CN105182674B - The special LASER Light Source of laser projection - Google Patents
The special LASER Light Source of laser projection Download PDFInfo
- Publication number
- CN105182674B CN105182674B CN201510711125.XA CN201510711125A CN105182674B CN 105182674 B CN105182674 B CN 105182674B CN 201510711125 A CN201510711125 A CN 201510711125A CN 105182674 B CN105182674 B CN 105182674B
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- laser
- modulator
- phase
- beam splitter
- polarizing beam
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- 230000010287 polarization Effects 0.000 claims abstract description 28
- 230000005540 biological transmission Effects 0.000 claims abstract description 3
- 230000011514 reflex Effects 0.000 claims description 4
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 claims 3
- 238000003491 array Methods 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000739 chaotic effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 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
- 230000000737 periodic effect Effects 0.000 description 1
- 238000009738 saturating Methods 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Projection Apparatus (AREA)
Abstract
This application discloses a kind of special LASER Light Source of laser projection,It includes laser emission part (1 3),By the phase-modulator (5) being sequentially arranged along light path,The feedback interference system of polarizing beam splitter (6) and speculum (7) composition,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 polarization light component in laser beam mutually produce position to differ with the position of S-polarization light component,So as to change the polarization state of laser beam,Wherein,Enter polarizing beam splitter (6) from the laser beam of phase-modulator (5) output,Polarizing beam splitter (6) makes the P polarization light component of the laser beam be transmitted to speculum (7),And polarizing beam splitter (6) is reflected back into by speculum (7),Through returning to laser emission part (1 3) by phase-modulator (5) after transmission,And,Polarizing beam splitter (6) reflects the S-polarization light component of the laser beam.
Description
Technical field
The application is related to a kind of LASER Light Source, more particularly to a kind of special LASER Light Source of laser projection.
Background technology
Three color laser are high with its power, and long-life, color rendition degree is high, is increasingly valued by people, as next
For the preferred light source of Projection Display.Current laser projection application is RGB laser semiconductor (LD) array, by optical fiber
Or coupled lens system enters projecting cell and constitutes laser projection system.Semiconductor laser is fine due to its coherence, shadowgraph
Face has very strong speckle phenomena, it is impossible to directly using it as projection light source.The measure taken now is using phase plate or dissipates
Penetrate the elements such as piece and upset its polarization state and phase, reduce its coherence, these measures can only play reduction speckle particle degree and thickness
The effect of degree, it is impossible to be inherently eliminated speckle.We are by the laser projection that is produced with upper type with engineering project
It is also possible that but it is not all right for entering civilian (people need for a long time, to watch repeatedly).
The content of the invention
Developed present invention is directed to the above mentioned problem of prior art.
Embodiments in accordance with the present invention, it is proposed that a kind of special LASER Light Source of laser projection, it is characterised in that including swashing
Light emitting members (1-3), the phase-modulator (5) by being sequentially arranged along light path, polarizing beam splitter (6) and reflection part (7)
The feedback interference system and laser output par, c of composition, wherein, the laser beam that laser emission part (1-3) sends is line
Polarised light, it enters phase-modulator (5), and phase-modulator (5) makes P polarization light component and S-polarization light point in laser beam
The position of amount mutually produces position to differ, so that change the polarization state of laser beam, wherein, from the laser of phase-modulator (5) output
Light beam enters polarizing beam splitter (6), and polarizing beam splitter (6) is transmitted to reflecting part for the P polarization light component for making the laser beam
Part (7), and polarizing beam splitter (6) is reflected back into by reflection part (7), passed through after transmission and laser hair is returned to by phase-modulator (5)
Penetrate part (1-3), also, polarizing beam splitter (6) reflexes to laser output section for the S-polarization light component that makes the laser beam
Point.
Beneficial effects of the present invention are as follows：There is provided the special LASER Light Source of laser projection, noted using semiconductor laser
Enter feedback signal so as to produce chaotic laser light form, by the coherence length reduction of laser, so as to effectively suppress laser speckle.
Brief description of the drawings
Fig. 1 is the structural representation for showing the special LASER Light Source of laser projection according to an embodiment of the invention；
Fig. 2 is the structural representation for showing the special LASER Light Source of laser projection according to another embodiment of the invention
Figure.
Specific embodiment
Technical scheme is further described in detail with reference to the accompanying drawings and detailed description, thus, this
The advantage and feature of invention will be with description and it is apparent.
Although it will be appreciated by those of skill in the art that the following description is related to many of embodiment for the present invention
Ins and outs, but be only for not meaning that any limitation for illustrating the example of principle of the invention.The present invention can be applicable
Occasion outside different from ins and outs exemplified below, without departing from principle of the invention and spirit.
In addition, miscellaneous in order to avoid being limited to the description of this specification, in description in this manual, may pair can be
The portion of techniques details obtained in prior art data has carried out the treatment such as omission, simplification, accommodation, this technology for this area
Be will be understood by for personnel, and this does not interfere with the open adequacy of this specification.
Fig. 1 is the structural representation for showing the special LASER Light Source of laser projection according to an embodiment of the invention.
As shown in figure 1, the special LASER Light Source of laser projection according to an embodiment of the invention mainly includes blue light
LD (laser diode) array 1, feux rouges LD arrays 2, green glow LD arrays 3, collimation lens 4, phase-modulator 5, polarizing beam splitter
6th, speculum 7, color-combination prism (closing color part) 8, collector lens group 9.Wherein, blue, red, green glow LD arrays 1 to 3 each LD is mono-
Unit corresponds to respective one group of collimation lens 4, phase-modulator 5, polarizing beam splitter 6 and speculum 7 respectively.
Wherein, the laser that blue, red, green glow LD arrays 1 to 3 send is collimated respectively via respective collimation lens 4, afterwards
Respectively enter the feedback interference system being made up of phase-modulator 5, polarizing beam splitter 6 and speculum 7.
The direction of phase-modulator 5 is adjusted so that the feedback light from the reflection of speculum 7 to blue, red, green glow LD arrays 1
Interference is formed to 3 laser for sending, and each LD is in chaos state, at this moment blue, red, green glow LD arrays 1 to 3 each send
The interference length of laser can be changed into hundreds of microns from several meters, laser in this state is saturating by color-combination prism 8 and optically focused
After the convergence of microscope group 9 (composition laser output par, c), into projecting cell 10, then through the phase plate in projecting cell 10, expansion
Discrete piece (not shown) etc. is disturbed, it is possible to eliminated due to dissipating on the projection screen for causing capable and experienced related to sex of laser
Spot.Wherein, different feedback work(are needed because different lasers (such as with different Resonant Intake Systems) reaches chaos state
Rate ratio, it is necessary to adjust the angle of the main shaft relative to the polarization direction of laser of phase-modulator 5, in general, between the two
When angle is adjusted between from 0 degree to 45 degree, an angle is inherently found so that laser reaches chaos state.
Specifically, the linearly polarized laser light blue, red, the respective LD of green glow LD arrays 1 to 3 output beam is polarizability high
Beam, by being output as collimated light beam after collimation lens 4 (for example, collimation non-spherical lens), (polarization ratio is up to 120:1), directional light
Beam is by phase-modulator (such as half-wave plate) 5, wherein the P polarization light of parallel polarization light beam and the position phase of S-polarization light component
Between, the optical path difference or 180 ° of position differences of 1/2nd wavelength are produced, its polarization state changes, wherein, polarization state
Change depends primarily on the angle of the major axes orientation with the polarization direction of parallel light beam of phase-modulator 5.Laser beam is passed through
Pass through polarizing beam splitter 6 after crossing phase-modulator 5, wherein, polarizing beam splitter (for example, polarization splitting prism) 6 can be incidence
Laser beam is divided into the vertical linearly polarized light of two beams, and wherein P polarization light passes through completely, and S-polarization light is reflected to 45 degree of angles
Color-combination prism 8, exit direction and P light into an angle of 90 degrees.P polarization light impinges perpendicularly on speculum 7 afterwards by polarizing beam splitter 6,
According to light path principle, each LD is returned to along original optical path.
For example, polarizing beam splitter 6 is formed by a pair of high accuracy right-angle prism gluings, it is coated with the hypotenuse of one of prism
Polarization spectro deielectric-coating, after the S-polarization light of reflection is by color-combination prism 8, the laser beam of three colors is combined into a branch of, passes through
Collector lens group 9 (shaping device) is exported afterwards.
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 generation principle of chaos state laser is illustrated below.
By the major axes orientation for adjusting phase-modulator 5 (half-wave plate), thus it is possible to vary by the laser after half-wave plate two
The allocation proportion of the component on individual polarization direction (P polarization and S-polarization).So, (it is sharp that the chamber is long in the case of different cavity length
The chamber of optical cavity is long, and the laser of different cavity length can just reach chaos state, it is necessary to the ratio of feedback light is different), as above institute
State when feeding back to the P polarization light component of each LD and reaching corresponding proportion relative to the light that each LD sends, now the resonance of LD
State can be disturbed by feedback light, no longer be a stable state, but enter chaos state, and the relevant wavelength of laser will be big under chaos state
Amplitude reduction.It is defeated by oscillograph real-time monitoring laser while the optical axis of half-wave plate is adjusted in actual debugging process
Go out the output frequency of light beam, the adjustment of half-wave plate is stopped once chaos state is formed.Specifically, under lower state, laser is frequently
Rate is in periodic distribution, and intensity distribution is stable.After chaos state is entered, laser frequency no longer has periodically divides
Cloth, observes the waveform similar to noise from the frequency spectrum of oscillograph.
Speculum 7 can be the high reflection plated film film layer on separate reflecting optics, or 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 through collector lens group 9
Enter projecting cell 10, formed without speckle projection image.
Fig. 2 is the structural representation for showing the special LASER Light Source of laser projection according to another embodiment of the invention
Figure.
Compared with the embodiment shown in Fig. 1, the embodiment replaces the color-combination prism 8 to carry out closing light with two panels dichroscope, its
In, the first dichroscope 11 carries out conjunction color to bluish-green laser, bluish-green laser after the pairing color of the second dichroscope 12 and red swashs
Light carries out conjunction color.
Two panels dichroscope can also have other modes of emplacements, if can closing light just can be with.
Finally it should be noted that above specific embodiment is merely illustrative of the technical solution of the present invention and unrestricted, to the greatest extent
Pipe has been described in detail with reference to preferred embodiment to the present invention, it will be understood by those within the art that, can be to this
The technical scheme of invention is modified or equivalent, and without deviating from the spirit and scope of technical solution of the present invention, it all should
Cover among scope of the presently claimed invention.
Claims (8)
1. the special LASER Light Source of a kind of laser projection, it is characterised in that including laser emission part (1-3), by along light path according to
The feedback interference system and laser of the phase-modulator (5), polarizing beam splitter (6) and reflection part (7) composition of secondary arrangement are defeated
Go out part,
Wherein, each diode laser matrix in the laser emission part (1-3) both corresponds to a set of feedback interference
System,
Wherein, the laser beam that each diode laser matrix in laser emission part (1-3) sends is linearly polarized light, and it enters
Enter respective phase-modulator (5), phase-modulator (5) makes the position of the P polarization light component and S-polarization light component in laser beam
Position difference is mutually produced, so that change the polarization state of laser beam,
Wherein, the laser beam from phase-modulator (5) output enters polarizing beam splitter (6), and polarizing beam splitter (6) is for making this
The P polarization light component of laser beam is transmitted to reflection part (7), and reflects back into polarizing beam splitter (6) by reflection part (7),
Through returning to laser emission part (1-3), also, polarizing beam splitter (6) for making the laser light by phase-modulator (5) after transmission
The S-polarization light component of beam reflexes to the laser output par, c,
Wherein, the phase-modulator (5) of each self-corresponding feedback interference system of each diode laser matrix is with adjustable
Major axes orientation.
2. the special LASER Light Source of laser projection according to claim 1, it is characterised in that also including positioned at Laser emission
Collimation lens (4) between part (1-3) and phase-modulator (5), for the multiple that will be sent from laser emission part (1-3)
Laser beam collimation is collimated light beam.
3. the special LASER Light Source of laser projection according to claim 2, it is characterised in that the laser emission part
(1-3) includes blue laser diode array (1), red laser diode array (2) and green laser diode array
(3),
The blue laser diode array (1), red laser diode array (2) and green laser diode array (3)
In each correspond to one group of collimation lens (4) and the feedback interference system,
The laser output par, c includes closing color part (8) and collector lens group (9), wherein, the polarizing beam splitter (6)
S-polarization light component for making the laser beam reflexes to conjunction color part (8), and conjunction color part (8) is for from each
The red, green, blue color laser of individual polarizing beam splitter (6) output carries out conjunction color, and exports to the collector lens group (9),
The collector lens group (9) is exported to projecting cell for that will be assembled from the laser of conjunction color part (8) output
(10)。
4. the special LASER Light Source of laser projection according to claim 1, it is characterised in that the polarizing beam splitter (6)
Formed by a pair of high accuracy right-angle prism gluings, polarization spectro deielectric-coating is coated with the hypotenuse of one of prism.
5. the special LASER Light Source of laser projection according to claim 1 or 3, it is characterised in that the reflection part (7)
It is speculum, the phase-modulator (5) is half-wave plate, its a diameter of 5 to 8mm, the polarizing beam splitter (6) is polarization spectro
Prism, its size is 5mm*5mm*5mm or 8mm*8mm*8mm.
6. the special LASER Light Source of laser projection according to claim 4, it is characterised in that the reflection part (7) by
The high reflection plated film film layer on the rear surface of the polarizing beam splitter (6) is formed.
7. the special LASER Light Source of laser projection according to claim 3, it is characterised in that the conjunction color part (8) is
Color-combination prism.
8. the special LASER Light Source of laser projection according to claim 3, it is characterised in that the conjunction color part (8) by
Two panels dichroscope is constituted.
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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105182674A CN105182674A (en) | 2015-12-23 |
| CN105182674B true 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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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106444068A (en) * | 2016-06-24 | 2017-02-22 | 天津大学 | Laser speckle inhibition method |
| 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 |
| CN108803221B (en) * | 2018-06-25 | 2020-11-17 | 太原理工大学 | Laser light source of laser projector |
| WO2020057124A1 (en) | 2018-09-19 | 2020-03-26 | 青岛海信激光显示股份有限公司 | Laser array, laser light source and laser projection device |
| 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 |
| CN109782517B (en) * | 2019-01-25 | 2021-01-01 | 太原理工大学 | Method and device for generating low coherent light by broadband chaotic modulation in laser display |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001314991A (en) * | 2000-05-09 | 2001-11-13 | Sumitomo Heavy Ind Ltd | Laser beam processing method and mask optical system used therefor |
| US7193765B2 (en) * | 2005-03-31 | 2007-03-20 | Evans & Sutherland Computer Corporation | Reduction of speckle and interference patterns for laser projectors |
| US8226247B2 (en) * | 2007-06-12 | 2012-07-24 | Panasonic Corporation | Projection type image display device |
| CN101493582B (en) * | 2009-02-23 | 2010-10-13 | 福州高意通讯有限公司 | Optical structure for eliminating laser speckle |
| JP5751098B2 (en) * | 2010-09-08 | 2015-07-22 | 旭硝子株式会社 | Projection display |
| CN102231042B (en) * | 2011-06-22 | 2013-05-01 | 贺银波 | Light engine system for reflective liquid crystal projection display |
| CN102436073A (en) * | 2011-09-28 | 2012-05-02 | 中国科学院半导体研究所 | Projection lighting optical path based on semiconductor laser array |
| CN203645134U (en) * | 2013-12-20 | 2014-06-11 | 合肥京东方光电科技有限公司 | Display device |
| CN104914659A (en) * | 2015-06-08 | 2015-09-16 | 合肥恒锐光电科技有限公司 | Laser projection optical engine having high integration density |
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