A laser shaping module, a projection light source system and a projection device

Abstract

The application discloses a laser shaping module, a projection light source system and a projection device, wherein the laser shaping module comprises a laser device for outputting a laser beam, and the laser beam has different divergence characteristics in a fast axis direction and a slow axis direction; a spherical lens is arranged on the light output side of the laser device; a cylindrical lens module is arranged on the light output side of the spherical lens; the cylindrical lens module has opposite first and second working surfaces along the propagation direction of the laser beam; the cylindrical axis of the first working surface is parallel to the fast axis direction and is used for shaping the laser beam in the slow axis direction; the cylindrical axis of the second working surface is parallel to the slow axis direction and is used for shaping the laser beam in the fast axis direction; and a pump light source is used for receiving the shaped laser beam and is pumped and excited under the action of the laser beam. The application compensates for the difference between the divergence characteristics of the laser beam in the slow axis direction and the fast axis direction by arranging the cylindrical lens module, thereby improving the quality of the pump beam and the pumping efficiency.

Description

Technical Field

[0001] This invention relates to the field of optoelectronic device technology, and in particular to a laser shaping module, a projection light source system, and a projection device. Background Technology

[0002] In existing projection light source systems, light-emitting diodes (LEDs) can be used as illumination or pump sources to achieve primary color illumination output or to excite fluorescent materials to generate a specified light beam. This type of solution is widely used in various projection devices due to its mature structure, controllable cost, and convenient assembly and adjustment. However, as projection devices rapidly develop towards higher brightness, higher luminous efficiency, and miniaturization, some solutions require replacing the original LED pumping path with a laser pumping path to improve energy density, enhance directional control capabilities, and improve the coupling conditions of subsequent optical links.

[0003] However, the emitted beams of laser light sources (especially laser diode light sources) exhibit different divergence characteristics in the fast and slow axis directions. Directly applying existing optical paths suitable for LEDs can easily lead to irregular beam patterns and insufficient matching of the stimulated region on the phosphor layer of the pump source, thereby reducing pump efficiency and affecting the beam output efficiency of the pump source and the overall light energy utilization of the projection light source system, ultimately impacting the final quality of the pump light. Furthermore, conventional lens groups or single-direction shaping elements cannot simultaneously meet the differentiated shaping requirements of the fast and slow axis directions, failing to achieve precise laser beam shaping and thus hindering the development of high-performance projection equipment. Therefore, there is an urgent need to design a laser shaping module, and a projection light source system and projection equipment equipped with this laser shaping module. Summary of the Invention

[0004] The purpose of this invention is to provide a laser shaping module, a projection light source system, and a projection device to solve the problem that the output beam of existing laser light sources has different divergence characteristics in the fast axis and slow axis directions, resulting in low pump light efficiency and insufficient pump light quality.

[0005] To achieve this objective, the present invention adopts the following technical solution: A laser shaping module, comprising: A laser for outputting a laser beam, wherein the laser beam has different divergence characteristics in the fast axis direction and the slow axis direction; A spherical lens, disposed on the light-emitting side of the laser, is used to perform at least one of the following on the laser beam: pre-stage focusing, collimation adjustment, beam compression, and angular distribution redistribution; A cylindrical lens module is disposed on the light-emitting side of the spherical lens; along the laser beam propagation direction, the cylindrical lens module has a first working surface and a second working surface opposite to each other; the cylindrical axis of the first working surface is parallel to the fast axis direction and is used to shape the laser beam in the slow axis direction; the cylindrical axis of the second working surface is parallel to the slow axis direction and is used to shape the laser beam in the fast axis direction. A pump source is used to receive the shaped laser beam and be pumped and excited by the laser beam.

[0006] Furthermore, both the first working surface and the second working surface are recessed inward to expand and shape the laser beams in the slow axis direction and the fast axis direction, respectively. The radius of curvature of the first working surface is smaller than the radius of curvature of the second working surface; The extension dimension of the first working surface in its column axis direction is smaller than the extension dimension of the second working surface in its column axis direction.

[0007] Furthermore, the cylindrical lens module adopts an integrated structure or a separate structure; When the cylindrical lens module adopts a split structure, the cylindrical lens module includes at least two cylindrical lenses, with the first working surface and the second working surface respectively disposed on different cylindrical lenses, so as to independently shape the laser beam in the slow axis direction and the fast axis direction; The pump source includes a light-emitting body and a fluorescent layer disposed on the surface of the light-emitting body; the fluorescent layer is disposed on the side facing the laser beam and is pumped and excited by the laser beam.

[0008] Furthermore, it also includes: The first light guide element is disposed between the light-emitting side of the cylindrical lens module and the pump light source, and is used to guide the shaped laser beam to the pump light source. A first shaping lens module is disposed between a first light guide element and a pump light source, and at least one optical surface of the first shaping lens module protrudes. in, The main optical axis of the first shaping lens module is perpendicular to the main optical axis of the cylindrical lens module, and the two main optical axes intersect to form the first perpendicular foot position; The first light guide element is located at the first vertical foot position, and the first light guide element is arranged at a 45° angle relative to the main optical axis of the first shaping lens module and the main optical axis of the cylindrical lens module. The first light guide element is a dichroic mirror.

[0009] Furthermore, the first shaping lens module includes a first shaping lens and a second shaping lens having the same principal optical axis. The first shaping lens is arranged close to the pump light source, and the second shaping lens is arranged close to the first light guide element. The area of ​​the protruding optical surface on the first shaping lens is smaller than the area of ​​the protruding optical surface on the second shaping lens; The radius of curvature of the protruding optical surface on the first shaping lens is smaller than the radius of curvature of the protruding optical surface on the second shaping lens.

[0010] A projection light source system includes the laser shaping module and also includes a uniform light shaping module; The homogenizing and shaping module is used to homogenize and shape the pump excitation beam output by the laser shaping module.

[0011] Furthermore, the beam homogenizing and shaping module includes a beam homogenizing mirror and a first convex lens arranged sequentially along the propagation direction of the pump excitation beam; The uniform light shaping module is located on the side of the first light guide element away from the pump light source.

[0012] Furthermore, a third convex lens, a second light guide element, a first light source, and a second light source are provided on the side of the first light guide element away from the cylindrical lens module; The light output axes of the third convex lens and the first light source are both collinear with the light output axis of the cylindrical lens module, and the third convex lens and the first light source are located on opposite sides of the second light guide element, wherein the third convex lens is arranged on the side closer to the first light guide element. The light-emitting axis of the second light source is perpendicular to the light-emitting axis of the third convex lens, and the two principal optical axes intersect to form the second perpendicular foot position; The second light guide element is disposed at the second vertical position, and the second light guide element is arranged at a 45° angle relative to the light output axis of the second light source and the light output axis of the third convex lens. The second light guide element is a dichroic mirror.

[0013] Furthermore, a second shaping lens module is provided between the first light source and the second light guide element, and the light output axis of the second shaping lens module is collinear with the light output axis of the first light source; A third shaping lens module is provided between the second light source and the second light guide element, wherein the light output axis of the third shaping lens module is collinear with the light output axis of the second light source; Both the second and third shaping lens modules have at least one optical surface that protrudes. The colors of the pump light source, the first light source, and the second light source are not exactly the same.

[0014] A projection device includes the aforementioned projection light source system, and further includes a prism, a digital micromirror device, and a projection lens; The digital micromirror device is used to image and modulate the beam after it has been homogenized and shaped by the homogenizing and shaping module, and to reflect and output the image beam. The projection lens is used to focus and shape the imaging beam and project the image outward; The prism is positioned between the uniform light shaping module, the digital micromirror device, and the projection lens. It is used to refract and guide the light beam emitted from the uniform light shaping module to the digital micromirror device, and to refract and transmit the imaging light beam modulated by the digital micromirror device to the projection lens. The uniform light shaping module also includes a second convex lens disposed on the light-emitting side of the first convex lens, wherein the light-emitting axis of the second convex lens is perpendicular to the corresponding incident surface on the prism.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The laser shaping module provided by this invention uses a cylindrical lens module with a first working surface and a second working surface to shape the laser beam in the slow axis and fast axis directions. This compensates for the difference in the divergence characteristics of the laser beam in the slow axis and fast axis directions, balances the propagation divergence rate of the laser beam in the two orthogonal directions, reduces beam astigmatism, and significantly improves the beam quality and collimation of the laser beam. This allows the shaped laser beam to be more optimally incident on the pump source. After absorbing the energy of the laser beam, the pump source completes energy level transitions, achieving stable pump excitation, thereby effectively improving the additional pump efficiency and ensuring that the pump source outputs a pump excitation beam with high-quality optical characteristics. At the same time, a spherical lens performs pre-stage focusing, collimation adjustment, beam compression, and / or angle distribution redistribution on the laser beam, regulating the basic shape of the laser beam, improving the shaping accuracy and working stability of the cylindrical lens module, compressing the divergence angle of the laser beam, improving the stimulated matching relationship between the laser beam and the pump source, reducing energy loss during the pumping process, and improving the quality of the pump beam. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0018] Figure 1 This is a schematic diagram of the laser shaping module in this invention; Figure 2 This is a schematic diagram of the laser, spherical lens, and cylindrical lens module in this invention; Figure 3 This is a schematic diagram of the pump light source and the first shaping lens module in this invention; Figure 4 This is a three-dimensional schematic diagram of the central cylindrical lens module of the present invention. Figure 1 ,in Figure 4 The central lens module adopts an integrated structure; Figure 5 This is a three-dimensional schematic diagram of the central cylindrical lens module of the present invention. Figure 2 ,in Figure 5 perspective and Figure 4 Different perspectives; Figure 6 This is a three-dimensional schematic diagram of the central cylindrical lens module of the present invention. Figure 1 ,in Figure 6 The central lens module adopts a separate structure; Figure 7 This is a three-dimensional schematic diagram of the central cylindrical lens module of the present invention. Figure 2 ,in Figure 7 perspective and Figure 6 Different perspectives; Figure 8 This is a schematic diagram of the projection light source system in this invention; Figure 9 This is a schematic diagram of the projection device in this invention; Figure 10 This is a three-dimensional view of the projection device in this invention.

[0019] Illustration: 1. Laser; 2. Spherical lens; 3. Cylindrical lens module; 31. First working surface; 32. Second working surface; 33. First cylindrical lens; 34. Second cylindrical lens; 4. First light guide element; 5. Pump light source; 51. Light-emitting body; 52. Fluorescent layer; 6. First shaping lens module; 61. First shaping lens; 62. Second shaping lens; 7. Beam homogenizing and shaping module; 71. Beam homogenizing mirror; 72. First convex lens; 73. Second convex lens; 81. First light source; 82. Second light source; 83. Third convex lens; 84. Second light guide element; 85. Second shaping lens module; 86. Third shaping lens module; 91. Prism; 92. Digital micromirror device; 93. Projection lens. Detailed Implementation

[0020] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0021] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1: This embodiment provides a laser shaping module that can specifically shape laser beams with different divergence characteristics in the fast and slow axis directions, ensuring pumping efficiency and quality. Combined with... Figures 1-7As shown, the laser shaping module includes a laser 1, a spherical lens 2, a cylindrical lens module 3, and a pump source 5. The laser 1 is used to output a laser beam, and the laser beam has different divergence characteristics in the fast axis direction and the slow axis direction, exhibiting an asymmetric beam divergence state between the fast and slow axes; in a specific embodiment, the divergence angle of the laser beam in the fast axis direction is greater than the divergence angle in the slow axis direction. The spherical lens 2 is disposed on the light-emitting side of the laser 1 and is used to perform at least one of the following functions on the laser beam: pre-focusing, collimation adjustment, beam compression, and angle distribution redistribution. On the one hand, it pre-regulates the basic shape of the laser beam, enabling the cylindrical lens module 3 to more accurately target and shape the fast and slow axes of the laser beam, avoiding deviations in cylindrical lens shaping caused by the original beam divergence and improving the shaping accuracy and operational stability of the cylindrical lens module 3. On the other hand, it can improve the stimulated matching relationship between the laser beam and the pump source 5. By compressing the laser beam divergence angle, the laser beam can act more concentratedly on the pump source 5, reducing pump energy loss and thus improving the additional pump efficiency. It should be noted that the functions of pre-focusing, collimation adjustment, beam compression, and angle distribution redistribution implemented by the spherical lens 2 can be flexibly set by those skilled in the art according to actual laser shaping needs, and this embodiment does not impose any limitations. The cylindrical lens module 3 is disposed on the light-emitting side of the spherical lens 2; along the laser beam propagation direction, combined with Figures 4-7 As shown, the cylindrical lens module 3 has a first working surface 31 and a second working surface 32. In a specific embodiment, the first working surface 31 and the second working surface 32 serve as the light-incident surface and the light-outceasing surface of the cylindrical lens module 3. The first working surface 31 and the second working surface 32 are orthogonally arranged. The cylindrical axis of the first working surface 31 is parallel to the fast axis direction and is used to shape the laser beam in the slow axis direction. The cylindrical axis of the second working surface 32 is parallel to the slow axis direction and is used to shape the laser beam in the fast axis direction, compensate for the difference in the divergence characteristics of the laser beam in the slow axis direction and the fast axis direction, and make the divergence law and spot shape of the laser beam in the slow axis direction and the fast axis direction more consistent. The original elliptical spot is corrected into a near-circular spot, balancing the propagation divergence rate of the laser beam in the two orthogonal directions, reducing beam astigmatism, and improving the beam quality and collimation of the laser beam. Pump source 5 is used to receive the shaped laser beam and is pumped and excited under the action of the laser beam, and finally outputs the pump-excited beam. It relies on the incident shaped laser beam to complete energy absorption and energy level transition, realize the conversion output of a specific light source, and ensure that the output beam has high-quality optical characteristics.

[0024] In specific implementation, when laser 1 is working, it outputs a laser beam, and the output laser beam exhibits different divergence characteristics in the fast axis direction and slow axis direction. Subsequently, the laser beam is directed towards spherical lens 2, which performs pre-convergence focusing, collimation adjustment, beam compression, and / or angle redistribution on the laser beam, thus regulating the basic shape of the laser beam. This allows cylindrical lens module 3 to more accurately and specifically shape the laser beam in the fast axis and slow axis directions, avoiding deviations in cylindrical lens shaping caused by the original beam divergence and improving the shaping accuracy and operational stability of cylindrical lens module 3. At the same time, by compressing the divergence angle of the laser beam, the stimulated matching relationship between the laser beam and the pump source 5 is improved, allowing the laser beam to act more concentratedly on the pump source 5, reducing the pumping process. The energy loss in the process is reduced; then, the laser beam enters the cylindrical lens module 3, which uses the first working surface 31 and the second working surface 32 to shape the laser beam in the slow axis direction and the fast axis direction, compensate for the difference in the divergence characteristics of the laser beam in the slow axis direction and the fast axis direction, correct the original elliptical spot into a near-circular spot, balance the propagation divergence rate of the laser beam in the two orthogonal directions, reduce beam astigmatism, and significantly improve the beam quality and collimation of the laser beam; finally, the shaped laser beam is incident on the pump source 5, which receives the shaped laser beam, absorbs the energy of the laser beam and completes the energy level transition, and is pumped and excited under the action of the laser beam, and finally outputs a pump-excited beam with high-quality optical characteristics, effectively improving the additional pump efficiency.

[0025] Combination Figures 4-7As shown, both the first working surface 31 and the second working surface 32 are recessed inward to expand and shape the laser beams in the slow-axis and fast-axis directions, respectively. Utilizing the refractive properties of the recessed surfaces, the laser beams are directionally expanded and their angles corrected. In a specific embodiment, the radius of curvature of the first working surface 31 is smaller than that of the second working surface 32. Since the divergence angle of the laser beam in the fast-axis direction is greater than that in the slow-axis direction, the second working surface 32 needs a larger radius of curvature to achieve sufficient beam expansion and divergence correction for the laser beam in the fast-axis direction. The first working surface 31, with its smaller radius of curvature, precisely matches the divergence characteristics of the laser beam in the slow-axis direction. Through this differentiated curvature design, the beam shaping effect in the fast-axis and slow-axis directions is ensured to be consistent, resulting in a final output laser beam spot shape that is closer to an ideal circle. The extension dimension of the first working surface 31 in its cylindrical axis direction is smaller than that of the second working surface 32 in its cylindrical axis direction. This difference in size matches the divergence range of the laser beam in the fast and slow axis directions. The smaller extension dimension of the first working surface 31 in the cylindrical axis direction can accurately cover the propagation range of the laser beam in the slow axis direction, avoiding beam waste. The larger extension dimension of the second working surface 32 in the cylindrical axis direction can fully accommodate the laser beam in the fast axis direction with a larger divergence angle, ensuring that the laser beam in the fast axis direction is fully shaped, further improving the shaping efficiency and effect of the cylindrical lens module 3. In a specific embodiment, combined with Figures 4-5 As shown, the cylindrical lens module 3 adopts an integrated structure, meaning it is a single piece of cylindrical lens. This integrated structure reduces optical path offset and energy loss caused by splicing multiple components, improves the structural stability and optical path consistency of the cylindrical lens module 3, and makes the structure more compact, reducing manufacturing costs. In this case, the first working surface 31 and the second working surface 32 serve as the light-incident and light-exit surfaces of the single cylindrical lens, enabling continuous shaping of the laser beam and simplifying the overall assembly process. The pump source 5 includes a light-emitting body 51 and a fluorescent layer 52 disposed on the surface of the light-emitting body 51. The fluorescent layer 52 is disposed on the side facing the laser beam and is pumped and excited by the laser beam to form a pump-excited beam. The fluorescent layer 52 can absorb the energy of the laser beam after being shaped by the spherical lens 2 and the cylindrical lens module 3, undergoing energy level transitions and releasing fluorescence of a specified color, thereby forming a stable pump-excited beam. In a specific embodiment, the pump source 5 is a green light source.

[0026] The laser shaping module described in this embodiment further includes a first light guide element 4 and a first shaping lens module 6. The first light guide element 4 is disposed between the light-emitting side of the cylindrical lens module 3 and the pump source 5, and is used to guide the shaped laser beam to the pump source 5; changing the propagation direction of the laser beam so that the laser beam shaped by the cylindrical lens module 3 can be transmitted along a preset optical path to the first shaping lens module 6 and the pump source 5. The first shaping lens module 6 is disposed between the first light guide element 4 and the pump source 5. At least one optical surface of the first shaping lens module 6 is convex. Utilizing the converging and collimating characteristics of the convex optical surface, the laser beam guided by the first light guide element 4 is reshaped a second time, further compressing the divergence angle of the laser beam, homogenizing the cross-sectional energy distribution of the laser beam, and enabling the laser beam to be incident on the pump source 5 in a more optimized form, thereby improving the efficiency and stability of pump excitation. In this configuration, the principal optical axis of the first shaping lens module 6 is perpendicular to the principal optical axis of the cylindrical lens module 3, and their principal optical axes intersect to form a first perpendicular foot position. The first light guide element 4 is located at the first perpendicular foot position, and the first light guide element 4 is arranged at a 45° angle relative to both the principal optical axis of the first shaping lens module 6 and the principal optical axis of the cylindrical lens module 3. This 45° angle allows the laser beam output from the cylindrical lens module 3 to be incident on the surface of the first light guide element 4. After being reflected by the first light guide element 4, the laser beam is guided to the first shaping lens module 6 at an angle perpendicular to the original propagation direction, achieving a 90° deflection of the laser beam. The first light guide element 4 is a dichroic mirror, which has specific spectral selectivity and can reflect the laser beam shaped by the cylindrical lens module 3, allowing it to be smoothly guided to the first shaping lens module 6, while allowing the pump excitation beam generated by the pump light source 5 to penetrate.

[0027] In specific implementation, the laser beam shaped by the cylindrical lens module 3 propagates along the main optical axis of the cylindrical lens module 3 until it reaches the first light guide element 4 located at the first perpendicular position. The first light guide element 4, acting as a dichroic mirror, reflects the laser beam by virtue of its own spectral selectivity, causing the laser beam to turn 90° and be guided along the main optical axis of the first shaping lens module 6. The first shaping lens module 6 utilizes the converging and collimating characteristics of its optical surface protruding on at least one side to perform secondary shaping on the laser beam after the turn, further compressing the divergence angle of the laser beam and homogenizing the cross-sectional energy distribution of the laser beam, so that the laser beam can be incident on the pump source 5 in a better form. Under the action of the laser beam, the pump source 5 completes pump excitation and generates a pump excitation beam, at which time the dichroic mirror allows the pump excitation beam to pass through. The entire implementation process ensured the stable transmission and shaping of the laser beam through a reasonable optical path layout and the coordinated work of various components. This effectively improved the pumping excitation efficiency and stability of the pump source 5, while ensuring the smooth output of the pump excitation beam, enabling the entire laser shaping module to operate stably and efficiently.

[0028] The first shaping lens module 6 includes a first shaping lens 61 and a second shaping lens 62 with the same principal optical axis. The first shaping lens 61 is arranged close to the pump light source 5, and the second shaping lens 62 is arranged close to the first light guide element 4. The first shaping lens 61 and the second shaping lens 62 work together to perform graded shaping of the laser beam. The second shaping lens 62 first initially converges and collimates the laser beam, and the first shaping lens 61 then performs fine shaping to ensure that the laser beam is incident on the pump light source 5 in a better state, thereby improving the shaping effect and the pumping effect. In a specific embodiment, the area of ​​the protruding optical surface on the first shaping lens 61 is smaller than the area of ​​the protruding optical surface on the second shaping lens 62, in order to adapt to the propagation and shaping law of the laser beam. The second shaping lens 62 is close to the first light guide element 4 and needs to receive the laser beam after it has been deflected. The larger area of ​​the protruding optical surface can fully cover the propagation range of the laser beam and reduce beam loss. The first shaping lens 61 is close to the pump source 5. At this time, the laser beam has been initially compressed by the second shaping lens 62. The smaller area of ​​the protruding optical surface can achieve precise focusing of the laser beam, further compressing the beam divergence angle, so that the laser beam can accurately act on the phosphor layer 52 of the pump source 5 and improve the energy utilization rate. The radius of curvature of the protruding optical surface on the first shaping lens 61 is smaller than that on the protruding optical surface on the second shaping lens 62. The second shaping lens 62 is used to initially converge and collimate the laser beam after it has been turned. The larger radius of curvature can achieve gentle convergence, avoiding excessive beam convergence that could lead to uneven energy concentration, while also regulating the beam shape. The first shaping lens 61 is used to finely converge the laser beam. The smaller radius of curvature can provide stronger converging ability, further compressing the divergence angle of the laser beam, so that the laser beam forms a precise and concentrated spot that is incident on the pump source 5, thereby improving the pump excitation efficiency and the accuracy of the beam action.

[0029] The laser shaping module provided in this embodiment uses a cylindrical lens module 3 with a first working surface 31 and a second working surface 32 to shape the laser beam in the slow axis and fast axis directions. This compensates for the difference in the divergence characteristics of the laser beam in the slow axis and fast axis directions, balances the propagation divergence rate of the laser beam in the two orthogonal directions, reduces beam astigmatism, and significantly improves the beam quality and collimation of the laser beam. This allows the shaped laser beam to be more optimally incident on the pump source 5. After absorbing the energy of the laser beam, the pump source 5 completes energy level transitions, achieving stable pump excitation, thereby effectively improving the additional pump efficiency and ensuring that the pump source 5 outputs a pump excitation beam with high-quality optical characteristics. At the same time, the spherical lens 2 performs pre-stage focusing, collimation adjustment, beam compression, and / or angle distribution redistribution on the laser beam, regularizing the basic shape of the laser beam, improving the shaping accuracy and working stability of the cylindrical lens module 3, and compressing the divergence angle of the laser beam. This improves the stimulated matching relationship between the laser beam and the pump source 5, reduces energy loss during the pumping process, and improves the quality of the pump beam.

[0030] Example 2: This embodiment provides a laser shaping module that can specifically shape laser beams with different divergence characteristics in the fast and slow axis directions, and is adaptable to scenarios where the shaping effect needs to be flexibly adjusted according to actual pumping requirements. Combined with... Figures 6-7 As shown, the difference between this embodiment and Embodiment 1 is that the cylindrical lens module 3 in this embodiment adopts a split structure; furthermore, the cylindrical lens module 3 includes at least two cylindrical lenses, with the first working surface 31 and the second working surface 32 respectively disposed on different cylindrical lenses, so as to independently shape the laser beams in the slow axis direction and the fast axis direction. In a specific embodiment, the cylindrical lens module 3 includes a first cylindrical lens 33 and a second cylindrical lens 34. The first working surface 31 is disposed on the first cylindrical lens 33 and is the light-incident surface of the first cylindrical lens 33. The second working surface 32 is disposed on the second cylindrical lens 34 and is the light-outcrystal surface of the second cylindrical lens 34, so as to realize the independent shaping of the laser beam in the slow axis direction and the laser beam in the fast axis direction. At the same time, the position and angle of the first cylindrical lens 33 and the second cylindrical lens 34 can be adjusted separately, flexibly adapting to laser beams with different divergence parameters, accurately compensating for the difference in divergence characteristics of the laser beam in the fast and slow axis directions, and improving the adaptability and correction accuracy of beam shaping.

[0031] In practical implementation, the first working surface 31 and the second working surface 32 on the cylindrical lens module 3 can separately shape the laser beam in the slow axis direction and the fast axis direction, respectively, to compensate for the divergence differences in the slow axis direction and the fast axis direction. During use, the position and angle of the first cylindrical lens 33 and the second cylindrical lens 34 can be adjusted individually to flexibly adapt to laser beams with different fast axis and slow axis divergence parameters, improve the correction accuracy of beam shaping, and avoid the problem that the integrated cylindrical lens module 3 cannot independently adjust the first working surface 31 / second working surface 32. It can be applied to scenarios that require flexible adjustment of the shaping effect according to actual pumping needs, such as precision laser pumping, precision laser display, optical inspection and other fields.

[0032] Example 3: This embodiment provides a projection light source system for achieving beam homogenization and shaping, facilitating subsequent projection. Combined with... Figure 8 As shown, the projection light source system described in this embodiment includes the laser shaping module described in Embodiment 1 or Embodiment 2, and further includes a uniform beam shaping module 7. The uniform beam shaping module 7 is used to uniformly shape and shape the pump excitation beam output by the laser shaping module. The uniform beam shaping module 7 further regulates the spot shape and propagation direction of the pump excitation beam, making the pump excitation beam form a uniform, collimated parallel beam, adapting to the projection requirements of the projection light source system, improving the brightness uniformity and clarity of the projected image, avoiding local bright spots or dark areas, and ensuring that the projection light source system outputs a uniform projection beam. The uniform beam shaping module 7 includes a uniform mirror 71 and a first convex lens 72 arranged sequentially along the propagation direction of the pump excitation beam. The homogenizing and shaping module 7 is located on the side of the first light guide element 4 away from the pump light source 5. The homogenizing and shaping module 7 can avoid the propagation path of the laser beam output by the laser 1, thus avoiding interference with the normal propagation of the laser beam. At the same time, it can receive the pump excitation beam that passes through the first light guide element 4 and homogenize and shape the pump excitation beam to meet the subsequent use requirements of the projection light source system.

[0033] A third convex lens 83, a second light guide element 84, a first light source 81, and a second light source 82 are provided on the side of the first light guide element 4 away from the cylindrical lens module 3. The light output axes of the third convex lens 83 and the first light source 81 are collinear with the light output axis of the cylindrical lens module 3, and the third convex lens 83 and the first light source 81 are located on opposite sides of the second light guide element 84, with the third convex lens 83 positioned closer to the first light guide element 4. The light output axis of the second light source 82 is perpendicular to the light output axis of the third convex lens 83, and their principal optical axes intersect to form a second perpendicular foot position. The second light guide element 84 is positioned at a second vertical position, and is arranged at a 45° angle to both the output axis of the second light source 82 and the output axis of the third convex lens 83. This allows the light beam transmitted through the third convex lens 83 and the light beam output from the second light source 82 to both be incident on the surface of the second light guide element 84. After reflection or penetration, they are transmitted along the same path. The light beam is then reflected by the first light guide element 4 and transmitted along the same path as the pump excitation beam, thus completing the synthesis of the three beams. The second light guide element 84 is a dichroic mirror with specific spectral selectivity, capable of reflecting the light beam output from the second light source 82 and penetrating the light beam from the first light source 81, enabling the simultaneous transmission of the two beams output from the first and second light sources 81. The pump light source 5, the first light source 81, and the second light source 82 are not identical in color, used to achieve multi-color light beam combining and expand the color gamut of the projection light source system. In a specific embodiment, the first light source 81 and the second light source 82 are independent light sources that do not require external laser beam pumping and can emit light autonomously simply by being powered on. In this embodiment, they are used to cooperate with the monochromatic light output by the pump light source 5 to form a multicolor beam through optical path beam combining, thereby improving the color richness and overall brightness of the projected image. Furthermore, the pump light source 5, the first light source 81, and the second light source 82 are all different colors; in this embodiment, the pump light source 5 is a green light source, and the first light source 81 and the second light source 82 are red and blue light sources, respectively, that is, the three output red, green, and blue primary colors of light. By flexibly adjusting the ratio of the three primary colors of light, the color of the subsequent projected image can be calibrated to meet the requirements of high-quality color projection.

[0034] A second shaping lens module 85 is provided between the first light-emitting source 81 and the second light guide element 84. The light output axis of the second shaping lens module 85 is collinear with the light output axis of the first light-emitting source 81, and it is used to shape the light beam emitted by the first light-emitting source 81. A third shaping lens module 86 is provided between the second light-emitting source 82 and the second light guide element 84. The light output axis of the third shaping lens module 86 is collinear with the light output axis of the second light-emitting source 82, and it is used to shape the light beam emitted by the second light-emitting source 82. Both the second shaping lens module 85 and the third shaping lens module 86 have at least one convex optical surface. Utilizing the converging and collimating characteristics of the convex optical surface, the beam divergence angle is compressed, and the beam shape is regulated, allowing the two beams to be incident on the second light guide element 84 in a more optimal state. This avoids problems such as excessive stray light after beam merging due to excessive beam divergence. In a specific embodiment, both the second shaping lens module 85 and the third shaping lens module 86 include at least one shaping lens. When the number of shaping lenses on the second shaping lens module 85 and / or the third shaping lens module 86 is greater than or equal to 2, the different shaping lenses on the second shaping lens module 85 and / or the third shaping lens module 86 have the same principal optical axis. Through the coordinated cooperation of multiple shaping lenses, graded fine shaping is achieved to adapt to the beam shaping requirements of different divergence parameters.

[0035] In practice, the pump-excitation beam output from the laser shaping module is homogenized and shaped by the homogenizing and shaping module 7 to even out the energy distribution across the beam cross-section. The beams emitted by the first light source 81 and the second light source 82 are transmitted along the same path after being penetrated and reflected by the second light guide element 84, and then reflected by the first light guide element 4 before being transmitted along the same path as the pump-excitation beam, thus combining the three beams. Finally, they are homogenized and shaped together by the homogenizing and shaping module 7. During this process, the colors of the pump light source 5, the first light source 81, and the second light source 82 are not entirely the same, enabling multi-color beam combining and expanding the color gamut of the projection light source system to better meet the needs of high-quality color projection.

[0036] The projection light source system provided in this embodiment homogenizes and shapes the light beam through the homogenizing and shaping module 7, thereby homogenizing the energy distribution of the beam cross section and meeting the optical requirements of projection display. The first light source 81, the second light source 82, and the first pump light source 5 output light beams with different colors, and realize the co-path beam combining of the three beams, enriching the color level of the projection light source, expanding the color gamut of the projected image, improving the clarity and overall visual effect of the projection display, and adapting to the projection display needs in different scenarios.

[0037] Example 4: This embodiment provides a projection device for achieving projection imaging. Combined with... Figures 9-10As shown, the projection device in this embodiment includes the projection light source system described in Embodiment 3, and further includes a prism 91, a digital micromirror device 92, and a projection lens 93. The digital micromirror device 92 is used to image-modulate the light beam after it has been homogenized by the homogenizing and shaping module 7 and reflect and output the image beam. The projection lens 93 is used to focus and shape the image beam and project it outward to form a projected image. The prism 91 is disposed between the homogenizing and shaping module 7, the digital micromirror device 92, and the projection lens 93, and is used to refract and guide the light beam emitted from the homogenizing and shaping module 7 to the digital micromirror device 92, and to refract and conduct the image beam modulated by the digital micromirror device 92 to the projection lens 93. It flexibly changes the beam propagation direction by relying on its own multi-plane optical reflection and refraction characteristics to realize the optical path folding layout. The uniform light shaping module 7 also includes a second convex lens 73 disposed on the light-emitting side of the first convex lens 72. The light-emitting axis of the second convex lens 73 is perpendicular to the corresponding incident surface on the prism 91, so that the parallel light beam collimated and shaped by the second convex lens 73 enters the corresponding incident surface of the prism 91 at a perpendicular angle, reducing refraction loss and dispersion deviation when the light beam is incident. In a specific embodiment, the projection device is a projector, a laser projection device, a portable projection device, or other display devices that use spatial light modulation and projection imaging links.

[0038] In practice, the projection light source system combines the three beams and then homogenizes and shapes them through the homogenizing and shaping module 7. The prism 91 receives the beam emitted from the homogenizing and shaping module 7 in the projection light source system and performs optical path deflection and guidance, transmitting the beam to the digital micromirror device 92. The digital micromirror device 92 performs pixel-level imaging modulation and reflection processing on the incident beam. The prism 91 again deflects and guides the imaging beam output by the digital micromirror device 92, sending the imaging beam to the projection lens 93. After receiving the imaging beam, the projection lens 93 focuses and shapes the imaging beam and projects it outward to form an image. Finally, the processed imaging beam is projected outward to complete the image formation.

[0039] It should be noted that the key point of this embodiment is that the projection device integrates the projection light source system described in Embodiment 3. The projection light source system can achieve uniform light integration and combine the pump excitation beam, the output beam of the first light source 81, and the output beam of the second light source 82, providing a stable beam foundation for subsequent projection imaging. At the same time, the projection light source system integrates a laser shaping module, which can specifically compensate for the difference in the divergence characteristics of the laser beam in the slow axis direction and the fast axis direction, thereby improving the quality and pumping efficiency of the pump beam. This results in uniform brightness and stable propagation of the combined multicolor beam, significantly improving the clarity, brightness uniformity, and color reproduction of the subsequent projected image, and optimizing the overall projection effect. As for the specific structure of the prism 91, it will not be described in detail here. Its core function is beam deflection and guidance. In other embodiments, multiple light guide elements can also be combined to guide a specific beam according to a preset path based on the actual optical path layout and beam transmission requirements. In addition, the projection device described in this embodiment also includes other conventional structures known to those skilled in the art, such as the housing. The specific structures and connection methods are all existing mature technologies and will not be described in detail here.

[0040] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A laser shaping module, characterized in that: include: A laser (1) is used to output a laser beam, and the laser beam has different divergence characteristics in the fast axis direction and the slow axis direction; A spherical lens (2) is disposed on the light-emitting side of the laser (1) and is used to perform at least one of the following on the laser beam: pre-convergence focusing, collimation adjustment, beam compression, and angle distribution redistribution; A cylindrical lens module (3) is disposed on the light-emitting side of the spherical lens (2); along the laser beam propagation direction, the cylindrical lens module (3) has a first working surface (31) and a second working surface (32) opposite to each other; the cylindrical axis of the first working surface (31) is parallel to the fast axis direction and is used to shape the laser beam in the slow axis direction; the cylindrical axis of the second working surface (32) is parallel to the slow axis direction and is used to shape the laser beam in the fast axis direction. The pump source (5) is used to receive the shaped laser beam and is pumped and excited under the action of the laser beam.

2. The laser shaping module according to claim 1, characterized in that: The first working surface (31) and the second working surface (32) are both recessed inward to expand and shape the laser beams in the slow axis direction and the fast axis direction, respectively. The radius of curvature of the first working surface (31) is smaller than the radius of curvature of the second working surface (32); The extension dimension of the first working surface (31) in its column axis direction is smaller than the extension dimension of the second working surface (32) in its column axis direction.

3. The laser shaping module according to claim 1, characterized in that: The cylindrical lens module (3) adopts an integrated structure or a separate structure; When the cylindrical lens module (3) adopts a split structure, the cylindrical lens module (3) includes at least two cylindrical lenses, and the first working surface (31) and the second working surface (32) are respectively disposed on different cylindrical lenses to independently shape the laser beams in the slow axis direction and the fast axis direction; The pump light source (5) includes a light-emitting body (51) and a fluorescent layer (52) disposed on the surface of the light-emitting body (51); the fluorescent layer (52) is disposed on the side facing the laser beam and is pumped and excited by the laser beam.

4. The laser shaping module according to claim 1, characterized in that: Also includes: The first light guide element (4) is located between the light-emitting side of the cylindrical lens module (3) and the pump light source (5) to guide the shaped laser beam to the pump light source (5). The first shaping lens module (6) is disposed between the first light guide element (4) and the pump light source (5), and at least one optical surface of the first shaping lens module (6) protrudes. in, The main optical axis of the first shaping lens module (6) is perpendicular to the main optical axis of the cylindrical lens module (3), and the two main optical axes intersect to form the first perpendicular foot position; The first light guide element (4) is located at the first vertical foot position, and the first light guide element (4) is arranged at 45° relative to the main optical axis of the first shaping lens module (6) and the main optical axis of the cylindrical lens module (3); The first light guide element (4) is a dichroic mirror.

5. The laser shaping module according to claim 4, characterized in that: The first shaping lens module (6) includes a first shaping lens (61) and a second shaping lens (62) having the same main optical axis. The first shaping lens (61) is arranged close to the pump light source (5), and the second shaping lens (62) is arranged close to the first light guide element (4). The area of ​​the protruding optical surface on the first shaping lens (61) is smaller than the area of ​​the protruding optical surface on the second shaping lens (62); The radius of curvature of the protruding optical surface on the first shaping lens (61) is smaller than the radius of curvature of the protruding optical surface on the second shaping lens (62).

6. A projection light source system, characterized in that: The laser shaping module according to any one of claims 1-5 is further comprising a uniform light shaping module (7). The homogenizing and shaping module (7) is used to homogenize and shape the pump excitation beam output by the laser shaping module.

7. The projection light source system according to claim 6, characterized in that: The homogenizing and shaping module (7) includes a homogenizing mirror (71) and a first convex lens (72) arranged sequentially along the propagation direction of the pump excitation beam. The uniform light shaping module (7) is located on the side of the first light guide element (4) away from the pump light source (5).

8. The projection light source system according to claim 6, characterized in that: The first light guide element (4) is provided with a third convex lens (83), a second light guide element (84), a first light source (81), and a second light source (82) on the side away from the cylindrical lens module (3). The light output axes of the third convex lens (83) and the first light source (81) are collinear with the light output axis of the cylindrical lens module (3), and the third convex lens (83) and the first light source (81) are located on opposite sides of the second light guide element (84), wherein the third convex lens (83) is arranged on the side closer to the first light guide element (4). The light output axis of the second light source (82) is perpendicular to the light output axis of the third convex lens (83), and the two principal optical axes intersect to form the second perpendicular foot position; The second light guide element (84) is disposed at the second vertical position, and the second light guide element (84) is arranged at 45° relative to the light output axis of the second light source (82) and the light output axis of the third convex lens (83); The second light guide element (84) is a dichroic mirror.

9. The projection light source system according to claim 8, characterized in that: A second shaping lens module (65) is provided between the first light source (81) and the second light guide element (84), and the light output axis of the second shaping lens module (65) is collinear with the light output axis of the first light source (81). A third shaping lens module (86) is provided between the second light source (82) and the second light guide element (84), and the light output axis of the third shaping lens module (86) is collinear with the light output axis of the second light source (82); Both the second shaping lens module (65) and the third shaping lens module (86) have at least one optical surface protruding. The colors of the pump light source (5), the first light source (81), and the second light source (82) are not exactly the same.

10. A projection device, characterized in that: The projection light source system of claim 6 further includes a prism (91), a digital micromirror device (92), and a projection lens (93). The digital micromirror device (92) is used to image modulate the beam after it has been image shaped by the beam homogenization and shaping module (7) and reflect and output the image beam. The projection lens (93) is used to focus and shape the imaging beam and project the image outward; The prism (91) is located between the uniform light shaping module (7), the digital micromirror device (92), and the projection lens (93) to refract and guide the light beam emitted from the uniform light shaping module (7) to the digital micromirror device (92), and to refract and transmit the imaging light beam modulated by the digital micromirror device (92) to the projection lens (93).

Images