CN108803221B - Laser light source of laser projector - Google Patents
Laser light source of laser projector Download PDFInfo
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- CN108803221B CN108803221B CN201810660442.7A CN201810660442A CN108803221B CN 108803221 B CN108803221 B CN 108803221B CN 201810660442 A CN201810660442 A CN 201810660442A CN 108803221 B CN108803221 B CN 108803221B
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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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
- G03B21/2013—Plural light sources
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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
- G03B21/206—Control of light source other than position or intensity
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Projection Apparatus (AREA)
- Laser Surgery Devices (AREA)
- Semiconductor Lasers (AREA)
Abstract
The invention discloses a laser light source of a laser projector, which comprises a plurality of groups of laser emitting components, a plurality of groups of speckle suppression devices, a laser output part and a projection unit, wherein each group of laser emitting components consists of a homochromatic laser diode array; each group of laser emission components is provided with a group of speckle suppression devices along respective optical paths, and a laser output part and a projection unit are arranged behind the speckle suppression devices in sequence; the speckle suppression device comprises a converging lens, a diaphragm, a collimating lens and a transflective lens which are sequentially arranged along a light path, after laser reaches the transflective lens, the reflected light of the transflective lens returns the converged laser to a corresponding laser diode in a laser emitting component to form feedback, meanwhile, light of other laser diodes in the laser emitting component also enters the laser diode to form multi-light injection, chaos is generated, and the transmitted light of the transflective lens is directly output to a laser output part as a low-coherence light source.
Description
Technical Field
The invention relates to the field of laser light sources, in particular to a laser light source of a laser projector.
Background
Three-color laser has high power, long service life and high color reduction degree, is more and more emphasized by people, and becomes the first choice light source for next generation projection display. Currently, a red, green and blue laser semiconductor (LD) array is used in a laser projector, and enters a projection unit through an optical fiber or a coupling lens system to form a laser projection system. Because of its good coherence, the projected picture has strong speckle phenomenon, so it can not be directly used as projection light source. The existing measures are to disturb the polarization state and phase of the speckle by using elements such as a phase plate or a scattering plate and the like, and reduce the coherence of the speckle, and the measures only have the effect of reducing the granularity and the thickness of the speckle and cannot fundamentally eliminate the speckle. The laser projector produced by the method can be used in engineering projects, but cannot enter civilian use (people need to watch for a long time and repeatedly). There is therefore a need for a laser source for a laser projector suitable for civil use.
Disclosure of Invention
The invention provides a laser light source of a laser projector, aiming at solving the problem that the existing laser projector is suitable for engineering projects and is not suitable for civil use.
The invention is realized by the following technical scheme: a laser light source of a laser projector comprises a plurality of groups of laser emission components, a plurality of groups of speckle suppression devices, a laser output part and a projection unit, wherein each group of laser emission components consists of a homochromatic laser diode array; each group of laser emission components is provided with a group of speckle suppression devices along respective optical paths, and a laser output part and a projection unit are arranged behind the speckle suppression devices in sequence; the speckle suppression device comprises a convergent lens, a diaphragm, a collimating lens and a reflecting mirror which are sequentially arranged along a light path, wherein the convergent lens, the diaphragm, the collimating lens and the reflecting mirror are coaxially arranged; each group of laser emitting components emits collimated light laser beams, the emitting direction of the collimated light laser beams is parallel to the axes of all optical devices in the speckle suppression device, the collimated light laser beams enter a converging lens to be converged, then pass through a light through hole of a diaphragm, then are collimated by a collimating lens and are incident on a reflecting mirror, the converged laser is returned to a corresponding laser diode in the laser emitting components by the reflected light of the reflecting mirror to form feedback, meanwhile, the light of other laser diodes in the laser emitting components also enters the laser diode to form multi-light injection to generate a chaotic state, and the transmitted light of the reflecting mirror is directly output to a laser output part as a low-coherence light source; the laser output part comprises a color combination component and a condenser lens group which are sequentially arranged along an optical path.
The invention relates to a laser light source of a laser projector, which comprises a laser emitting component consisting of a plurality of groups of conventional laser generators, a plurality of groups of speckle suppression devices, a conventional laser output part and a projection unit, wherein the laser generators emit linearly polarized light, the speckle suppression devices are a convergent lens, a diaphragm, a collimating lens and a transflective lens which are sequentially arranged along a light path, in order to ensure that the light path can be output according to a set route, the convergent lens, the diaphragm, the collimating lens and the transflective lens are coaxially arranged, each group of laser emitting components consists of a homochromatic laser diode array, which means that a plurality of laser diodes are provided, the laser beams emitted by the plurality of laser diodes in each group of laser emitting components are collimated laser beams, the emitting direction is parallel to the axes of all optical devices in the speckle suppression devices, and the laser beams are incident to the convergent lens for convergence, and then the laser passes through a light through hole of the diaphragm, is collimated by the collimating lens and is incident on the reflecting mirror, the reflected light of the reflecting mirror returns the converged laser to the corresponding laser diode in the laser emitting component to form feedback, and simultaneously, the light of other laser diodes in the laser emitting component also enters the laser diode to form multi-light injection, so that each laser diode is simultaneously influenced by the injection of other lasers under the action of light feedback to generate a chaotic state, and the transmitted light of the reflecting mirror is directly output to a laser output part as a low-coherence light source. Because the laser is disturbed by the outside, the generated laser enters a chaotic state, the laser is returned to the laser by the reflection of the transflective mirror to be disturbed, and simultaneously, the transmitted laser mode can be increased by the action of the diaphragm, so that the feedback reaches the action of multipath feedback, the coherence of the laser is reduced from a space domain by the increase of the path, and the coherence of the laser is reduced from a time domain by the chaotic state; and the multi-path feedback can make the laser more easily enter a chaotic state, and the generated chaotic laser is more complex. Because the laser output part comprises the color combination component and the condenser lens group, laser beams emitted by the multiple groups of laser emission components are combined into a beam of light through the color combination component and output to the projection unit after passing through the condenser lens group, and the condenser lens group is a shaping device. The invention has the following specific operations: laser emitted from each group of laser emitting components passes through the speckle suppression device corresponding to each group of laser emitting components, a part of laser returns to the laser diode inside the laser reflecting component to form feedback, light fed back by the rest of laser diodes also enters the laser diode to form multi-light injection, thus each laser diode is simultaneously influenced by the injection of the other laser diodes under the action of light feedback to generate a chaotic state, transmitted light of the reflecting mirror is directly output to the laser output component as a low-coherence light source, and laser beams of a plurality of colors are combined into one beam after passing through the color combination component and are output to the projection unit after being converged and shaped through the condensing lens group.
The existing projectors project by adopting three colors of red, green and blue, so that a plurality of groups of laser emitting components comprise a group of blue laser diode arrays, a group of red laser diode arrays and a group of green laser diode arrays, and each group of laser diode arrays corresponds to a group of speckle suppression devices.
Preferably, in order to make the chaotic light effect better, the distance between the convergent lens and the diaphragm is the focal length of the convergent lens; and the distance between the diaphragm and the collimating lens is the focal length of the collimating lens.
Preferably, the diaphragm is replaced by a homogeneous light through pipe or a multimode fiber, and the homogeneous light through pipe or the multimode fiber can play the same role as the diaphragm and has better effect, so the diaphragm can be replaced by any one of the two devices.
Compared with the prior art, the invention has the following beneficial effects: in a multicolor laser projector, a laser emitting component of each color in a plurality of colors uses a form of combining light feedback and light injection to enable a laser to generate chaotic laser, so that the time coherence of the laser is reduced, meanwhile, the coherence of the laser is reduced in space by utilizing multiple paths formed by diaphragms, and finally, a time-space incoherent light source is realized. In the invention, each laser diode receives the feedback light of the laser diode and simultaneously receives the injected light from all other lasers, so that more interference sources are generated, the chaotic effect is better (the bandwidth is wider, the randomness is better, and the autocorrelation sidelobe is lower), and the laser projector has larger space for civil use.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.
The figures are labeled as follows:
the system comprises a 1-convergent lens, a 2-diaphragm, a 3-collimating lens, a 4-transflective lens, a 5-blue laser diode array, a 6-red laser diode array, a 7-green laser diode array, an 8-color combination component, a 9-condenser lens group, a 10-projection unit, an 11-second dichroic mirror and a 12-first dichroic mirror.
Detailed Description
The present invention is further illustrated by the following specific examples.
A laser light source of a laser projector comprises a plurality of groups of laser emitting components, a plurality of groups of speckle suppression devices, a laser output part and a projection unit 10, wherein each group of laser emitting components consists of a homochromatic laser diode array; each group of laser emission components is provided with a group of speckle suppression devices along respective optical paths, and a laser output part and a projection unit 10 are arranged behind the speckle suppression devices in sequence; the speckle suppression device comprises a convergent lens 1, a diaphragm 2, a collimating lens 3 and a reflecting mirror 4 which are sequentially arranged along a light path, wherein the convergent lens 1, the diaphragm 2, the collimating lens 3 and the reflecting mirror 4 are coaxially arranged; each group of laser emission components emits collimated light laser beams, the emitting direction of the collimated light laser beams is parallel to the axes of all optical devices in the speckle suppression device, the collimated light laser beams enter the convergent lens 1 to be converged, then pass through the light through hole of the diaphragm 2, then are collimated through the collimating lens 3 and are incident on the transmitting mirror 4, the reflected light of the transmitting mirror 4 returns the converged laser to the corresponding laser diode in the laser emission components to form feedback, meanwhile, the light of other laser diodes in the laser emission components also enters the laser diode to form multi-light injection to generate a chaotic state, and the transmitted light of the transmitting mirror 4 is directly output to the laser output part as a low-coherence light source; the laser output section includes a color combining member 8 and a condenser lens group 9 arranged in this order along the optical path.
Preferably, the plurality of groups of laser emitting components comprise a group of blue laser diode arrays 5, a group of red laser diode arrays 6 and a group of green laser diode arrays 7, and each group of laser diode arrays corresponds to a group of speckle suppression devices; the distance between the convergent lens 1 and the diaphragm 2 is the focal length of the convergent lens 1; the distance between the diaphragm 2 and the collimating lens 3 is the focal length of the collimating lens 3; the convergent lens 1 is a high-curvature uniform convergent lens, and the focal length is 0.3-10 mm; the light-passing aperture of the diaphragm 2 is 0.1-5 mm; the focal length of the collimating lens 3 is 0.3-3 mm; the reflectivity of the transflective mirror 4 is 5% -50%; the distance between the collimating lens 3 and the reflecting mirror 4 is 0-20 mm; the color combination component is a color combination prism or consists of two dichroic mirrors; the diaphragm 2 is replaced by a homogeneous light through pipe or a multimode optical fiber.
The first embodiment is as follows:
the preferred scheme is adopted in the embodiment: as shown in fig. 1, the plurality of groups of laser emitting components include a group of blue laser diode arrays 5, a group of red laser diode arrays 6, and a group of green laser diode arrays 7, and each group of laser diode arrays corresponds to a group of speckle suppression devices; the distance between the convergent lens 1 and the diaphragm 2 is the focal length of the convergent lens 1; the distance between the diaphragm 2 and the collimating lens 3 is the focal length of the collimating lens 3; the convergent lens 1 is a high-curvature uniform convergent lens with a focal length of 5 mm; the light-transmitting aperture of the diaphragm 2 is 2 mm; the focal length of the collimating lens 3 is 1.5 mm; the reflectivity of the reflecting mirror 4 is 20 percent, and the collimating lens 3 and the reflecting mirror 4 are tightly attached and fixed; the color combining member is a color combining prism.
The embodiment specifically operates as follows: blue laser diode array 5, red laser diode array 6, green laser diode array 7, collimated light laser beams emitted by the three groups of laser diode arrays pass through the speckle suppression devices corresponding to the collimated light laser beams in parallel, namely, a part of laser returns to a laser diode inside the laser reflection component to form feedback after sequentially passing through a convergent lens 1, a diaphragm 2, a collimating lens 3 and a transflective lens 4, the light fed back by the other laser diodes also enters the laser diodes to form multi-light injection, thus each laser diode is simultaneously influenced by the injection of other laser diodes under the action of light feedback to generate a chaotic state, the transmitted light of the transreflector 4 is directly output to a laser output part as a low-coherence light source and is output to a laser output part after passing through a color-combination prism, the laser beams of a plurality of colors are combined into one beam, converged and shaped by the condenser lens group 9, and then output to the projection unit 10.
Example two:
the preferred scheme is adopted in the embodiment: as shown in fig. 2, the plurality of groups of laser emitting components include a group of blue laser diode arrays 5, a group of red laser diode arrays 6, and a group of green laser diode arrays 7, and each group of laser diode arrays corresponds to a group of speckle suppression devices; the diaphragm 2 is replaced by a multimode optical fiber; the distance between the convergent lens 1 and the multimode fiber is the focal length of the convergent lens 1; the distance between the multimode optical fiber and the collimating lens 3 is the focal length of the collimating lens 3; the convergent lens 1 is a high-curvature uniform convergent lens with a focal length of 7 mm; the light transmission caliber of the multimode optical fiber is 1.6 mm; the focal length of the collimating lens 3 is 0.9 mm; the reflectivity of the reflecting mirror 4 is 40%, and the distance between the collimating lens 3 and the reflecting mirror 4 is set to be 10 mm; the color combining component is a two-piece dichroic mirror.
The embodiment specifically operates as follows: blue laser diode array 5, red laser diode array 6, green laser diode array 7, the parallel axis of the collimated light laser beam emitted by three groups of laser diode arrays passes through their respective speckle suppression devices, i.e. sequentially passes through converging lens 1, multimode fiber, collimating lens 3 and transflective mirror 4, a part of laser returns to the laser diode inside the laser reflection component to form feedback, the light fed back by the other laser diodes also enters the laser diode to form multiple light injection, thus each laser diode is simultaneously influenced by the injection of other laser diodes under the action of light feedback to generate chaotic state, the transmitted light of the transflective mirror 4 is directly output to the laser output part as a low-coherence light source, compared with the embodiment shown in fig. 1, the embodiment uses two dichroic mirrors to replace a color-combining prism to combine light, the first dichroic mirror 12 combines blue-green laser light, the second dichroic mirror 11 combines blue-green laser light and red laser light after color combination, laser beams of a plurality of colors are combined into one beam after passing through the first dichroic mirror 12 and the second dichroic mirror 11, and the laser beams are converged and shaped through the condenser lens group 9 and then output to the projection unit 10.
The scope of the invention is not limited to the above embodiments, and various modifications and changes may be made by those skilled in the art, and any modifications, improvements and equivalents within the spirit and principle of the invention should be included in the scope of the invention.
Claims (10)
1. A laser light source of a laser projector is characterized in that: the device comprises a plurality of groups of laser emitting components, a plurality of groups of speckle suppression devices, a laser output part and a projection unit (10), wherein each group of laser emitting components consists of a homochromatic laser diode array; each group of laser emission components is provided with a group of speckle suppression devices along respective optical paths, and a laser output part and a projection unit (10) are sequentially arranged behind the speckle suppression devices;
the speckle suppression device comprises a convergent lens (1), a diaphragm (2), a collimating lens (3) and a reflecting mirror (4) which are sequentially arranged along a light path, wherein the convergent lens (1), the diaphragm (2), the collimating lens (3) and the reflecting mirror (4) are coaxially arranged; each group of laser emitting components emits collimated light laser beams, the emitting direction of the collimated light laser beams is parallel to the axes of all optical devices in the speckle suppression device, the collimated light laser beams enter a converging lens (1) to be converged, then pass through a light through hole of a diaphragm (2), then pass through a collimating lens (3) to be collimated, and are incident on a transmitting mirror (4), the reflected light of the transmitting mirror (4) returns the converged laser to a corresponding laser diode in the laser emitting components to form feedback, meanwhile, the light of other laser diodes in the laser emitting components also enters the laser diode to form multi-light injection, a chaotic state is generated, and the transmitted light of the transmitting mirror (4) is directly output to a laser output part as a low-coherence light source;
the laser output part comprises a color combination component (8) and a condenser lens group (9) which are sequentially arranged along an optical path.
2. The laser light source of the laser projector according to claim 1, characterized in that: the plurality of groups of laser emitting components comprise a group of blue laser diode arrays (5), a group of red laser diode arrays (6) and a group of green laser diode arrays (7), and each group of laser diode arrays corresponds to one group of speckle suppression devices.
3. The laser light source of the laser projector according to claim 1, characterized in that: the distance between the convergent lens (1) and the diaphragm (2) is the focal length of the convergent lens (1); the distance between the diaphragm (2) and the collimating lens (3) is the focal length of the collimating lens (3).
4. The laser light source of the laser projector according to claim 1, characterized in that: the convergent lens (1) is a high-curvature uniform convergent lens, and the focal length is 0.3-10 mm; the light-passing aperture of the diaphragm (2) is 0.1-5 mm.
5. The laser light source of the laser projector according to claim 1, characterized in that: the focal length of the collimating lens (3) is 0.3-3 mm.
6. The laser light source of the laser projector according to claim 1, characterized in that: the reflectivity of the transflective mirror (4) is 5% -50%.
7. The laser light source of the laser projector according to claim 1, characterized in that: the distance between the collimating lens (3) and the reflecting mirror (4) is 0-20 mm.
8. The laser light source of the laser projector according to claim 7, wherein: the collimating lens (3) and the reflecting mirror (4) are tightly attached and fixed.
9. The laser light source of the laser projector according to claim 1, characterized in that: the color combination component (8) is a color combination prism or consists of two dichroic mirrors.
10. A laser light source of a laser projector according to any one of claims 1 to 9, characterized in that: the diaphragm (2) is replaced by a homogeneous light through pipe or a multimode optical fiber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810660442.7A CN108803221B (en) | 2018-06-25 | 2018-06-25 | Laser light source of laser projector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810660442.7A CN108803221B (en) | 2018-06-25 | 2018-06-25 | Laser light source of laser projector |
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| CN108803221A CN108803221A (en) | 2018-11-13 |
| CN108803221B true CN108803221B (en) | 2020-11-17 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638641B (en) * | 2019-01-25 | 2021-04-02 | 太原理工大学 | Method and device for eliminating speckles in laser display by using chaotic circuit modulation laser |
| CN109683340B (en) * | 2019-01-25 | 2021-05-04 | 太原理工大学 | Chaotic modulation speckle-free laser projector |
| 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 |
| CN110082928B (en) * | 2019-04-30 | 2022-01-11 | 中北大学 | Laser speckle dissipating device based on combination of polarization diversity and angle diversity |
| CN110133953A (en) * | 2019-06-14 | 2019-08-16 | 山西莱柏莱特电子科技有限公司 | A kind of laser is applied to the projection laser beam merging apparatus of wide wavestrip ray machine type |
| CN113885282B (en) * | 2020-07-02 | 2023-06-13 | 苏州佳世达光电有限公司 | Projector with a light source |
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| JPH06268303A (en) * | 1993-03-11 | 1994-09-22 | Olympus Optical Co Ltd | Optical chaos generator |
| CN105182674A (en) * | 2015-10-28 | 2015-12-23 | 中视迪威激光显示技术有限公司 | Laser light source special for laser projector |
| CN105762646A (en) * | 2016-04-20 | 2016-07-13 | 太原理工大学 | Semiconductor chaotic laser integrated with double feedback |
| CN205543685U (en) * | 2016-04-20 | 2016-08-31 | 太原理工大学 | Chaos semiconductor laser of module integration of anti - mirror is passed through in area |
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| US5315603A (en) * | 1993-01-11 | 1994-05-24 | The United States Of America As Represented By The Secretary Of The Air Force | Backscatter absorption for laser diodes |
| JPH06268303A (en) * | 1993-03-11 | 1994-09-22 | Olympus Optical Co Ltd | Optical chaos generator |
| CN105182674A (en) * | 2015-10-28 | 2015-12-23 | 中视迪威激光显示技术有限公司 | Laser light source special for laser projector |
| CN105762646A (en) * | 2016-04-20 | 2016-07-13 | 太原理工大学 | Semiconductor chaotic laser integrated with double feedback |
| CN205543685U (en) * | 2016-04-20 | 2016-08-31 | 太原理工大学 | Chaos semiconductor laser of module integration of anti - mirror is passed through in area |
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