CN105182674A - Laser light source special for laser projector - Google Patents
Laser light source special for laser projector Download PDFInfo
- Publication number
- CN105182674A CN105182674A CN201510711125.XA CN201510711125A CN105182674A CN 105182674 A CN105182674 A CN 105182674A CN 201510711125 A CN201510711125 A CN 201510711125A CN 105182674 A CN105182674 A CN 105182674A
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- Prior art keywords
- laser
- beam splitter
- light source
- polarizing beam
- polarized light
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000010287 polarization Effects 0.000 claims abstract description 20
- 230000011514 reflex Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000009826 distribution Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 241001062009 Indigofera Species 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000739 chaotic effect Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
-
- 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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2066—Reflectors in illumination beam
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2073—Polarisers in the lamp house
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Projection Apparatus (AREA)
Abstract
The invention discloses a laser light source special for a laser projector. The laser light source comprises a laser emitting part (1-3) and a feedback interference system, wherein the feedback interference system comprises a phase modulator (5), a polarizing beam splitter (6) and a reflecting mirror (7) which are arranged along the light path in turn; the laser beam emitted from the laser emitting part (1-3) is a linearly polarized light which enters into the phase modulator (5); the phase difference is generated for the phases of a P polarized light component and an S polarized light component in the laser beam by the phase modulator (5), so that the polarization state of the laser beam is changed; the laser beam outputted from the phase modulator (5) enters into the polarizing beam splitter (6); the P polarized light component of the laser beam is transmitted to the reflecting mirror (7) by the polarizing beam splitter (6) and is reflected to the polarizing beam splitter (6) by the reflecting mirror (7); after the P polarized light component is transmitted, the P polarized light component returns to the laser emitting part (1-3) through the phase modulator (5); the S polarized light component of the laser beam is reflected by the polarizing beam splitter (6).
Description
Technical field
The application relates to a kind of LASER Light Source, particularly relates to the special LASER Light Source of a kind of laser projection.
Background technology
Three look laser are high with its power, and the long-life, color rendition degree is high, is more and more subject to people's attention, and becomes the preferred light source of Projection Display of future generation.What current laser projection was applied is RGB laser semiconductor (LD) array, enters projecting cell composition laser projection system by optical fiber or coupled lens system.Semiconductor laser due to its coherence fine, projected picture has very strong speckle phenomena, can not directly using it as projection light source.The measure taked now utilizes the element such as phase plate or diffusion sheet to upset its polarization state and phase place, reduces its coherence, and these measures can only play the effect reducing speckle particle degree and thickness, fundamentally can not eliminate speckle.We are used in engineering project all right by the laser projection produced with upper type, but will to enter civilian (people need for a long time, repeatedly watch) be not all right.
Summary of the invention
The problems referred to above that present invention is directed to prior art are developed.
According to embodiments of the invention, propose the special LASER Light Source of a kind of laser projection, it is characterized in that comprising laser emission part (1-3), by the phase-modulator arranged successively along light path (5), the feedback interference system that polarizing beam splitter (6) and reflection part (7) form, and Laser output part, wherein, the laser beam that laser emission part (1-3) sends is linearly polarized light, it enters phase-modulator (5), phase-modulator (5) makes the P polarized light component in laser beam produce phasic difference mutually with the position of S polarized light component, thus change the polarization state of laser beam, wherein, the laser beam exported from phase-modulator (5) enters polarizing beam splitter (6), polarizing beam splitter (6) is transmitted to reflection part (7) for making the P polarized light component of this laser beam, and reflect back into polarizing beam splitter (6) by reflection part (7), through getting back to laser emission part (1-3) by phase-modulator (5) after transmission, and, polarizing beam splitter (6) reflexes to Laser output part for making the S polarized light component of this laser beam.
Beneficial effect of the present invention is as follows: provide the special LASER Light Source of laser projection, utilizes semiconductor laser to inject feedback signal thus produces chaotic laser light form, the coherent length of laser being reduced, thus effectively suppress laser speckle.
Accompanying drawing explanation
Fig. 1 is the structural representation that the special LASER Light Source of laser projection according to an embodiment of the invention is shown;
Fig. 2 is the structural representation of the special LASER Light Source of laser projection illustrated according to another embodiment of the invention.
Embodiment
Be further described in detail technical scheme of the present invention below in conjunction with the drawings and specific embodiments, thus, advantage and disadvantage of the present invention will be more clear along with description.
Although those skilled in the art will appreciate that the following description relates to a lot of ins and outs of embodiment for the present invention, this is only the example for principle of the present invention is described and does not mean that any restriction.The present invention can be applicable to be different from the occasion outside the following ins and outs exemplified, as long as they do not deviate from principle of the present invention and spirit.
In addition, miscellaneous in order to avoid making the description of this instructions be limited to, in description in this manual, the process such as omission, simplification, accommodation may have been carried out to the portion of techniques details that can obtain in prior art data, this is understandable for a person skilled in the art, and this can not affect the open adequacy of this instructions.
Fig. 1 is the structural representation that the special LASER Light Source of laser projection according to an embodiment of the invention is shown.
As shown in Figure 1, the special LASER Light Source of laser projection according to an embodiment of the invention mainly comprises blue light LD (laser diode) array 1, ruddiness LD array 2, green glow LD array 3, collimation lens 4, phase-modulator 5, polarizing beam splitter 6, catoptron 7, color-combination prism (closing look parts) 8, collector lens group 9.Wherein, each LD unit that is blue, red, green glow LD array 1 to 3 is corresponding respective respectively one group of collimation lens 4, phase-modulator 5, polarizing beam splitter 6 and catoptron 7.
Wherein, the laser that blue, red, green glow LD array 1 to 3 sends is collimated respectively via respective collimation lens 4, enters the feedback interference system be made up of phase-modulator 5, polarizing beam splitter 6 and catoptron 7 afterwards respectively.
The direction of phase-modulator 5 is adjusted so that the feedback light reflected from catoptron 7 is to indigo plant, red, the laser that green glow LD array 1 to 3 sends forms interference, and make each LD be in chaos state, at this moment blue, red, the interference length of the laser that green glow LD array 1 to 3 sends separately can become hundreds of micron from several meters, laser is in this state after the convergence of color-combination prism 8 and collector lens group 9 (composition Laser output part), enter projecting cell 10, phase plate again in projecting cell 10, diffusion sheet (not shown) etc. carries out disturbance, just can eliminate due to the speckle on the projection screen caused capable and experienced related to sex of laser.Wherein, different feedback power ratios is needed because different laser instruments (such as having different Resonant Intake System) reaches chaos state, need the main shaft of control phase modulator 5 relative to the angle of the polarization direction of laser, in general, when angle between the two regulates between from 0 degree to 45 degree, an angle is inherently found to make laser instrument reach chaos state.
Particularly, blue, red, the output beam of the LD that green glow LD array 1 to 3 is respective is the linearly polarized laser light beam of high polarizability, through collimation lens 4 (such as, collimation non-spherical lens) export as parallel beam (polarization ratio can reach 120:1) afterwards, parallel beam is through phase-modulator (such as half-wave plate) 5, wherein the position of the P polarized light of parallel polarization light beam and S polarized light component mutually between, produce optical path difference or 180 ° of phasic differences of 1/2nd wavelength, its polarization state changes, wherein, the change of polarization state depends primarily on the major axes orientation of phase-modulator 5 and the angle of the polarization direction of parallel light beam.Laser beam passes through polarizing beam splitter 6 after phase-modulator 5, wherein, polarizing beam splitter (such as, polarization splitting prism) 6 the laser beam of incidence can be divided into the vertical linearly polarized light of two bundles, wherein P polarized light passes through completely, and S polarized light is reflected to color-combination prism 8 with miter angle, exit direction becomes an angle of 90 degrees with P light.P polarized light impinges perpendicularly on catoptron 7 by after polarizing beam splitter 6, according to light path principle of reversibility, returns each LD along original optical path.
Such as, polarizing beam splitter 6 is formed by a pair high precision right-angle prism gummed, the hypotenuse of one of them prism is coated with polarization spectro deielectric-coating, the S polarized light of reflection is after color-combination prism 8, the laser beam of three colors is combined into a branch of, is exported afterwards by collector lens group 9 (shaping device).
Wherein, the diameter of half-wave plate 5 can be 5-8mm, and the size of polarization splitting prism can be 5mm*5mm*5mm or 8mm*8mm*8mm.
The following describes the generation principle of chaos state laser.
By the major axes orientation of control phase modulator 5 (half-wave plate), the allocation proportion of the component of the laser after by half-wave plate on two polarization directions (P polarization and S polarization) can be changed.Like this, when different cavity is long, (this chamber length is that the chamber of laserresonator is long, the laser instrument that different cavity is long, need the ratio of feedback light different, just can reach chaos state), when the P polarized light component feeding back to each LD as mentioned above reaches corresponding proportion relative to the light that each LD sends, now the humorous polarization state of LD can be subject to the interference of feedback light, be no longer a stable state, but enter chaos state, under chaos state, the relevant wavelength of laser will significantly reduce.In actual debug process, while the optical axis of adjustment half-wave plate, by the output frequency of oscillograph Real-Time Monitoring Laser Output Beam, just stop the adjustment of half-wave plate once form chaos state.Particularly, under lower state, laser frequency is periodic distribution, and intensity distributions is stable.After entering chaos state, laser frequency no longer has periodic distribution, observes from oscillographic frequency spectrum the waveform being similar to noise.
Catoptron 7 can be the reflecting optics be separated, and also can be the high reverse--bias plated film rete on polarization splitting prism.
The weak interference light that chaos state LD sends reflexes to color-combination prism 8 through polarizing beam splitter 6, then enters projecting cell 10 through collector lens group 9, is formed without speckle projection image.
Fig. 2 is the structural representation of the special LASER Light Source of laser projection illustrated according to another embodiment of the invention.
Compared with the embodiment shown in Fig. 1, this embodiment two panels dichroic mirror replaces color-combination prism 8 to carry out conjunction light, and wherein, the first dichroic mirror 11 pairs bluish-green laser carries out conjunction look, and the bluish-green laser after the involutory look of the second dichroic mirror 12 and red laser carry out conjunction look.
Two panels dichroic mirror also can have other modes of emplacement, as long as it is just passable to close light.
Finally it should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed among right of the present invention.
Claims (9)
1. the special LASER Light Source of laser projection, it is characterized in that comprising laser emission part (1-3), the feedback interference system be made up of the phase-modulator arranged successively along light path (5), polarizing beam splitter (6) and reflection part (7) and Laser output part
Wherein, the laser beam that laser emission part (1-3) sends is linearly polarized light, it enters phase-modulator (5), phase-modulator (5) makes the P polarized light component in laser beam produce phasic difference mutually with the position of S polarized light component, thus change the polarization state of laser beam
Wherein, the laser beam exported from phase-modulator (5) enters polarizing beam splitter (6), polarizing beam splitter (6) is transmitted to reflection part (7) for making the P polarized light component of this laser beam, and reflect back into polarizing beam splitter (6) by reflection part (7), through getting back to laser emission part (1-3) by phase-modulator (5) after transmission, further, polarizing beam splitter (6) reflexes to described Laser output part for making the S polarized light component of this laser beam.
2. the special LASER Light Source of laser projection according to claim 1, characterized by further comprising the collimation lens (4) be positioned between laser emission part (1-3) and phase-modulator (5), is parallel beam for multiple laser beam collimations that will send from laser emission part (1-3).
3. the special LASER Light Source of laser projection according to claim 2, it is characterized in that, described laser emission part (1-3) comprises blue laser diode array (1), red laser diode array (2) and green laser diode array (3)
Each in described blue laser diode array (1), red laser diode array (2) and green laser diode array (3) corresponds to one group of collimation lens (4) and described feedback interference system
Described Laser output part comprises closes look parts (8) and collector lens group (9), wherein, described polarizing beam splitter (6) reflexes to described conjunction look parts (8) for making the S polarized light component of this laser beam, described conjunction look parts (8) are for carrying out conjunction look to the red, green, blue look laser exported from each polarizing beam splitter (6), and output to described collector lens group (9)
Described collector lens group (9) is assembled for the laser that will export from described conjunction look parts (8), and outputs to projecting cell (10).
4. the special LASER Light Source of laser projection according to claim 1, is characterized in that, described polarizing beam splitter (6) is formed by a pair high precision right-angle prism gummed, the hypotenuse of one of them prism is coated with polarization spectro deielectric-coating.
5. the special LASER Light Source of laser projection according to claim 1, it is characterized in that, described phase-modulator (5) is half-wave plate, its major axes orientation is adjustable, diameter is 5 to 8mm, described polarizing beam splitter (6) is polarization splitting prism, and it is of a size of 5mm*5mm*5mm or 8mm*8mm*8mm.
6. the special LASER Light Source of laser projection according to claim 1, is characterized in that, described reflection part (7) is catoptron.
7. the special LASER Light Source of laser projection according to claim 4, is characterized in that, described reflection part (7) is formed by the high reverse--bias plated film rete of the rear surface of described polarizing beam splitter (6).
8. the special LASER Light Source of laser projection according to claim 4, is characterized in that, described conjunction look parts (8) are color-combination prisms.
9. the special LASER Light Source of laser projection according to claim 4, is characterized in that, described conjunction look parts (8) are made up of two panels dichroic mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510711125.XA CN105182674B (en) | 2015-10-28 | 2015-10-28 | The special LASER Light Source of laser projection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510711125.XA CN105182674B (en) | 2015-10-28 | 2015-10-28 | The special LASER Light Source of laser projection |
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| Publication Number | Publication Date |
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| CN105182674A true CN105182674A (en) | 2015-12-23 |
| CN105182674B CN105182674B (en) | 2017-06-23 |
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| CN201510711125.XA Expired - Fee Related CN105182674B (en) | 2015-10-28 | 2015-10-28 | The special LASER Light Source of laser projection |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441144A (en) * | 2016-06-24 | 2017-02-22 | 天津大学 | Three-dimensional morphology measurement method for inhibiting speckles on the basis of wide-spectrum laser |
| CN106444068A (en) * | 2016-06-24 | 2017-02-22 | 天津大学 | Laser speckle inhibition method |
| CN108803221A (en) * | 2018-06-25 | 2018-11-13 | 太原理工大学 | Laser projection laser light source |
| CN109782517A (en) * | 2019-01-25 | 2019-05-21 | 太原理工大学 | Method and device for generating low-coherence light by broadband chaotic modulation in laser display |
| CN110928123A (en) * | 2018-09-19 | 2020-03-27 | 青岛海信激光显示股份有限公司 | Laser array, laser light source and laser projection equipment |
| US11467477B2 (en) | 2018-09-19 | 2022-10-11 | Hisense Laser Display Co., Ltd. | Laser array, laser source and laser projection device |
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| WO2008152781A1 (en) * | 2007-06-12 | 2008-12-18 | Panasonic Corporation | Projection type image display device |
| CN101493582A (en) * | 2009-02-23 | 2009-07-29 | 福州高意通讯有限公司 | Optical structure for eliminating laser speckle |
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2015
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Patent Citations (9)
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| JP2001314991A (en) * | 2000-05-09 | 2001-11-13 | Sumitomo Heavy Ind Ltd | Laser beam processing method and mask optical system used therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441144A (en) * | 2016-06-24 | 2017-02-22 | 天津大学 | Three-dimensional morphology measurement method for inhibiting speckles on the basis of wide-spectrum laser |
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| US11467477B2 (en) | 2018-09-19 | 2022-10-11 | Hisense Laser Display Co., Ltd. | Laser array, laser source and laser projection device |
| CN109782517A (en) * | 2019-01-25 | 2019-05-21 | 太原理工大学 | Method and device for generating low-coherence light by broadband chaotic modulation in laser display |
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| Publication number | Publication date |
|---|---|
| CN105182674B (en) | 2017-06-23 |
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