohering and shimming device that is used for laser beam wherein, also comprises motor, and described motor is used to drive described light beam guiding device makes the rotation or the vibration of the conversion constantly of the incidence point of described laser beam on described diffuse reflector.
The above-mentioned decohering and shimming device that is used for laser beam, wherein, described homogenization lens is free-form surface lens or relay lens group.
The above-mentioned decohering and shimming device that is used for laser beam, the diffuse surface of wherein said diffuse reflector are coated with the diffuse-reflective material BaSO of high reflectance
4Or CaSO
4, perhaps described diffuse reflector is made by the high reflectance pottery with coarse diffuse surface.
The above-mentioned decohering and shimming device that is used for laser beam, wherein, described light beam guiding device is completely reflecting mirror with holes or local reflex mirror or the glass plate that is coated with special film that only allows the light beam with 45 ° of incidents to see through.
The above-mentioned decohering and shimming device that is used for laser beam, wherein, described total reflection chamber is axially symmetric structure or rotational symmetry structure.
The above-mentioned decohering and shimming device that is used for laser beam, wherein, described total reflection cavity shape is CPC shape or terrace with edge shape or prismatic.
The above-mentioned decohering and shimming device that is used for laser beam, wherein, described total reflection chamber is a hollow cavity, the inwall of described hollow cavity is coated with the film that is all-trans at described laser beam.
The above-mentioned decohering and shimming device that is used for laser beam, wherein, the described total reflection chamber solid that even transmission substance is made of serving as reasons, the both ends of the surface of described solid are coated with the anti-reflection film at described laser beam, and the outer wall polishing also is coated with or is not coated with the film that is all-trans at described laser beam.
On the other hand, the invention provides a kind of laser display system that adopts the above-mentioned decohering and shimming device that is used for laser beam.
The invention has the beneficial effects as follows:
1. can realize eliminating coherence and shimming functions simultaneously;
2. laser utilization factor height;
3. it is little to take volume, and it is microminiaturized to help display system to realize;
4. quiescent operation entirely, noiselessness and power consumption hardly are applicable to portable display system.
Description of drawings
Below, describe embodiments of the invention in conjunction with the accompanying drawings in detail, wherein:
Figure 1A is the synoptic diagram of one embodiment of the present of invention;
Figure 1B is the synoptic diagram of the apparatus of the present invention after improving on the basis of Figure 1A;
Fig. 2 is the synoptic diagram of another kind of embodiment of the present invention;
Fig. 3 is for being used for the device shown in Figure 1A a kind of synoptic diagram of one chip DLP optical projection system;
Fig. 4 is for being used for the device shown in Figure 1A a kind of synoptic diagram of three-chip type DLP optical projection system.
Embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Embodiment 1:
Figure 1A is the synoptic diagram of one embodiment of the present of invention, and the device in the present embodiment comprises catoptron 102 with holes, diffuse reflector 103 and drives motor 104, total reflection chamber 105 and the free-form surface lens 106 that diffuse reflector 103 rotates.
Structure to the apparatus of the present invention in the present embodiment is described in detail below.Present embodiment adopts catoptron 102 with holes (having disclosed the catoptron with holes of this structure in application number is the utility model patent of CN200720305226.8) to guide the incident laser light beam 101 with coherence to enter total reflection chamber 105, in order to reduce the influence of 102 pairs of light paths of catoptron with holes as far as possible, the size of aperture should be as far as possible little on the catoptron 102 with holes, can be only bigger than the beam diameter of light beam 101.Cavity (the side of having only terrace with edge of truncated rectangular pyramids (being designed to truncated rectangular pyramids is because its bottom shape and DMD light valve 108 form fit) shape is adopted in total reflection chamber 105 in the present embodiment, the last bottom surface that does not have terrace with edge), its inwall is coated with the film to the wavelength total reflection of light beam 101.Diffuse reflector 103 is for covering the circular dull and stereotyped of total reflection chamber 105 upper bottom surfaces fully, it is driven around rotating in the plane at diffuse reflector 103 places by diffuse reflector 103 centers and perpendicular to the axle of diffuse reflector 103 by motor 104, diffuse reflector 103 should try one's best abreast near but the upper bottom surface of not being close to total reflection chamber 105 place, the light beam few so that try one's best spills from the slit between the two, should leave suitable space between the two to guarantee diffuse reflector 103 not friction when rotating and between the total reflection chamber 105, the side to light of diffuse reflector 103 is coated with BaSO equably
4Or CaSO
4Powder body material, the side to light after the coating should be lambert's diffuse surface, and above-mentioned two kinds of powder body materials have high reflectance at visible light wave range.The incidence surface of free-form surface lens 106 and exit surface all should be coated with the anti-reflection film at the wavelength of light beam 101.The outgoing end face (being the bottom surface of truncated rectangular pyramids) in total reflection chamber 105 should be close to and be covered fully to free-form surface lens 106, spills between the two slit to prevent light beam.The effect of free-form surface lens 106 is energy distribution of readjusting from the light beam of total reflection chamber 105 outgoing end faces, and its design will make the illuminance that finally drops on the light beam 107 on the DMD light valve 108 evenly distribute.When the series of parameters such as size, material and surface configuration of design free-form surface lens 106, should consider all influences that may exist in the light path of aperture on the catoptron 102 with holes and present embodiment to the illuminance of DMD light valve 108, design effort can be finished by Zemax 2005 or LightTools 6.0 or Tracepro 3.0 or other similar optical design software, and those skilled in the art are being familiar with can being competent at this design effort after the above-mentioned software using method.
Below the principle of work of realization eliminating coherence of the apparatus of the present invention in the present embodiment and shimming functions is made detailed description.Light beam 101 is for having coherence's laser, it is by the aperture of catoptron 102 with holes, pass free-form surface lens 106 and enter total reflection chamber 105, and be radiated on the diffuse reflector 103, the residing position of rotating shaft when the optimum seeking site of irradiation departs from diffuse reflector 103 rotations.Has high reflectance owing to diffuse reflector 103 rough surface and to light beam 101, the almost diffuse reflection of noenergy loss takes place in light beam 101 on diffuse reflector 103 surfaces, the multi beam scattered light that is divided into is to space all directions scattering, these scattered lights are 105 inner generation one or many (being generally repeatedly) total reflections in the total reflection chamber, through after the different separately propagated from the outgoing end face outgoing in total reflection chamber 105, each scattered light this moment optical path difference to each other is by Stochastic Modulation, and the light beam coherence of 105 outgoing ends, total reflection chamber greatly weakens; Because diffuse reflector 103 not stall under motor 104 drives is moving, make each constantly carry out diffuse reflection to incident beam 101 by positions different on the diffuse reflector 103 (the coarse situation differences on these surfaces, position), the scattered light that obtains is all changing constantly in spatial distributions, thus the coherence who has further weakened laser.The optically focused rod shimming principle of knowing based on the demonstration field, repeatedly reflection through the 105 pairs of scattered lights in total reflection chamber, the illuminance of its outgoing end is evenly distributed, the aperture that passes catoptron 102 with holes through the light beam sub-fraction of free-form surface lens 106 back outgoing loses, and most light beams enter subsequent optical path after being reflected by catoptron 102 with holes.Energy through 106 pairs of light fields of free-form surface lens distributes again, can obtain the equally distributed noncoherent light beam 107 of illuminance at DMD light valve 108 places.So far, apparatus of the present invention have realized eliminating coherence and the shimming functions to laser beam 101.Because the depolarization that the scattering process of diffuse reflector 103 causes, the light beam of 105 outgoing ends, total reflection chamber is a partial poolarized light, thereby light beam 107 also is a partial poolarized light, it is used to shine the DMD light valve is complete acceptable, but can not be directly used in polarizability optical modulation elements such as illumination LCD light valve or LCOS light valve.
Figure 1B is the synoptic diagram of the apparatus of the present invention after improving on the basis of Figure 1A.The light beam that adopts the device among Figure 1B the to produce polarizability optical modulation elements such as LCD light valve or LCOS light valve that can be used for throwing light on.Different with Figure 1A is, Figure 1B is provided with a polarization transmission element 109 between free-form surface lens 106 and total reflection chamber 105, polarization transmission element 109 should be bigger than the size of the outgoing end face in total reflection chamber 105, and the outgoing end face of being close to total reflection chamber 105 places, and 106 of free-form surface lens are close to polarization transmission element 109.Polarization transmission element 109 can be the light-passing board that has been coated with special film, this light-passing board that has been coated with special film only allows incident beam 101 and from 105 outgoing of total reflection chamber and light transmissions incident beam 101 identical polarization directions, and will participate in scattering and shimming process again in the light reflected back total reflection chamber 105 of other polarization directions of total reflection chamber 105 outgoing.Use polarization transmission element 109 can obtain incoherent, linear polarization and the uniform light beam 110 of Illumination Distribution at LCD light valve 111 places.Upper bottom surface edge in total reflection chamber 105 can also be provided with baffle plate 112, and the light that spills from the slit in diffuse reflector 103 and total reflection chamber 105 is collected by baffle plate 112 and reflected back total reflection chamber 105 utilizes again, has reduced the loss to light beam.
The rotating shaft of diffuse reflector 103 is preferably placed at the center, but also can be not in the center, diffuse reflector 103 is preferably circular dull and stereotyped, but also can be the flat board of Any shape, as long as diffuse reflector 103 all can cover the upper bottom surface in total reflection chamber 105 fully in the process of rotating a week.Alternatively, free-form surface lens 106 also can be placed apart with total reflection chamber 105 with leaving the slit.Polarization transmission element 109 can also be the element of output polarization light such as common polaroid in this area and PBS prism, can be placed on the appropriate location of other before the light valve in the light path according to actual conditions.
Generally, because the BaSO that the side to light of diffuse reflector 103 applies
4Or CaSO
4The powder body material reflectivity is very high, can reach more than 98% at visible light wave range, and the inwall in total reflection chamber 105 can reach more than 99% to the scattered light reflectivity of incident beam 101, and the anti-reflection film transmissivity at incident beam 101 that free-form surface lens 106 surfaces are coated with can reach more than 99%, ignore the light beam of missing from the slit between diffuse reflector 103 and the total reflection chamber 105 on a small quantity, whole contrive equipment is almost lossless to laser, the utilization factor of luminous energy is high, and this is very important advantage to laser display.
Embodiment 2:
Fig. 2 is the synoptic diagram of another kind of embodiment of the present invention.Present embodiment adopts local reflex mirror 202 to guide the incident laser light beam 201 with coherence to enter total reflection chamber 205, local reflex mirror 202 reflection positions are coated with the high-reflecting film at the wavelength of light beam 201,202 transmissions of local reflex mirror partly are coated with the anti-reflection film at the wavelength of light beam 201, the local reflex mirror 202 that uses this new structure is because its size can accomplish to accept fully light beams all in the light path, thereby the stationary installation of local reflex mirror 202 needn't appear in the light path, and light path is not disturbed.The normal of light beam 201 on local reflex mirror 202 is the L axle, the M axle by light beam 201 on local reflex mirror 202 incidence point and depart from L axle certain angle slightly, and motor 204 drives local reflex mirrors 202 and rotates around the M axle.When local catoptron 202 rotates, light beam 201 changes among a small circle at one in the incident angle on the local reflex mirror 202, thereby change light beam 201 drop point on diffuse reflector 203 after 202 reflections of local reflex mirror, with the space distribution of the follow-up scattered light of time changing, strengthen the effect of eliminating coherence.Diffuse reflector 203 is a rectangle, because local reflex mirror 202 is rotating, diffuse reflector 203 just can be arranged to be close to 205 settings of total reflection chamber and remain static, and the benefit of doing like this is not have light beam to spill between diffuse reflector 203 and total reflection chamber 205.Total reflection chamber 205 is adopted and is called compound parabolic concentrator (CPC, Compound Parabolic Concentrator, a kind of axisymmetric body) cavity, bottom surface is rectangle (bottom surface shape and DMD light valve 208 form fit) on it, its inwall is coated with the total reflection film at the wavelength of light beam 201, use the cavity of this shape can obtain the very little nearly parallel beam of the angle of divergence to the light beam shimming, the optical extend that this means the light beam behind the shimming is very little, and this performance is very favourable in Projection Display.From the light beam of total reflection chamber 205 outgoing is the uniform light beam of incoherent illumination, behind its process local reflex mirror 202, form the light beam 206 of similar annular eclipse shape, though dash area only accounts for a very little part, but can not be with light beam 206 direct illumination DMD light valves 208, must use the light beam imaging of 207 pairs of total reflection chambeies of a relay lens group, 205 outgoing end faces, image planes are dropped on the DMD light valve 208, obtain the uniform light beam of illumination at light valve 208 places.
The effect of catoptron 102 with holes is identical in essence among the effect of local reflex mirror 202 and the embodiment 1, can be referred to as the light beam guiding device here.The light beam guiding device also can adopt the glass plate that is coated with special film, and this special film only allows with the light transmission of 45 ° of incidents on it, with the light of other angle incidents total reflection takes place then.Therefore can be with these 45 ° of placements of the relative incident laser of glass plate that are coated with special film with laser aiming to diffuse reflector.The form of light beam guiding device can be varied, so long as incident laser can be guided to diffuse reflector, can not cause the sex implementation of structure all can to whole optical path simultaneously.
Adopt in the present embodiment and rotate the incoming position of local reflex mirror 202 change incident beams 201 on diffuse reflector 203, make diffuse reflector 203 to rotate, can be close to total reflection chamber 205 places, so just can not leave the space allows light beam spill, the rotation of certain above-mentioned local reflex mirror 202 also can be vibrated instead and realize allowing the diffuse reflector different parts come the purpose of scatter incident light, but the life-span of vibrating motor does not have the rotary electric machine life-span long in general.Certainly, allow light beam spill, also diffuse reflector 203 can be close to total reflection chamber 205, the two is together rotated, but this method is neither easy, again rotation precision is had relatively high expectations simultaneously, therefore seldom use in order not leave the space.
The setting of relay lens group 207 belongs to the known technology of field of projection display, and those of ordinary skills can be competent at this work.Of particular note, using relay lens group 207 is because its cost is lower than free-form surface lens, easily obtain, and can adjust according to the concrete condition of light path, customization forms and free-form surface lens is according to environment for use, versatility is relatively poor, therefore for example tests or low-cost occasion in some occasion, and relay lens group can be used as good the substituting of free-form surface lens.And because free-form surface lens is similar with the relay lens group role, all be used for the further homogenize of outgoing beam is obtained the uniform light beam of illumination to locate (for example light valve) in the target area, can be referred to as homogenization lens here.
It will be understood by those skilled in the art that device in the present embodiment after adding the polarization transmission element, polarizability optical modulation elements such as LCD light valve or LCOS light valve can be used for throwing light on.
Embodiment 3:
Fig. 3 is for being used for the device shown in Figure 1A a kind of synoptic diagram of one chip DLP optical projection system.In the present embodiment, the tricolor laser light source is made up of red laser 301, green (light) laser 302 and blue laser 303, and launches ruddiness 321, green glow 322, the blue light 323 with coherence respectively.Ruddiness 321, green glow 322, blue light 323 time-sharing multiplexs pass the hole of catoptron 305 with holes after, incide on the diffuse reflector 306 via free-form surface lens 309, diffuse reflector 306 is driven by motor 307 and rotates.The inwall in total reflection chamber 308 is coated with the film to ruddiness 321, green glow 322, blue light 323 total reflections, tricolor laser incides on TIR (the total internal reflection) prism 311 through forming incoherent light after the processing of diffuse reflector 306, total reflection chamber 308 and free-form surface lens 309 respectively, by DMD light valve 310 it is modulated then, the image that the modulation back produces is projected onto on the screen 313 via the amplification of projecting lens 312.Herein, the design of free-form surface lens 309 need be considered the hole of catoptron 305 with holes and the influence of 311 pairs of light paths of TIR prism, makes that the light beam light Illumination Distribution that drops on the DMD light valve 310 is even.
Therefore present embodiment can use monolithic DMD light valve time-sharing multiplex ground that the three primary colours optical modulation is realized the full color projection owing to adopted time-sharing multiplexing technology.Alternatively, needn't make tricolor laser, but allow laser of all kinds pass through respectively in that 3 holes are set on catoptron 305 with holes from same aperture incident.
Alternatively, can also remove motor 307, diffuse reflector 306 is close to total reflection chamber 308 be provided with, though the eliminating coherence effect can obtain being slightly poorer than motor 307 like this time with its relative fixed ground, but still in the human eye tolerance interval, and remove motor 307 and can effectively reduce energy consumption; In addition, current experiments shows, if do not have motor 307, diffuse reflector 306, total reflection chamber 308 and free-form surface lens 309 threes' cumulative volume can accomplish in 30mm * 10mm * 10mm, so do not adopt the device of motor 307 to be suitable for miniature or the portable laser optical projection system.
Those of ordinary skills should be understood that the apparatus of the present invention shown in Figure 1B can be used for one chip LCD optical projection system or one chip LCOS optical projection system.
Embodiment 4:
Fig. 4 is for being used for the device among Figure 1A a kind of synoptic diagram of three-chip type DLP optical projection system.LASER Light Source is made up of red laser 401, green (light) laser 402 and blue laser 403, and it is red-emitting, green glow and blue light respectively.Present embodiment has adopted the device shown in three cover Figure 1A respectively ruddiness, green glow and blue light to be carried out eliminating coherence and shimming is handled.Here be that example describes with green glow 404 only, the course of work of ruddiness and blue light and green glow 404 are basic identical.Green glow 404 passes the aperture of catoptron 405 with holes and passes free-form surface lens 406 and incides on the diffuse reflector 408, diffuse reflector 408 is driven by motor 409 and rotates, the multi beam scattered light that is divided into comes back reflective after free-form surface lens 406 outgoing at total reflection chamber 407 inwalls (total reflection chamber 407 inwalls are coated with the film to green glow 404 total reflections), outgoing beam incides TIR (total internal reflection) prism 410 after the reflection of catoptron 405 with holes, on green glow DMD light valve 411, form the equally distributed light beam of noncoherent illuminance, the laser that light beam after 411 modulation of green glow DMD light valve enters X-cube color-combination prism 412 and other two kinds of colors closes look, wherein three look laser light valve separately is designed to equate to the light path of X-cube color-combination prism 412, and the coloured light that closes from 412 outgoing of X-cube color-combination prism projects to screen 414 by projection lens set 413 at last.
Total reflection chamber in apparatus of the present invention can be axisymmetric body or rotationally symmetric body, its outgoing end surface shape should with the light valve form fit (being that Aspect Ratio is consistent) in the subsequent optical path.In the present embodiment, using the total reflection chamber of terrace with edge shape, is the consideration for the compression outgoing beam angle of divergence, and in fact, because free-form surface lens has the effect of reformation light field, prism shape also can be adopted in the total reflection chamber.In addition, the total reflection chamber also can be the solid of being made by even transmission substance (for example glass and transparent plastic), the outer wall of solid must polish, outer wall can plate at the total reflection film of incident beam wave band or plated film is (unsuitable as if material refractive index and shape, total reflection can take place in side wall interface in light beam), the both ends of the surface of solid should be coated with the anti-reflection film at the incident beam wave band.
It should be noted last that above embodiment is only unrestricted in order to technical scheme of the present invention to be described.Although the present invention is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is made amendment or is equal to replacement, do not break away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (13)
1. a decohering and shimming device that is used for laser beam comprises,
Diffuse reflector has diffuse surface, described diffuse surface be used for receiving and the described laser beam of diffuse reflection to obtain the multi beam scattering laser;
The total reflection chamber, be used for the described scattering laser of wall total reflection within it and produce the outgoing beam of directed output, wherein, described total reflection chamber has relative two ends, described diffuse reflector is arranged on an end in described total reflection chamber and covers described end, and its diffuse surface is towards the total reflection chamber;
Homogenization lens, described homogenization lens is arranged in the light path of described outgoing beam, so that described outgoing beam illumination when arriving the target area evenly distributes.
2. the decohering and shimming device that is used for laser beam as claimed in claim 1 wherein also comprises the light beam guiding device, is used for the described laser beam described diffuse reflector that leads.
3. the decohering and shimming device that is used for laser beam as claimed in claim 1 or 2 wherein, also comprises the polarization transmission element, and described polarization transmission element only allows that the light beam along certain direction polarization sees through in the outgoing beam of described directed output.
4. as the described decohering and shimming device that is used for laser beam of one of claim 1-3, wherein, also comprise motor, described motor is used to drive described diffuse reflector makes the rotation of the incidence point of described laser beam on described diffuse reflector conversion constantly in self plane.
5. as the described decohering and shimming device that is used for laser beam of one of claim 1-3, wherein, also comprise motor, described motor is used to drive described light beam guiding device makes the rotation or the vibration of the conversion constantly of the incidence point of described laser beam on described diffuse reflector.
6. as the described decohering and shimming device that is used for laser beam of one of claim 1-5, wherein, described homogenization lens is free-form surface lens or relay lens group.
7. as the described decohering and shimming device that is used for laser beam of one of claim 1-6, the diffuse surface of wherein said diffuse reflector is coated with the diffuse-reflective material BaSO of high reflectance
4Or CaSO
4, perhaps described diffuse reflector is made by the high reflectance pottery with coarse diffuse surface.
8. as the described decohering and shimming device that is used for laser beam of one of claim 2-7, wherein, described light beam guiding device is completely reflecting mirror with holes or local reflex mirror or the glass plate that is coated with special film that only allows the light beam with 45 ° of incidents to see through.
9. as the described decohering and shimming device that is used for laser beam of one of claim 1-8, wherein, described total reflection chamber is axially symmetric structure or rotational symmetry structure.
10. the decohering and shimming device that is used for laser beam as claimed in claim 9, wherein, described total reflection cavity shape is CPC shape or terrace with edge shape or prismatic.
11. as the described decohering and shimming device that is used for laser beam of one of claim 1-10, wherein, described total reflection chamber is a hollow cavity, the inwall of described hollow cavity is coated with the film that is all-trans at described laser beam.
12. as the described decohering and shimming device that is used for laser beam of one of claim 1-10, wherein, the described total reflection chamber solid that even transmission substance is made of serving as reasons, the both ends of the surface of described solid are coated with the anti-reflection film at described laser beam, and outer wall polishes and be coated with or be not coated with the film that is all-trans at described laser beam.
13. one kind is adopted the described laser display system that is used for the decohering and shimming device of laser beam of one of claim 1-12.
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| CN200810117243A CN101634752A (en) | 2008-07-25 | 2008-07-25 | Decohering and shimming device |
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| CN102313999A (en) * | 2010-07-07 | 2012-01-11 | 北京中视中科光电技术有限公司 | Device for weakening laser speckle |
| CN102053372A (en) * | 2011-01-27 | 2011-05-11 | 清华大学 | Improved development process for light beam homogenization device |
| CN102053383A (en) * | 2011-01-29 | 2011-05-11 | 中北大学 | Speckle eliminating device based on Mie scatter and perturbation drive |
| WO2012100645A1 (en) * | 2011-01-29 | 2012-08-02 | 中北大学 | Speckle removal device based on mie scattering and perturbation drive |
| CN102053383B (en) * | 2011-01-29 | 2012-09-26 | 中北大学 | Speckle eliminating device based on Mie scatter and perturbation drive |
| 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 |
| CN104570305B (en) * | 2013-10-24 | 2017-11-14 | 清华大学 | Free-form surface lens and the imaging system containing the free-form surface lens |
| CN104570305A (en) * | 2013-10-24 | 2015-04-29 | 清华大学 | Free-form surface lens and imaging system containing same |
| CN103901595B (en) * | 2014-03-13 | 2017-12-12 | 石晶 | A kind of light collection device |
| CN103901595A (en) * | 2014-03-13 | 2014-07-02 | 石晶 | Light ray gathering device |
| CN103941357A (en) * | 2014-04-25 | 2014-07-23 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN104460206A (en) * | 2014-11-29 | 2015-03-25 | 杨毅 | Light emitting device and projection device |
| WO2018103341A1 (en) * | 2016-12-09 | 2018-06-14 | 深圳开立生物医疗科技股份有限公司 | Light coupled device, light source system, and endoscope system |
| CN109223176A (en) * | 2018-10-26 | 2019-01-18 | 中南大学湘雅三医院 | A kind of surgical planning system |
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Application publication date: 20100127 |