CN111880315A - Laser lighting equipment - Google Patents
Laser lighting equipment Download PDFInfo
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- CN111880315A CN111880315A CN202010805483.8A CN202010805483A CN111880315A CN 111880315 A CN111880315 A CN 111880315A CN 202010805483 A CN202010805483 A CN 202010805483A CN 111880315 A CN111880315 A CN 111880315A
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- laser
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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
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
- G02B27/0961—Lens arrays
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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
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0916—Adapting the beam shape of a semiconductor light source such as a laser diode or an LED, e.g. for efficiently coupling into optical fibers
-
- 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
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
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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
Abstract
The application discloses laser lighting apparatus includes: the laser is used for emitting laser beams which enter the optical fiber through coupling; an optical fiber for transmitting a laser beam; the collimating optical system is used for collimating the laser beam emitted by the optical fiber and illuminating the laser beam to the surface of the random micro-lens array; the random micro-lens array is used for homogenizing and shaping the laser beam, emitting a beam with a fixed divergence angle and entering the angle adjusting optical system; and the angle adjusting optical system is used for adjusting the emergent light beam of the random micro-lens array into a required divergence angle and then emitting the emergent light beam. The invention adopts the random micro-lens array to homogenize and shape the laser beam, can enable the emergent beam to be in a fixed divergence angle range, improve the light energy utilization rate, and reduce the coherence of the beam to a certain extent, thereby reducing the speckle effect, further improving the quality of the shaped light spot, and simultaneously, the emergent beam of the random micro-lens array is adjusted by utilizing the angle adjusting optical system to control the final emergent beam angle.
Description
Technical Field
The invention relates to the technical field of optics, in particular to laser lighting equipment.
Background
Laser has the characteristics of high brightness, narrow spectral width, good directivity and the like, and has the unique advantages when being used for illumination. The laser illumination technology is widely applied to the fields of national defense engineering, aerospace engineering, night vision monitoring, laser display and the like, but laser monochromaticity is good, extremely strong coherence exists, laser speckles can be generated when the laser is illuminated on the surface of an object, and simultaneously, the divergence angle of a fast axis and a slow axis of laser output by a commonly used semiconductor laser is large in difference, so that uniform circular light spots cannot be output. The light spots output by the method of coupling into the optical fiber for output generally present gaussian distribution, and cannot present better uniformity on the required illumination surface.
In view of the problem of uniformity in laser illumination, the current methods for homogenizing and shaping laser mainly use ground glass, aspheric lens group, microlens array, diffractive optical element, birefringent lens group, and light homogenizing rod. The ground glass forms random scattering through a glass surface fine structure to homogenize laser; the aspheric lens group shapes the Gaussian beam through one or more aspheric lenses and then is collimated and output by the other lens; the micro lens array divides an incident beam into a plurality of sub beams, and the sub beams are overlapped on a handle surface by a plurality of spherical mirrors; the diffraction optical element is processed by a continuous relief structure of a multi-step phase structure approximate hologram, and beam shaping is carried out by utilizing diffraction optics, so that a round Gaussian beam can be shaped into a square, a ring or even any shape; the light homogenizing rod homogenizes the laser light through multiple total reflections of the light source inside the glass. However, due to the random scattering of the ground glass, the coherence of each sub-beam output by the aspheric lens and the micro-lens array is high, the speckle phenomenon is serious, and the diffraction optical element can only realize the required spot shape and uniformity within a certain distance range, so the overall effect is not ideal.
Therefore, how to reduce laser speckle and improve the quality of the shaped light spot is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of this, the present invention provides a laser lighting device, which can improve the light energy utilization rate, reduce the speckle effect, improve the quality of the shaped light spot, and realize the outgoing light beam with any divergence angle. The specific scheme is as follows:
a laser lighting device comprising:
the laser is used for emitting laser beams which enter the optical fiber through coupling;
the optical fiber is used for transmitting the laser beam;
the collimation optical system is used for collimating the laser beam emitted by the optical fiber and illuminating the laser beam to the surface of the random micro-lens array;
the random micro-lens array is used for homogenizing and shaping the laser beam, emitting a beam with a fixed divergence angle and entering an angle adjusting optical system;
and the angle adjusting optical system is used for adjusting the emergent light beam of the random micro-lens array into a required divergence angle and then emitting the emergent light beam.
Preferably, in the above laser lighting apparatus provided by the embodiment of the present invention, the collimating optical system includes a lens group composed of a first meniscus lens, a second meniscus lens, and a third meniscus lens.
Preferably, in the above laser lighting apparatus provided by the embodiment of the present invention, one side of the surface of the random microlens array is a plane, and the other side of the surface of the random microlens array is a microlens array with a random radius.
Preferably, in the above laser lighting apparatus provided by the embodiment of the present invention, the fixed divergence angle of the outgoing beam of the random microlens array ranges from 1 ° to 20 °.
Preferably, in the above laser illumination apparatus provided by the embodiment of the present invention, the angle adjustment optical system adopts a near-double telecentric structure.
Preferably, in the above laser lighting apparatus provided by an embodiment of the present invention, the angle adjustment optical system includes a lens group composed of a first biconvex lens, a second biconvex lens, and a fourth meniscus lens.
Preferably, in the above laser lighting apparatus provided by the embodiment of the present invention, the laser has a wavelength in a range of 400nm to 1500nm and a power in a range of 0.1W to 60W.
Preferably, in the above laser illumination apparatus provided by an embodiment of the present invention, the optical fiber has a diameter ranging from 50 μm to 400 μm and an NA ranging from 0.12 to 0.25.
As can be seen from the above technical solutions, the laser lighting apparatus provided by the present invention includes: the laser is used for emitting laser beams which enter the optical fiber through coupling; an optical fiber for transmitting a laser beam; the collimating optical system is used for collimating the laser beam emitted by the optical fiber and illuminating the laser beam to the surface of the random micro-lens array; the random micro-lens array is used for homogenizing and shaping the laser beam, emitting a beam with a fixed divergence angle and entering the angle adjusting optical system; and the angle adjusting optical system is used for adjusting the emergent light beam of the random micro-lens array into a required divergence angle and then emitting the emergent light beam.
The invention adopts the random micro-lens array to homogenize and shape the laser beam, can ensure that the emergent beam is in a fixed divergence angle range, improve the light energy utilization rate, and reduce the coherence of the beam to a certain extent, thereby reducing the speckle effect, maintaining the required shape and uniformity at any distance, further improving the quality of the shaped light spot, and simultaneously, the emergent beam of the random micro-lens array is adjusted by utilizing an angle adjusting optical system, the final emergent beam angle is controlled, and the emergent beam of any divergence angle is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or technical solutions in related arts, the drawings used in the description of the embodiments or related arts will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a laser lighting apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention provides a laser lighting device, as shown in fig. 1, comprising:
the laser is used for emitting laser beams which enter the optical fiber 1 through coupling;
an optical fiber 1 for transmitting a laser beam;
the collimating optical system 2 is used for collimating the laser beam emitted by the optical fiber 1 and illuminating the laser beam to the surface of the random micro-lens array 3;
the random micro-lens array 3 is used for homogenizing and shaping the laser beam, emitting a beam with a fixed divergence angle and entering the angle adjusting optical system 4;
and an angle adjusting optical system 4 for adjusting the light beam emitted from the random micro-lens array 3 to a desired divergence angle and then emitting the light beam.
In the above laser lighting device provided by the embodiment of the present invention, the laser beam emitted by the laser enters one end of the optical fiber through coupling, is output through the other end of the optical fiber, is collimated by the collimating optical system to illuminate the rear surface of the random microlens array, is shaped by the random microlens array to emit a beam with a fixed divergence angle, and is controlled by the angle adjusting optical system to emit the beam, so that the laser beam is homogenized and shaped by the random microlens array, the light energy utilization rate can be improved within a fixed divergence angle range for the emitted beam, the coherence of the beam can be reduced to a certain extent, the speckle effect can be reduced, the required shape and uniformity can be maintained at any distance, the quality of the shaped light spot can be further improved, and the emitted beam of the random microlens array can be adjusted by the angle adjusting optical system to control the final emitted beam angle, realizing the emergent light beam with any divergence angle.
In practical implementation, in the above-mentioned laser illumination apparatus provided by the embodiment of the present invention, as shown in fig. 1, the collimating optical system 2 may include a lens group consisting of a first meniscus lens 21, a second meniscus lens 22, and a third meniscus lens 23. Preferably, the focal length of the lens group may be 28.64mm, and the divergence angle after collimation may be 1 °. It should be noted that the collimating optical system 2 achieves the function of collimating an angle of 2 ° or less according to the different optical fibers selected, and the specific design parameters may be determined according to the actual situation, and are not limited herein.
In practical implementation, in the above laser lighting apparatus provided by the embodiment of the present invention, as shown in fig. 1, one side of the surface of the random microlens array 3 may be set to be a plane, and the other side may be set to be a microlens array having a random radius. Specifically, the fixed divergence angle of the outgoing light beam of the random microlens array 3 may range from 1 ° to 20 °, that is, the divergence angle of the random microlens array 3 may be arbitrarily selected between 1 ° and 20 °, and the thickness and the diameter are not particularly required. Preferably, the random microlens array has a divergence angle of 10 ° all over, is circular in shape, has a thickness of 2mm and a diameter of 13mm, and is made of quartz glass.
In specific implementation, in the above laser lighting apparatus provided by the embodiment of the present invention, in order to ensure that the uniformity of the light spots emitted from the random microlens array remains unchanged after passing through the angle adjustment optical system, the angle adjustment optical system 4 may adopt a near-double telecentric structure. As shown in fig. 1, the angle adjustment optical system 4 may include a lens group composed of a first biconvex lens 41, a second biconvex lens 42, and a fourth meniscus lens 43. Preferably, the angle adjusting optical system 4 has an exit angle of 30 ° at the full angle, and an exit window of 3.73 mm. The angle adjustment optical system is designed in a way that the object side (the side of the random micro-lens array) is telecentric and the image side is similar to a telecentric structure, so that the brightness uniformity of emergent light spots of the random micro-lens array can be kept unchanged. It should be noted that, the angle adjustment optical system may select different specific design parameters according to the size of the selected random microlens array, the divergence angle of the outgoing beam, and the divergence angle of the outgoing beam finally required.
In a specific implementation, in the laser lighting apparatus provided in the embodiment of the present invention, the wavelength of the laser may be in a range from 400nm to 1500nm, and the power of the laser may be in a range from 0.1W to 60W, that is, the wavelength of the laser may be arbitrarily selected from 400nm to 1500nm, and the power of the laser may be arbitrarily selected from a range from 0.1W to 60W. Preferably, the laser is selected to have a wavelength of 850nm and a power of 1W.
In practical applications, in the above laser illumination apparatus provided in the embodiments of the present invention, the diameter of the optical fiber may range from 50 μm to 400 μm, and the NA may range from 0.12 to 0.25, that is, the diameter of the optical fiber may be arbitrarily selected from 50 μm to 400 μm, and the NA may be arbitrarily selected from 0.12 to 0.25. Preferably, the core diameter of the optical fiber is 100 μm and the NA value is 0.22.
The embodiment of the invention provides laser lighting equipment, which comprises: the laser is used for emitting laser beams which enter the optical fiber through coupling; an optical fiber for transmitting a laser beam; the collimating optical system is used for collimating the laser beam emitted by the optical fiber and illuminating the laser beam to the surface of the random micro-lens array; the random micro-lens array is used for homogenizing and shaping the laser beam, emitting a beam with a fixed divergence angle and entering the angle adjusting optical system; and the angle adjusting optical system is used for adjusting the emergent light beam of the random micro-lens array into a required divergence angle and then emitting the emergent light beam. The invention adopts the random micro-lens array to homogenize and shape the laser beam, can ensure that the emergent beam is in a fixed divergence angle range, improve the light energy utilization rate, and reduce the coherence of the beam to a certain extent, thereby reducing the speckle effect, maintaining the required shape and uniformity at any distance, further improving the quality of the shaped light spot, and simultaneously, the emergent beam of the random micro-lens array is adjusted by utilizing an angle adjusting optical system, the final emergent beam angle is controlled, and the emergent beam of any divergence angle is realized.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The laser lighting device provided by the present invention is described in detail above, and the principle and the embodiment of the present invention are explained herein by applying specific examples, and the above description of the examples is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A laser lighting apparatus, comprising:
the laser is used for emitting laser beams which enter the optical fiber through coupling;
the optical fiber is used for transmitting the laser beam;
the collimation optical system is used for collimating the laser beam emitted by the optical fiber and illuminating the laser beam to the surface of the random micro-lens array;
the random micro-lens array is used for homogenizing and shaping the laser beam, emitting a beam with a fixed divergence angle and entering an angle adjusting optical system;
and the angle adjusting optical system is used for adjusting the emergent light beam of the random micro-lens array into a required divergence angle and then emitting the emergent light beam.
2. The laser illumination apparatus according to claim 1, wherein the collimating optical system includes a lens group consisting of a first meniscus lens, a second meniscus lens, and a third meniscus lens.
3. The laser illumination apparatus according to claim 1, wherein the surface of the random microlens array is a plane on one side and a microlens array having a random radius on the other side.
4. The laser illumination apparatus according to claim 3, wherein the fixed divergence angle of the random microlens array exit beam is in a range of 1 ° to 20 °.
5. The laser illumination apparatus according to claim 1, wherein the angle adjustment optical system employs a near-double telecentric structure.
6. The laser illumination apparatus according to claim 5, wherein the angle adjustment optical system includes a lens group composed of a first biconvex lens, a second biconvex lens, and a fourth meniscus lens.
7. The laser lighting device of claim 1, wherein the laser has a wavelength in the range of 400nm to 1500nm and a power in the range of 0.1W to 60W.
8. The laser illumination apparatus according to claim 1, wherein the optical fiber has a diameter in a range of 50 μm to 400 μm and an NA in a range of 0.12 to 0.25.
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|---|---|---|---|
| CN202010805483.8A CN111880315A (en) | 2020-08-12 | 2020-08-12 | Laser lighting equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010805483.8A CN111880315A (en) | 2020-08-12 | 2020-08-12 | Laser lighting equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112731750A (en) * | 2020-12-31 | 2021-04-30 | 杭州中科极光科技有限公司 | Laser light source and laser display system |
| CN113625508A (en) * | 2021-08-18 | 2021-11-09 | 长春电子科技学院 | High-zoom-ratio illumination optical system |
| CN114460755A (en) * | 2020-11-09 | 2022-05-10 | 西安立芯光电科技有限公司 | Semiconductor laser dodging technology and module |
| WO2023201596A1 (en) * | 2022-04-20 | 2023-10-26 | 华为技术有限公司 | Detection apparatus and terminal device |
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Application publication date: 20201103 |