CN113534586A - Laser light source - Google Patents
Laser light source Download PDFInfo
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- CN113534586A CN113534586A CN202010307318.XA CN202010307318A CN113534586A CN 113534586 A CN113534586 A CN 113534586A CN 202010307318 A CN202010307318 A CN 202010307318A CN 113534586 A CN113534586 A CN 113534586A
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- 230000003287 optical effect Effects 0.000 claims abstract description 45
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- 239000013307 optical fiber Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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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
- G03B21/208—Homogenising, shaping of the illumination light
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
- F21V5/043—Refractors for light sources of lens shape the lens having cylindrical faces, e.g. rod lenses, toric lenses
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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
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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
- G02B27/0922—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 the semiconductor light source comprising an array of light emitters
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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
- G02B27/0966—Cylindrical lenses
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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
-
- 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
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/30—Semiconductor lasers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Optical Couplings Of Light Guides (AREA)
- Semiconductor Lasers (AREA)
Abstract
本发明公开了一种激光光源，该激光光源包括依次排列设置的激光器阵列、会聚光学元件、第一光整形元件以及第二光整形元件，激光器阵列用于产生激光光束阵列；会聚光学元件用于对激光光束阵列进行会聚；第一光整形元件用于使会聚光学元件出射的激光光束阵列在慢轴方向上会聚，以缩小激光光束阵列在会聚点沿慢轴方向上的光斑长度；第二光整形元件用于使第一光整形元件出射的激光光束阵列的发散角度在快轴方向上压缩，并扩大激光光束阵列在会聚点沿快轴方向上的光斑长度。本发明能够使得激光光束阵列在会聚点形成的光斑沿慢轴方向的光斑长度减小，且沿快轴方向上的光斑长度扩大，从而能够降低对光导元件的芯径的要求，进而降低光导元件的成本。
The invention discloses a laser light source. The laser light source comprises a laser array, a condensing optical element, a first light shaping element and a second light shaping element arranged in sequence. The laser array is used for generating a laser beam array; the condensing optical element is used for The laser beam array is condensed; the first light shaping element is used for converging the laser beam array emitted by the converging optical element in the slow axis direction, so as to reduce the spot length of the laser beam array at the convergence point along the slow axis direction; the second light beam The shaping element is used for compressing the divergence angle of the laser beam array emitted by the first light shaping element in the fast axis direction, and expanding the spot length of the laser beam array at the convergence point along the fast axis direction. The invention can reduce the length of the light spot along the slow axis direction of the light spot formed by the laser beam array at the converging point, and expand the light spot length along the direction of the fast axis, thereby reducing the requirement for the core diameter of the light guide element, thereby reducing the light guide element. the cost of.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a laser light source.
Background
As a new light source with high brightness and high collimation, a laser light source is being applied to the fields of projection, illumination, and the like. However, as the requirements for projection and illumination become higher, the requirements for power and quality of the laser light source also become higher.
The inventor of the present application found in long-term research and development that, as shown in fig. 1, a laser beam array generated by a laser element 110 at present is collimated by a collimating lens 120, and then is directly converged by a converging lens 130 and then emitted to a light guide element 140, as shown in fig. 2, since a divergence angle of the collimated laser beam array in a slow axis direction is greater than a divergence angle in a fast axis direction, a length of a light spot formed on the light guide element 140 after being converged in the slow axis direction is greater than a length in the fast axis direction; as shown in fig. 3, since the aperture of the collimated laser beam array is larger in the fast axis direction than in the slow axis direction, the divergence angle of the light spot formed on the light guide element 140 after being converged is larger in the fast axis direction than in the slow axis direction. Since the core diameter and NA (Numerical Aperture) of the light guide element 140 are uniform, the core diameter of the light guide element 140 needs to be larger than the Aperture of the light spot in the slow axis direction, and the NA of the light guide element 140 needs to be larger than the divergence angle of the light spot in the fast axis direction, the cost of the light guide element 140 increases with the increase of the core diameter, and the light guide element is not easily bent.
Disclosure of Invention
The invention provides a laser light source, which aims to solve the technical problem that the requirement on the core diameter of an optical fiber is high in order to improve the laser power in the prior art.
In order to solve the above technical problem, one technical solution adopted by the present invention is to provide a laser light source, including:
the laser array comprises a plurality of laser elements which are arranged in a two-dimensional array, and the fast axis direction and the slow axis direction of the laser elements are the same and are used for generating a collimated laser beam array;
the converging optical element is arranged on the light-emitting side of the laser array and is used for converging the laser beam array;
the first light shaping element is arranged on the light-emitting side of the converging optical element and is used for converging the laser beam array emitted by the converging optical element in the slow axis direction so as to reduce the length of a light spot of the laser beam array at a converging point along the slow axis direction;
and the second light shaping element is arranged on the light outlet side of the first light shaping element and is used for compressing the divergence angle of the laser beam array emitted by the first light shaping element in the fast axis direction and expanding the spot length of the laser beam array at a convergence point along the fast axis direction.
In a specific embodiment, the first light shaping element is further configured to expand the divergence angle of each laser beam in the laser beam array emitted from the converging optical element in the slow axis direction.
In a specific embodiment, the first light-shaping element is a cylindrical lens array, and the cylindrical lens array includes a plurality of cylindrical lenses, each of the cylindrical lenses extends along the fast axis direction and is configured to receive the laser beams generated by a corresponding row of lasers arranged along the fast axis direction.
In one embodiment, the second light-shaping element is a concave cylindrical lens, and the length direction of the concave cylindrical lens is parallel to the slow axis direction.
In a specific embodiment, the laser light source further comprises a third light shaping element disposed between the laser array and the converging optical element for compressing the divergence angle of the laser beams generated by each row of lasers arranged along the fast axis direction in the slow axis direction.
In a specific embodiment, the third light-shaping element is a cylindrical lens array, and the cylindrical lens array includes a plurality of cylindrical lenses, each of the cylindrical lenses extends along the fast axis direction and is configured to receive the laser beams generated by a corresponding row of lasers arranged along the fast axis direction.
In a specific embodiment, the laser light source further includes a fourth light shaping element disposed between the converging optical element and the fourth light shaping element, for compressing the divergence angle of the laser beams generated by each row of lasers arranged along the fast axis direction in the slow axis direction.
In a specific embodiment, the fourth light-shaping element is a cylindrical lens array, and the cylindrical lens array includes a plurality of cylindrical lenses, each of the cylindrical lenses extends along the fast axis direction and is configured to receive the laser beams generated by a corresponding row of lasers arranged along the fast axis direction.
In one embodiment, the geometric centers of the cylindrical lenses are located on a same curve, and the convex surface of the curve faces the converging optical element.
In a specific embodiment, the laser light source further includes a light guide element disposed on the light exit side of the second light shaping element, and configured to guide the laser light beam array emitted from the second light shaping element.
In a specific embodiment, the laser array further includes a plurality of collimating lenses in one-to-one correspondence with the laser elements, and the collimating lenses are configured to perform collimation adjustment on the laser beam array emitted by the plurality of laser elements.
According to the invention, the converging optical element, the first light shaping element and the second light shaping element are arranged on the laser light source to converge and twice light shaping the laser beam array generated by the laser array, so that the length of a light spot formed by the laser beam array emitted to the light guide element at a converging point along the slow axis direction is reduced, and the length of the light spot formed by the laser beam array at the converging point along the fast axis direction is enlarged, thereby reducing the requirement on the core diameter of the light guide element and further reducing the cost of the light guide element.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic diagram of a prior art laser light source;
FIG. 2 is a schematic diagram of a prior art spot formed on a light guide member by a laser light source;
FIG. 3 is a schematic view of the angular distribution of spots formed on a light guide member by a laser light source in the prior art;
FIG. 4 is a schematic view of an embodiment of a laser source along the slow axis;
FIG. 5 is a schematic view of an embodiment of a laser source along the fast axis;
FIG. 6 is a schematic perspective view of a laser device according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a laser element and a collimating lens along a slow axis in an embodiment of a laser source of the present invention;
FIG. 8 is a schematic diagram of a laser element and a collimating lens along the fast axis in an embodiment of a laser light source according to the present invention;
FIG. 9 is a schematic diagram of a converging optical element and a first light shaping element along a slow axis in another embodiment of a laser source according to the present invention;
FIG. 10 is a schematic diagram of a laser beam array emitted from the first optical shaping element forming a spot at a convergence point in an embodiment of the laser light source of the present invention;
FIG. 11 is a schematic view of the angular distribution of the spots formed at the convergence point by the laser beam array emitted from the first optical shaping element in an embodiment of the laser light source of the present invention;
FIG. 12 is a schematic diagram of a laser beam array emitted from the second optical shaping element forming a spot at a convergence point in an embodiment of the laser light source of the present invention;
FIG. 13 is a schematic view of the angular distribution of the spots formed at the convergence point by the laser beam array emitted from the second optical shaping element in an embodiment of the laser light source of the present invention;
FIG. 14 is a schematic view of another embodiment of a laser source of the present invention along the slow axis;
FIG. 15 is a schematic view of another embodiment of a laser source according to the present invention along the fast axis;
FIG. 16 is a schematic view of another embodiment of a laser source of the present invention along the slow axis;
FIG. 17 is a schematic view of another embodiment of a laser source according to the present invention along the fast axis;
FIG. 18 is a schematic view of another embodiment of a laser source of the present invention along the slow axis;
fig. 19 is a schematic structural diagram of another embodiment of the laser light source of the present invention along the fast axis direction.
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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The terms "first" and "second" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. While the term "and/or" is merely one type of association that describes an associated object, it means that there may be three types of relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Referring to fig. 4 and 5, the embodiment of the laser light source of the present invention includes a laser array 200, a converging optical element 300, a first light shaping element 400, and a second light shaping element 500, where the laser array 200 includes a plurality of laser elements 210 arranged in a two-dimensional array, and the fast axis direction and the slow axis direction of the plurality of laser elements 210 are the same and are used for generating a laser beam array 610; the converging optical element 300 is arranged on the light-emitting side of the laser array 200 and is used for converging the laser beam array 610; the first light shaping element 400 is arranged on the light-emitting side of the converging optical element 300 and is used for converging the laser beam array 610 emitted by the converging optical element 300 in the slow axis direction so as to reduce the length of a light spot of the laser beam array 610 at a converging point along the slow axis direction; the second light shaping element 500 is disposed on the light emitting side of the first light shaping element 400, and is configured to compress the divergence angle of the laser beam array 620 emitted by the first light shaping element 400 in the fast axis direction, and expand the spot length of the laser beam array 620 at the convergence point in the fast axis direction.
In the embodiment of the invention, the converging optical element 300, the first light shaping element 400 and the second light shaping element 500 are arranged on the laser light source to converge and twice light-shape the laser beam array 610 generated by the laser array 200, so that the length of a light spot formed by the laser beam array 630 emitted to the light guide element at a converging point along the slow axis direction is reduced, and the length of the light spot formed by the laser beam array 630 at the converging point along the fast axis direction is enlarged, thereby reducing the requirement on the core diameter of the light guide element and further reducing the cost of the light guide element.
In the present embodiment, the first light shaping element 400 is also used to expand the divergence angle of each laser beam in the laser beam array 610 emitted from the converging optical element 300 in the slow axis direction.
In this embodiment, the laser light source further includes a light guide element 700, and the light guide element 700 is disposed on the light exit side of the second light shaping element 500 for guiding the laser beam array 630.
In the present embodiment, the ratio of the divergence angle of each laser beam in the fast axis direction to the divergence angle in the slow axis direction in the laser beam array 630 emitted to the light guide member 700 is greater than or equal to 0.8, for example, 0.8, 0.9, or 1.
In this embodiment, the laser light source further includes a wavelength conversion device (not shown in the figure) disposed on the light-emitting side of the light guide element 700 for performing wavelength conversion on the laser beam array 630.
In the present embodiment, the light guide member 700 is described by taking an optical fiber as an example. In other embodiments, light guiding element 700 may also be an integrating rod or the like.
In this embodiment, the laser array 200 further includes a plurality of collimating lenses 220 corresponding to the laser elements 210 one to one, and the collimating lenses 220 are used for performing collimation adjustment on the laser beam array 610.
Referring also to fig. 6, in the present embodiment, the laser element 210 is a strip-shaped light emitting chip, such as a semiconductor laser chip. The laser element 210 has a light emitting surface 211, the light emitting surface 211 being disposed toward the converging optical element 300, the light emitting surface 211 having a length d1 and the light emitting surface 211 having a width d 2. In the present application, the length direction of the light emitting surface 211 is defined as the slow axis direction of the laser element 210, i.e., the a-axis direction in the drawing; defining the width direction of the light emitting surface 211 as the fast axis direction of the laser element 210, i.e., the b-axis direction in the figure; the light emission direction of the laser element 210, i.e., the c-axis direction in the drawing, is perpendicular to the light emission surface 211 of the laser element 210.
In the present embodiment, the length d1 of the light emitting surface 211 may be greater than or equal to 10 μm, for example 10 μm, 12 μm or 13 μm, and the divergence angle of the light emitting surface 211 in the slow axis direction of the laser element 210 may be 12 ° to 16 °, for example 12 °, 14 ° or 16 °. The width d2 of the light emitting face 211 may be less than or equal to 5 μm, such as 5 μm, 4 μm or 2 μm, and the divergence angle of the light emitting face 211 in the fast axis direction of the laser element 210 may be 43 ° to 47 °, such as 43 °, 45 ° or 47 °. Since the divergence angle of the light emitting surface 211 in the fast axis direction of the laser element 210 is large relative to the divergence angle in the slow axis direction of the laser element 210, the plurality of laser elements 210 are generally arranged with a pitch in the fast axis direction larger than a pitch in the slow axis direction.
Referring to fig. 7 and 8 together, in the present embodiment, the collimating lens 220 may be a biconvex lens. The focal length of the collimating lens 220 is f1, and the collimated laser beam array 610 has a half angle θ of divergence along the slow axis direction of the light emitting member 110, where tan θ is d/f 1.
In other embodiments, the collimating lens 220 may also be a plano-convex lens, which is not limited herein.
In this embodiment, the converging optical element 300 may be a converging lens, such as a biconvex lens. The focal length of the converging optical element 300 is f2, and the length of a spot formed by the converged laser beam array 610 at a converging point along the slow axis direction is L, where L is d × f2/f 1.
In this embodiment, the first light-shaping element 400 is a column of cylindrical lens arrays arranged along the slow axis direction, and the cylindrical lens array includes a plurality of cylindrical lenses, each of which extends along the fast axis direction and is configured to receive the laser beams 610 generated by a corresponding row of lasers arranged along the fast axis direction.
In the present embodiment, the cylindrical lens may be a plano-convex cylindrical lens, a plane of which is disposed facing the condensing optical element 300, and a convex surface of which is disposed facing away from the condensing optical element 300. In other embodiments, the cylindrical lens may also be a biconvex cylindrical lens.
Referring to fig. 9, in other embodiments, the geometric centers of the first light-shaping elements 400 may also be located on the same curve, and the convex surface of the curve faces the converging optical element 300, so that each laser beam 610 can be normally incident on the first light-shaping element 400, and thus each first light-shaping element 400 can achieve a better light-shaping effect. Compared to the first light shaping elements 400 arranged in a straight line, the laser beam passing through the cylindrical lens of the edge region and the laser beam passing through the cylindrical lens of the middle region can achieve a better converging effect.
Referring to fig. 4, 5, 10 and 11, since the length direction of the first light shaping element 400 is parallel to the fast axis direction, the first light shaping element 400 only focuses on the laser beam array 610 along the slow axis direction, so that the total length of the spots formed at the focusing point by the laser beam array 620 emitted from the first light shaping element 400 along the slow axis direction is smaller than the total length of the spots formed at the focusing point by the laser beam array 610 emitted from the focusing optical element 300 along the slow axis direction, which is beneficial to reducing the requirement on the core diameter of the optical fiber and further reducing the cost of the optical fiber.
And according to the principle of conservation of optical expansion: the cross-sectional area of the beam is compressed and its divergence angle necessarily increases. Therefore, the divergence angle of the light spot formed by each laser beam 620 at the convergence point along the slow axis direction can be larger than the divergence angle of the light spot formed by each laser beam 610 at the convergence point along the slow axis direction. Meanwhile, the angle of the total light beam of the laser beam array 620 compared with the laser beam array 610 is not changed, so that the space of the light spots formed by the multi-beam laser beam array 620 at the convergence point in the spatial angle along the slow axis direction is reduced, and the light spots formed by the laser beam array 620 at the convergence point are more uniform.
Referring to fig. 12 and 13 together, in the present embodiment, the second light-shaping element 500 may be a concave cylindrical lens, the length direction of which is parallel to the slow axis direction, for receiving the laser beam array 620.
In this embodiment, the concave cylindrical lens may be a meniscus cylindrical lens, the concave surface of which faces away from the first light-shaping element 400. The length direction of the second light shaping element 500 is parallel to the slow axis direction, and the angular distribution of the laser beam array 620 is adjusted and controlled only in the fast axis direction, so that the total length of the spots formed by the laser beam array 630 at the convergence point in the fast axis direction is greater than the total length of the spots formed by the laser beam array 620 at the convergence point in the fast axis direction, and the divergence angle of the spots formed by each laser beam array 630 at the convergence point in the fast axis direction is smaller than the divergence angle of the spots formed by each laser beam array 620 at the convergence point in the fast axis direction. Therefore, the difference value between the divergence angle of the light spot formed by the laser beam array 630 emitted to the optical fiber at the convergence point along the fast axis direction and the divergence angle along the slow axis direction is smaller than the angle threshold value, the values of the divergence angles are smaller, the difference value between the length of the light spot formed by the laser beam array 630 at the convergence point along the slow axis direction and the length along the fast axis direction is smaller than the length threshold value, the lengths are smaller, the requirements on the core diameter and the NA of the optical fiber are further reduced, and the cost and the setting difficulty of the optical fiber are further reduced.
In other embodiments, the concave cylindrical lens may also be a plano-concave cylindrical lens, which is not limited herein.
Referring to fig. 14 and 15, in another embodiment, the laser light source may further include a third light shaping element 800, and the third light shaping element 800 is disposed between the laser array 200 and the condensing optical element 300, and is used for compressing the divergence angle of the laser beams generated by each row of the lasers 210 arranged in the fast axis direction in the slow axis direction. By arranging the third light shaping element 800, it can be avoided that when the collimated laser beam is emitted to the corresponding first light shaping element 400 through the converging optical element 300 due to an excessively large divergence angle, the collimated laser beam is divergently emitted to the first light shaping element 400 adjacent to the corresponding first light shaping element 400, so that mutual interference is caused, and the emitted light spots are not uniform.
In this embodiment, the third light-shaping element 800 is a cylindrical lens array, and the cylindrical lens array includes a plurality of cylindrical lenses, each of which extends along the fast axis direction and is used for receiving the laser beams generated by a corresponding row of lasers 210 arranged along the fast axis direction.
In the present embodiment, the cylindrical lens may be a plano-convex cylindrical lens, a plane of which is disposed facing the condensing optical element 300, and a convex surface of which is disposed facing away from the condensing optical element 300. In other embodiments, the cylindrical lens may also be a biconvex cylindrical lens.
Referring to fig. 16 and 17, in another embodiment, the laser light source may further include a fourth light shaping element 900, and the fourth light shaping element 900 is disposed between the converging optical element 300 and the first light shaping element 400, and is used for compressing the divergence angle of the laser beams generated by each row of the lasers 210 arranged in the fast axis direction in the slow axis direction. By arranging the fourth light shaping element 900, it can be avoided that when the collimated laser beam is emitted to the corresponding first light shaping element 400 through the converging optical element 300 due to an excessively large divergence angle, the collimated laser beam is divergently emitted to the first light shaping element 400 adjacent to the corresponding first light shaping element 400, so that mutual interference is caused, and the emitted light spots are not uniform.
In this embodiment, the fourth light-shaping element 900 is a cylindrical lens array, and the cylindrical lens array includes a plurality of cylindrical lenses, each of which extends along the fast axis direction and is used for receiving the laser beams generated by a corresponding row of lasers 210 arranged along the fast axis direction.
In the present embodiment, the cylindrical lens may be a plano-convex cylindrical lens, a plane of which is disposed opposite to the condensing optical element 300, and a convex surface of which is disposed opposite to the condensing optical element 300. In other embodiments, the cylindrical lens may also be a biconvex cylindrical lens.
In this embodiment, the focal point of the fourth light shaping element 900 may be located between the fourth light shaping element 900 and the first light shaping element 400, or may be located at the exit end of the first light shaping element 400, that is, the first light shaping element 400 is located at the non-focal position of the fourth light shaping element 900.
Referring to fig. 18 and fig. 19, in another specific embodiment, the laser light source may further include a third light shaping element 800 and a fourth light shaping element 900 at the same time, where the structures and positions of the third light shaping element 800 and the fourth light shaping element 900 are referred to the above laser light source embodiment and are not described herein again. By arranging the third light shaping element 800 and the fourth light shaping element 900 at the same time, the size of the divergence angle of the laser beam can be better controlled, and the mutual interference can be further reduced.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (11)
1. A laser light source, comprising:
the laser array comprises a plurality of laser elements which are arranged in a two-dimensional array, and the fast axis direction and the slow axis direction of the laser elements are the same and are used for generating a laser beam array;
the converging optical element is arranged on the light-emitting side of the laser array and is used for converging the laser beam array;
the first light shaping element is arranged on the light-emitting side of the converging optical element and is used for converging the laser beam array emitted by the converging optical element in the slow axis direction so as to reduce the length of a light spot of the laser beam array at a converging point along the slow axis direction;
and the second light shaping element is arranged on the light outlet side of the first light shaping element and is used for compressing the divergence angle of the laser beam array emitted by the first light shaping element in the fast axis direction and expanding the spot length of the laser beam array at a convergence point along the fast axis direction.
2. The laser light source of claim 1, wherein the first light shaping element is further configured to expand the divergence angle of each laser beam in the array of laser beams emitted from the converging optical element in the slow axis direction.
3. The laser light source of claim 1, wherein the first light shaping element is a cylindrical lens array, the cylindrical lens array including a plurality of cylindrical lenses, each cylindrical lens extending along the fast axis direction for receiving the laser beams generated by a corresponding row of lasers arranged along the fast axis direction.
4. The laser light source of claim 1, wherein the second light shaping element is a concave cylindrical lens, and the length direction of the concave cylindrical lens is parallel to the slow axis direction.
5. The laser light source of claim 1, further comprising a third light shaping element disposed between the laser array and the converging optical element for compressing divergence angles of laser beams generated by each row of lasers aligned along the fast axis direction in the slow axis direction.
6. The laser light source of claim 5, wherein the third light shaping element is a cylindrical lens array, the cylindrical lens array comprising a plurality of cylindrical lenses, each cylindrical lens extending along the fast axis direction for receiving the laser beams generated by a corresponding row of lasers arranged along the fast axis direction.
7. The laser light source of claim 1 or 5, further comprising a fourth light shaping element disposed between the converging optical element and the first light shaping element for compressing the divergence angle of the laser beams generated by each row of lasers aligned along the fast axis direction in the slow axis direction.
8. The laser light source of claim 7, wherein the fourth light shaping element is a cylindrical lens array, the cylindrical lens array including a plurality of cylindrical lenses, each cylindrical lens extending along the fast axis direction for receiving the laser beams generated by a corresponding row of lasers arranged along the fast axis direction.
9. The laser light source of claim 3, wherein the geometric centers of the plurality of cylindrical lenses are located on a same curve, and the convex surface of the curve faces the converging optical element.
10. The laser light source of claim 1, further comprising a light guide element disposed on the light exit side of the second light shaping element for guiding the laser beam array emitted from the second light shaping element.
11. The laser light source of claim 1, wherein the laser array further comprises a plurality of collimating lenses corresponding to the laser elements one to one, and the collimating lenses are configured to perform collimation adjustment on the laser beam array emitted by the plurality of laser elements.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010307318.XA CN113534586A (en) | 2020-04-17 | 2020-04-17 | Laser light source |
| PCT/CN2021/087441 WO2021208996A1 (en) | 2020-04-17 | 2021-04-15 | Laser light source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010307318.XA CN113534586A (en) | 2020-04-17 | 2020-04-17 | Laser light source |
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| CN114660820B (en) * | 2022-03-15 | 2024-04-16 | 中国电子科技集团公司第十三研究所 | Large-view-field multi-Bar integrated laser emission structure |
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| WO2021208996A1 (en) | 2021-10-21 |
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