A combined beam light source device for an optical-mechanical system

Abstract

This application provides a beam combining light source device for an optomechanical system, comprising: an emission module including multiple monochromatic light sources, each with a different emission wavelength, and at least one of the monochromatic light sources being a large divergence angle light source; a collimation module including collimating lens groups corresponding one-to-one with each monochromatic light source, each collimating lens group including a condenser lens and a collimating lens arranged sequentially along the optical path; and a beam combining imaging module including at least two dichroic filters and a coupling lens, each dichroic filter being obliquely disposed at the intersection of the transmission optical paths of each parallel beam, used to combine parallel beams from different directions into a combined beam propagating along the same optical axis, and image it onto the receiving surface of the optomechanical system in a critical illumination manner. This application overcomes the physical performance bottleneck of the single-lens scheme, where light collection capability and collimation accuracy cannot be simultaneously achieved, realizing large-angle light collection and high collimation output under large divergence angle light source conditions.

Description

Technical Field

[0001] This application relates to the technical field of optical design, and more specifically, to a beam combining light source device for an optomechanical system. Background Technology

[0002] Currently, sophisticated optomechanical systems typically require a wide-spectrum, high-power, and highly uniform light source to provide stable illumination. Combining LEDs of various wavelengths to achieve wide-spectrum output has become the mainstream choice.

[0003] In existing LED beam combining solutions, each LED typically has only a single collimating lens in front of it, which performs both light collection and collimation functions. However, for LED light sources with large divergence angles, the single collimating lens has inherent physical performance bottlenecks: if the numerical aperture is increased to collect more large-angle light, spherical aberration and coma will increase rapidly, resulting in ineffective collimation of edge rays and deterioration of the emitted beam quality; if collimation accuracy is prioritized, the numerical aperture must be reduced, causing significant loss of edge rays. Light collection capability and collimation accuracy present an irreconcilable contradiction in single-lens solutions, and existing technologies have not offered an effective solution. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a beam combining light source device for an optomechanical system, which aims to overcome at least one of the above-mentioned defects.

[0005] In a first aspect, this application provides a beam combining light source device for an optomechanical system, comprising: The transmitting module includes multiple monochromatic light sources, each with a different emission wavelength, and at least one of the monochromatic light sources is a large divergence angle light source; The collimation module includes collimating lens groups that correspond one-to-one with each monochromatic light source. Each collimating lens group includes a condenser lens and a collimating lens arranged sequentially along the optical path. The condenser lens is arranged adjacent to the emitting surface of the corresponding monochromatic light source and is used to collect the large divergence angle beam emitted by the corresponding monochromatic light source and perform initial convergence. The collimating lens is arranged behind the condenser lens in the same collimating lens group and is used to perform secondary compression and collimation of the divergence angle of the beam emitted from the condenser lens to output a parallel beam. The beam combining imaging module includes at least two dichroic spectra and a coupling lens. Each dichroic spectra are obliquely disposed at the intersection of the transmission optical paths of each parallel beam, and are used to combine parallel beams from different directions into a beam that propagates along the same optical axis. The coupling lens is disposed on the transmission optical path of the beam combining, and is used to converge the beam combining and image it onto the receiving surface of the optomechanical system in a critical illumination manner.

[0006] In one possible implementation, the condenser lens is used to collect large divergence angle beams emitted by the corresponding monochromatic light source and perform initial focusing, as well as to suppress spherical aberration and coma generated under large numerical aperture conditions. The collimating lens is used to compress the divergence angle of the light beam emitted from the condenser lens and collimate it.

[0007] In one possible implementation, it also includes: A large-area camera, wherein the large-area camera is used to image the light spot on the receiving surface; A computer screen, connected to the large-target camera, is used to display a grayscale image of the light spot captured by the large-target camera.

[0008] In one possible implementation, the emission module includes a first monochromatic light source, a second monochromatic light source, and a third monochromatic light source, wherein the first monochromatic light source and the second monochromatic light source are large divergence angle light sources, and the divergence angle of the third monochromatic light source is smaller than that of the first monochromatic light source and the second monochromatic light source; The first monochromatic light source emits light in the invisible light band, while the second and third monochromatic light sources emit light in the visible light band.

[0009] In one possible implementation, the second monochromatic light source is placed parallel to the third monochromatic light source, and the first monochromatic light source is placed perpendicular to the second and third monochromatic light sources.

[0010] In one possible implementation, the front and rear surfaces of each color separator are coated with an antireflection film and a color separation film, respectively, and each color separator is tilted at a 45-degree angle in the optical path.

[0011] In one possible implementation, it also includes: The feedback control module includes a photodetector and a PID controller. The photodetector is used to detect the optical power of the combined light in real time and convert it into a voltage value. The PID controller is connected to each monochromatic light source respectively. The PID controller is configured to compare the voltage value with a preset target voltage value, and when the detected voltage value is lower than the preset target voltage value, increase the driving current of the corresponding monochromatic light source to increase the optical power, until the voltage value recovers to the preset target value. In one possible implementation, the feedback control module further includes: The display screen is used to display the actual current values ​​of each monochromatic light source obtained from sampling in real time, so as to observe the stability of the actual current of the LED.

[0012] In one possible implementation, it also includes: A debugging controller is connected to the large target camera and each monochromatic light source, and the debugging controller is configured as follows: It supplies power to the LED light source and controls each monochromatic light source to light up individually; Acquire the light spot images formed on the receiving surface by each monochromatic light source captured by the large target camera; Calculate the center coordinates of each light spot based on the grayscale distribution of each light spot image; The beam alignment state of each monochromatic light source is determined based on the deviation between the center coordinates of each light spot.

[0013] In one possible implementation, the debug controller is further configured to: Control the illumination of each monochromatic light source in the visible light band, acquire the spot images corresponding to each monochromatic light source in the visible light band, and adjust the beam alignment state of each monochromatic light source in the visible light band based on the deviation between the center coordinates of the spot images corresponding to each monochromatic light source in the visible light band. Control the illumination of the monochromatic light source in the invisible light band, obtain the spot image corresponding to the monochromatic light source in the invisible light band, and adjust the alignment state of the monochromatic light source in the invisible light band and the visible light band combined beam based on the deviation between the center coordinates of the spot image corresponding to the monochromatic light source in the invisible light band and the center coordinates of the aligned visible light band combined beam. Control all monochromatic light sources to light up simultaneously, acquire the combined light spot image captured by the large target camera, and calculate the illumination uniformity of the receiving surface based on the grayscale distribution of the combined light spot image. When the illumination uniformity is lower than a preset threshold, the monochromatic light source path that needs to be adjusted is determined based on the deviation between the center coordinates of each light spot.

[0014] This application provides a beam combining light source device for an optomechanical system, comprising: an emission module including multiple monochromatic light sources, each with a different emission wavelength, and at least one of the monochromatic light sources being a large divergence angle light source; a collimation module including collimating lens groups corresponding one-to-one with each monochromatic light source, each collimating lens group including a condenser lens and a collimating lens arranged sequentially along the optical path; and a beam combining imaging module including at least two dichroic filters and a coupling lens, each dichroic filter being obliquely disposed at the intersection of the transmission optical paths of each parallel beam, used to combine parallel beams from different directions into a combined beam propagating along the same optical axis, and image it onto the receiving surface of the optomechanical system in a critical illumination manner. This application overcomes the physical performance bottleneck of the single-lens scheme, where light collection capability and collimation accuracy cannot be simultaneously achieved, realizing large-angle light collection and high collimation output under large divergence angle light source conditions.

[0015] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is one of the structural schematic diagrams of a beam combining light source device for an optomechanical system provided in an embodiment of this application; Figure 2 This is a second schematic diagram of a beam combining light source device for an optomechanical system provided in an embodiment of this application; Figure 3 This is the third schematic diagram of a beam combining light source device for an optomechanical system provided in the embodiments of this application; Figure 4 This is a schematic diagram of a single optical path provided in an embodiment of this application; Figure 5 This is a schematic diagram of the simulated image plane irradiance distribution provided in the embodiments of this application; Figure 6 This is a cross-sectional view of the image plane irradiance distribution provided in an embodiment of this application; Figure 7 This is a schematic diagram of the image plane uniformity calculation results provided in the embodiments of this application; Figure 8 A flowchart illustrating the debugging method of the beam combining light source device provided in the embodiments of this application; Figure 9 This is a flowchart of the step-by-step beam-combining debugging method provided in the embodiments of this application.

[0018] Explanation of reference numerals in the attached diagram: 1-First LED lens barrel and base; 2-Second LED lens barrel and base; 3-Third LED lens barrel and base; 11-First monochromatic light source; 12-Second monochromatic light source; 13-Third monochromatic light source; 21-First collimating lens group; 22-Second collimating lens group; 23-Third collimating lens group; 31-Color separator one; 32-Color separator two; 4-Coupled lens; 5-Receiving surface; 6-Large target camera; 7-Computer screen; 100-Transmitting module; 200-Collimating module; 300-Beam combining imaging module. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. Based on the embodiments of this application, every other embodiment obtained by those skilled in the art without inventive effort falls within the scope of protection of this application.

[0020] First, the applicable scenarios for this application will be introduced. This application can be applied to the technical field of optical design.

[0021] Research has shown that sophisticated optomechanical systems typically require broadband, high-power, and highly uniform light sources to provide stable illumination. Commonly used light source modules include halogen lamps, LEDs, and xenon lamps. Among these, halogen lamps offer stable and high-brightness broadband output, covering the entire visible light spectrum and extending into the near-infrared region. However, they generate significant heat during emission, requiring specialized cooling systems, and have a lifespan of only about 2,000 hours, resulting in short maintenance cycles and high long-term costs. Xenon lamps primarily emit light through arc excitation, offering a wide spectral range covering wavelengths from ultraviolet to visible and infrared light, and possessing extremely high luminous intensity. However, they require a driver, leading to higher overall costs, and the issue of high-temperature heat generation must also be considered. LEDs offer a wide wavelength range, covering the visible spectrum and parts of the infrared and ultraviolet bands. Due to their high efficiency, long lifespan, and stable spectral output, they have become the mainstream choice in modern lighting in recent years. Researchers have achieved broadband output effects by combining LEDs of various wavelengths.

[0022] Current technologies for using LEDs in combination generally have some problems: because the light emission angle of a single LED is large, there is no effective focusing of the diffused light from the LED, resulting in low light power utilization; the output light power cannot be flexibly controlled, and the output wavelength cannot be adjusted according to needs; the light after LED collimation and beam combining is coupled into the optical fiber, causing energy loss, and the lighting area is too small to be suitable for large-area lighting needs; and the later maintenance is difficult, and the LEDs for lighting cannot be flexibly replaced.

[0023] Specifically, the shortcomings of existing technologies are mainly reflected in the following two aspects.

[0024] First, existing solutions lack methods for debugging and calibrating multi-beam combining optical paths. Current LED beam combining light source solutions typically only describe the structural connections between the LED, collimating lens, dichroic mirror, and housing, without addressing methods for debugging or calibrating the optical path after beam combining. In practical engineering, multiple dichroic mirrors need to be installed at an angle, and any deviation in the orientation of each path will cause the combined beam spot to split or misalign. This is especially true when the combined optical path includes invisible light bands, whose spot positions cannot be directly observed with the naked eye, making beam alignment far more difficult than with all-visible light solutions. Existing technologies lack effective solutions to this problem.

[0025] Secondly, the single collimating lens scheme suffers from a physical performance bottleneck, making it difficult to simultaneously achieve both high numerical aperture light collection and high collimation. According to optical design engineering specifications, a single lens is limited by aberrations, resulting in an upper limit to its relative aperture, making it difficult to simultaneously meet the requirements of high numerical aperture light collection and high collimation output. For LED light sources with large divergence angles, using only one collimating lens, while increasing the numerical aperture can collect more light, will rapidly increase spherical aberration and coma, leading to ineffective collimation of edge rays and deterioration of the output beam quality. Conversely, prioritizing collimation requires sacrificing light collection efficiency, resulting in significant loss of edge rays. This inherent contradiction is a physical bottleneck that the single-lens scheme cannot fundamentally overcome, and existing technologies have not proposed an effective solution.

[0026] Based on this, this application provides a beam combining light source device for an optomechanical system. By separating and coordinating the functions of the condenser lens and the collimating lens, it simultaneously achieves large-angle light collection and high collimation output under the condition that the monochromatic light source is a large divergence angle source, overcoming the physical performance bottleneck of the single-lens scheme where light collection capability and collimation accuracy cannot be simultaneously achieved. The beam combining imaging module combines multiple parallel beams of different wavelengths into a beam combining light, and images it onto the receiving surface using critical illumination combined with defocusing, achieving a wide-spectrum, highly uniform illumination output. The feedback control module realizes closed-loop stable control of the current value of each monochromatic light source. The debugging controller, in conjunction with a large target camera, enables quantifiable debugging and calibration of multiple beam combining optical paths including invisible light bands. The modular lens barrel design and electrical isolation partitioning improve the device's maintenance convenience and anti-interference capability.

[0027] See Figure 1 The beam combining light source device provided in this application embodiment includes an emission module 100, a collimation module 200, and a beam combining imaging module 300.

[0028] The transmitting module 100 includes multiple monochromatic light sources, each with a different emission wavelength, and at least one of the monochromatic light sources is a large divergence angle light source.

[0029] Specifically, the emission module 100 is used to provide multiple beams of different wavelengths. The monochromatic light sources together cover the wide spectrum illumination range required by the optomechanical system, while the large divergence angle light source meets the optomechanical system's need for high-power illumination.

[0030] In one implementation, see Figure 2 The transmitting module 100 includes three monochromatic light sources: a first monochromatic light source 11, a second monochromatic light source 12, and a third monochromatic light source 13. The first and second monochromatic light sources 11 and 12 are large divergence angle light sources, while the third monochromatic light source 13 has a smaller divergence angle than the first and second monochromatic light sources 11 and 12. The first monochromatic light source 11 emits light in the invisible light band, while the second and third monochromatic light sources 12 and 13 emit light in the visible light band. The second and third monochromatic light sources 12 are placed parallel to each other, while the first monochromatic light source 11 is placed perpendicular to both the second and third monochromatic light sources 12 and 13. Each monochromatic light source has a completely independent light control channel, allowing for individual control of its emission power.

[0031] In a specific example, the first monochromatic light source 11 has a center wavelength of 850 nm and a divergence angle of 150 degrees, outputting a beam of light in the invisible light band. The second monochromatic light source 12 has a center wavelength of 730 nm and a divergence angle of 80 degrees, outputting a beam of light in the visible light band. The third monochromatic light source 13 has a center wavelength of 565 nm and a divergence angle of 130 degrees, outputting a beam of light in the visible light band. The emitting area of ​​all three is 1 mm × 1 mm. Each monochromatic light source is detachably mounted on the lens barrel heat sink base for easy replacement later.

[0032] Each monochromatic light source is installed in its corresponding LED lens barrel. Specifically, the first monochromatic light source 11 is installed in the first LED lens barrel and base 1, the second monochromatic light source 12 is installed in the second LED lens barrel and base 2, and the third monochromatic light source 13 is installed in the third LED lens barrel and base 3.

[0033] See Figure 3 The collimation module 200 includes collimating lens groups, each corresponding to a monochromatic light source. Specifically, the collimation module 200 includes a first collimating lens group 21, a second collimating lens group 22, and a third collimating lens group 23. The first collimating lens group 21 corresponds to the first monochromatic light source 11, the second collimating lens group 22 corresponds to the second monochromatic light source 12, and the third collimating lens group 23 corresponds to the third monochromatic light source 13.

[0034] Each collimating lens group includes a condenser lens and a collimating lens arranged sequentially along the optical path. The condenser lens is positioned adjacent to the emitting surface of the corresponding monochromatic light source and is used to collect the large divergence angle beam emitted by the corresponding monochromatic light source and perform initial focusing. The collimating lens is positioned behind the condenser lens in the same collimating lens group and is used to perform secondary compression and collimation of the beam emitted from the condenser lens to output a parallel beam, providing a highly collimated incident condition for subsequent beam combining.

[0035] A condenser lens is used to collect large-divergence beams emitted from a corresponding monochromatic light source and perform initial focusing, as well as suppress spherical aberration and coma caused under large numerical aperture conditions. A collimating lens is used to perform secondary divergence angle compression and collimation on the beam emitted from the condenser lens. The light-collecting function performed by the condenser lens and the secondary divergence angle compression function performed by the collimating lens are independent of each other.

[0036] In one embodiment, the condenser lens is an aspherical lens, and the collimating lens is a biconvex lens. The condenser lens and collimating lens in each collimating lens group are fixed in the same lens barrel through a shaft hole.

[0037] See Figure 4 Taking a single monochromatic light source and its corresponding collimating lens group as an example, the condenser lens is positioned close to the emitting surface of the monochromatic light source, approximately 1mm to 2mm away. The condenser lens has a numerical aperture of 0.8, effectively collecting beams with large divergence angles ranging from 106 to 150 degrees, reducing energy loss during collimation. The condenser lens is an aspherical lens with a larger aperture and a higher numerical aperture; the aperture is 26mm, allowing it to be positioned close to other optical elements. The biconvex lens receives the beam emitted from the aspherical lens, acting as a secondary compressor of the divergence angle. Even after initial collimation by the aspherical lens, the large divergence angle beam still retains a certain divergence angle; the biconvex lens further deflects it into a parallel beam, improving overall directionality. Used together, the condenser lens collects and collimates the beam from the monochromatic light source, outputting a parallel beam with a divergence angle of less than 2 degrees, providing high-collimation incident conditions for subsequent dichroic beam combining and improving uniformity.

[0038] This application resolves the contradiction between light-gathering capability and collimation accuracy in single-lens solutions by functionally separating an aspherical lens and a biconvex lens, employing a two-stage correction method. The first-stage aspherical lens utilizes its aspherical surface shape to efficiently capture large-angle edge rays under large numerical aperture conditions, while controlling primary aberrations, thus solving the problem of large aberrations inherent in single-lens light gathering. The second-stage biconvex lens is dedicated to collimation, further compressing divergent light. This two-stage division of labor achieves both large-angle aperture light gathering and high collimation output, overcoming the numerical aperture limitations of a single lens.

[0039] The beam combining imaging module 300 includes at least two dichroic spectra and a coupling lens 4. Each dichroic spectra are tilted at the intersection of the transmission paths of the parallel beams to combine parallel beams from different directions into a combined beam propagating along the same optical axis. The coupling lens 4 is positioned on the transmission path of the combined beam to converge the combined beam and image it onto the receiving surface 5 of the optomechanical system in a critical illumination manner. The receiving surface 5 is offset from the imaging focal plane to improve illumination uniformity.

[0040] In one embodiment, the beam combining imaging module 300 includes a first dichroic filter 31 and a second dichroic filter 32. The front and rear surfaces of each dichroic filter are coated with an antireflective film and a dichroic film, respectively, and each dichroic filter is tilted at a 45-degree angle in the optical path.

[0041] Specifically, the first monochromatic light source 11 outputs a first parallel beam after passing through the first collimating lens group 21, the second monochromatic light source 12 outputs a second parallel beam after passing through the second collimating lens group 22, and the third monochromatic light source 13 outputs a third parallel beam after passing through the third collimating lens group 23. The second and third parallel beams are parallel to each other in the propagation direction, and the first parallel beam is perpendicular to the two parallel beams mentioned above.

[0042] The dichroic filter 31 is placed at an angle at the intersection of the transmission paths of the first parallel beam and the second parallel beam. The front surface of the dichroic filter 31 faces the first monochromatic light source 11, and the rear surface faces the second monochromatic light source 12. The front and rear surfaces are respectively coated with an anti-reflection film and a dichroic film. The dichroic filter 31 can transmit the first parallel beam and reflect the second parallel beam to form a first combined beam.

[0043] The second dichroic filter 32 is placed at an angle at the intersection of the transmission paths of the first combined beam and the third parallel beam. The front surface of the second dichroic filter 32 faces the first combined beam, and the rear surface faces the third monochromatic light source 13. The front and rear surfaces are coated with an anti-reflection film and a dichroic film, respectively. The second dichroic filter 32 can transmit the first combined beam wavelength and reflect the third parallel beam to form a combined beam. The output wavelength of the combined beam covers 500nm to 900nm, and the wavelength range includes visible light and part of the near-infrared light.

[0044] A coupling lens 4 is positioned along the transmission direction of the combined beam. The coupling lens 4 converges the combined beam and couples it into the light guide. The emitting surface of the monochromatic light source serves as the object surface, and after passing through the optical system, it is imaged at approximately 10 times magnification. The magnification depends on the size of the incident surface and the required uniformity. The image-side numerical aperture of the optical path is designed to be smaller than that of the light guide to improve energy utilization efficiency and reduce coupling loss. The receiving surface 5 is located near the image plane of the light source. In actual use, the receiving surface 5 is placed 1mm to 2mm off-focus near the imaging plane. This defocusing operation softens the image of the monochromatic light source's emitting structure, eliminates filament shadows, and improves illumination uniformity. Within a 6.8mm × 6.8mm area, the illumination uniformity reaches 93%, meeting the requirements for high uniformity.

[0045] See Figure 5 The image surface irradiance distribution is a uniform square spot. See also Figure 6 The cross-sectional diagram of the Y-axis irradiance distribution shows that the energy of the light spot is concentrated in the central region. (See also...) Figure 7 Based on the uniformity values ​​calculated from the maximum and minimum irradiance, the illumination uniformity reaches 93% within a range of 6.8mm × 6.8mm.

[0046] The beam combining light source device also includes a base, and each optical element is fixed to the base by positioning pins to ensure assembly accuracy.

[0047] The base has positioning slots, and each dichroic lens is fixed to the positioning slot via a corresponding dichroic lens holder using positioning pins to ensure the initial installation angle of each dichroic lens. Each monochromatic light source, the condenser lens and collimating lens in each collimating lens group, and the coupling lens 4 are all fixed to the base using positioning pins. The condenser lens and collimating lens in each collimating lens group are fixed within the same lens barrel via a shaft hole fit. The emitting surface of the monochromatic light source, the condenser lens, and the coupling lens 4 are all precisely positioned relative to the base using positioning pins. Precise positioning is achieved between the outer circumference of the lens and the inner hole of the lens barrel via a shaft hole fit. The air gap and eccentric tilt of the two lenses within the collimating lens group can be tested using a center offset measuring instrument to ensure that the assembly tolerances of the lens barrel meet the requirements.

[0048] Each monochromatic light source and its corresponding collimating lens assembly are fixed within an independent lens barrel module. Each lens barrel module is detachably connected to the base via positioning pins. Individual lens barrel modules can be independently disassembled and replaced without recalibrating the optical path. The beam combining light source device contains a metal partition that divides the device into an optical cavity and an electrical cavity. The emission module 100, collimating module 200, and beam combining imaging module 300 are installed within the optical cavity, while the electrical control board is integrated within the electrical cavity. These components are separated from the optical path by the partition to prevent crosstalk.

[0049] See Figure 2The beam combining light source device also includes a large-area camera 6 and a computer screen 7. The large-area camera 6 is located at the rear of the beam combining light source device and is used to image the light spot on the receiving surface 5. The large-area camera 6 is responsive to both visible and near-infrared light bands. The computer screen 7 is connected to the large-area camera 6 and is used to display a grayscale image of the light spot captured by the large-area camera 6.

[0050] The beam combining light source device also includes a feedback control module. The feedback control module includes a photodetector and a PID controller. The photodetector is used to detect the light intensity of the combined light in real time and convert it into a voltage value. The PID controller is connected to each monochromatic light source. The PID controller is configured to compare the voltage value with a preset target voltage value; when the detected voltage value is lower than the preset target value, the drive current of the corresponding monochromatic light source is increased, i.e., the optical power is increased, until the voltage value recovers to the preset target value. The drive current of each monochromatic light source is independently adjusted by the PID controller.

[0051] The feedback control module also includes a display screen, which shows the actual current values ​​of each sampled monochromatic light source in real time, facilitating user monitoring and calibration. The current value supports both local manual adjustment and remote control; after modifying the set current, the PID controller responds quickly and stabilizes at the new value.

[0052] The beam combining light source device also includes a tuning controller. The tuning controller is connected to the large-target camera 6 and each monochromatic light source. See [link / reference] Figure 8 The debug controller is configured to perform the following debug steps.

[0053] S101 controls each monochrome light source to be lit individually.

[0054] S102. Acquire the light spot images formed on the receiving surface 5 by various monochromatic light sources captured by the large target camera 6.

[0055] S103. Calculate the center coordinates of each light spot based on the grayscale distribution of each light spot image.

[0056] S104. Determine the beam alignment state of each monochromatic light source based on the deviation between the center coordinates of each light spot.

[0057] During the debugging process, see Figure 9 The specific operations to be performed on the debug controller are as follows.

[0058] S201. Control the second monochromatic light source 12 and the third monochromatic light source 13, which are in the visible light band, to be lit. Obtain the light spot images corresponding to the second monochromatic light source 12 and the third monochromatic light source 13. Adjust the beam alignment state of the second monochromatic light source 12 and the third monochromatic light source 13 according to the deviation between the center coordinates of the light spot images corresponding to the two visible light band monochromatic light sources.

[0059] In this step, the two monochromatic light sources in the visible light band are first combined and adjusted. Since the emission bands of the second monochromatic light source 12 and the third monochromatic light source 13 are both in the visible light band, the large target camera 6 can directly capture the images of the two light spots, and the grayscale images of the two light spots can be clearly displayed on the computer screen 7. The adjustment controller calculates the center coordinates of the two light spots according to the grayscale distribution, and then obtains the deviation between the center coordinates of the two light spots. The operator adjusts the posture of the corresponding color separator 32 according to the deviation until the deviation of the center coordinates of the two light spots meets the preset alignment accuracy requirements, thus completing the beam combining and alignment of the two monochromatic light sources in the visible light band.

[0060] S202. Light up the first monochromatic light source 11, which controls the emission band to be the invisible light band, and obtain the light spot image corresponding to the first monochromatic light source 11. Based on the deviation between the center coordinates of the light spot image corresponding to the first monochromatic light source 11 and the center coordinates of the aligned visible light band combined beam, adjust the alignment state of the first monochromatic light source 11 and the visible light band combined beam.

[0061] In this step, after the two monochromatic light sources in the visible light band have been aligned and combined, the first monochromatic light source 11 in the invisible light band is adjusted for beam combining. The first monochromatic light source 11 emits invisible light, and its spot position cannot be directly observed by the human eye. However, the large-area camera 6 has a response capability to the near-infrared band and can capture the spot image formed by the first monochromatic light source 11 on the receiving surface 5 and display it as a grayscale image. The adjustment controller calculates the center coordinates of the spot corresponding to the first monochromatic light source 11 and compares them with the center coordinates of the aligned visible light band combined beam in S201 to obtain the deviation between the two. The operator adjusts the orientation of the corresponding color separator 31 according to this deviation until the deviation between the center coordinates of the invisible light band spot and the center coordinates of the visible light band combined beam meets the preset alignment accuracy requirements, thus completing the alignment of the invisible light band monochromatic light source and the visible light band combined beam.

[0062] S203. Control all monochromatic light sources to light up simultaneously, acquire the combined light spot image captured by the large target camera 6, and calculate the illumination uniformity of the receiving surface 5 based on the grayscale distribution of the combined light spot image.

[0063] In this step, after the three monochromatic light sources have completed their beam combining and alignment adjustments, the three monochromatic light sources are simultaneously illuminated, and the large target camera 6 captures an image of the beam combining light spot formed on the receiving surface 5. Based on the grayscale distribution of the beam combining light spot image, the adjustment controller extracts the illuminance value of each pixel in a specified area on the receiving surface 5, calculates the ratio of the minimum illuminance to the maximum illuminance in that area, and obtains the illumination uniformity value of the receiving surface 5.

[0064] S204. When the illumination uniformity is lower than the preset threshold, determine the monochromatic light source path that needs to be adjusted based on the deviation between the center coordinates of each light spot.

[0065] In this step, the illumination uniformity value calculated in S203 is compared with a preset threshold. The preset threshold is the illumination uniformity index required by the design of the beam combining light source device. If the illumination uniformity reaches or exceeds the preset threshold, it indicates that the beam combining alignment of the three monochromatic light sources meets the requirements, and the debugging is completed. If the illumination uniformity is lower than the preset threshold, it indicates that at least one monochromatic light source has an alignment deviation in its optical path. At this time, the debugging controller traces back the deviation data of the center coordinates of each light spot recorded in S201 and S202 to determine the monochromatic light source optical path with the largest deviation, and this optical path is identified as the object to be debugged. The operator makes fine adjustments to the posture of the corresponding color separator based on the deviation data, and then repeats steps S201 to S203 until the illumination uniformity meets the preset threshold requirements.

[0066] Compared with existing technologies, the beam combining light source device provided in this application achieves both large-angle light collection and high collimation output under the condition that the monochromatic light source is a large divergence angle source, by functionally separating and coordinating the condensing lens and collimating lens. This overcomes the physical performance bottleneck of the single-lens scheme, where light collection capability and collimation accuracy cannot be simultaneously achieved. The beam combining imaging module 300 combines multiple parallel beams of different wavelengths into a single beam, and images it onto the receiving surface 5 using critical illumination combined with defocusing, achieving a wide-spectrum, highly uniform illumination output. The feedback control module achieves closed-loop stable control of the light power of each monochromatic light source. The debugging controller, in conjunction with the large target camera 6, enables quantifiable debugging and calibration of multiple beam combining optical paths, including those in the invisible light band. The modular lens barrel design and electrical isolation partitioning improve the device's ease of maintenance and anti-interference capability.

[0067] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0068] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0069] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0070] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0071] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0072] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, 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 this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A beam combining light source device for an optomechanical system, characterized in that, include: The transmitting module includes multiple monochromatic light sources, each with a different emission wavelength, and at least one of the monochromatic light sources is a large divergence angle light source; The collimation module includes collimating lens groups that correspond one-to-one with each monochromatic light source. Each collimating lens group includes a condenser lens and a collimating lens arranged sequentially along the optical path. The condenser lens is arranged adjacent to the emitting surface of the corresponding monochromatic light source and is used to collect the large divergence angle beam emitted by the corresponding monochromatic light source and perform initial convergence. The collimating lens is arranged behind the condenser lens in the same collimating lens group and is used to perform secondary compression and collimation of the divergence angle of the beam emitted from the condenser lens to output a parallel beam. The beam combining imaging module includes at least two dichroic spectra and a coupling lens. Each dichroic spectra are obliquely disposed at the intersection of the transmission optical paths of each parallel beam, and are used to combine parallel beams from different directions into a beam that propagates along the same optical axis. The coupling lens is disposed on the transmission optical path of the beam combining, and is used to converge the beam combining and image it onto the receiving surface of the optomechanical system in a critical illumination manner.

2. The beam combining light source device according to claim 1, characterized in that, The condenser lens is used to collect large divergence angle beams emitted by the corresponding monochromatic light source and perform initial focusing, as well as to suppress spherical aberration and coma generated under large numerical aperture conditions. The collimating lens is used to compress the divergence angle of the light beam emitted from the condenser lens and collimate it.

3. The beam combining light source device according to claim 1, characterized in that, Also includes: A large-area camera, wherein the large-area camera is used to image the light spot on the receiving surface; A computer screen, connected to the large-target camera, is used to display a grayscale image of the light spot captured by the large-target camera.

4. The beam combining light source device according to claim 1, characterized in that, The emission module includes a first monochromatic light source, a second monochromatic light source, and a third monochromatic light source. The first monochromatic light source and the second monochromatic light source are light sources with large divergence angles, and the divergence angle of the third monochromatic light source is smaller than that of the first monochromatic light source and the second monochromatic light source. The first monochromatic light source emits light in the invisible light band, while the second and third monochromatic light sources emit light in the visible light band.

5. The beam combining light source device according to claim 4, characterized in that, The second monochromatic light source is placed parallel to the third monochromatic light source, and the first monochromatic light source is placed perpendicular to the second monochromatic light source and the third monochromatic light source.

6. The beam combining light source device according to claim 1, characterized in that, Each color separation film has an anti-reflection coating on its front surface and a color separation coating on its back surface, and each color separation film is set at a 45-degree angle in the optical path.

7. The beam combining light source device according to claim 1, characterized in that, Also includes: The feedback control module includes a photodetector and a PID controller. The photodetector is used to detect the optical power of the combined light in real time and convert it into a voltage value. The PID controller is connected to each monochromatic light source. The PID controller is configured to compare the voltage value with a preset target voltage value, and when the detected voltage value is lower than the preset target voltage value, increase the driving current of the corresponding monochromatic light source to increase the optical power until the voltage value recovers to the preset target voltage value.

8. The beam combining light source device according to claim 7, characterized in that, The feedback control module also includes: The display screen is used to display the actual current values ​​of each monochromatic light source obtained from sampling in real time, so as to observe the stability of the actual current of the LED.

9. The beam combining light source device according to claim 3, characterized in that, Also includes: A debugging controller is connected to the large target camera and each monochromatic light source, and the debugging controller is configured as follows: It supplies power to the LED light source and controls each monochromatic light source to light up individually; Acquire the light spot images formed on the receiving surface by each monochromatic light source captured by the large target camera; Calculate the center coordinates of each light spot based on the grayscale distribution of each light spot image; The beam alignment state of each monochromatic light source is determined based on the deviation between the center coordinates of each light spot.

10. The beam combining light source device according to claim 9, characterized in that, The debug controller is also configured to: Control the illumination of each monochromatic light source in the visible light band, acquire the spot images corresponding to each monochromatic light source in the visible light band, and adjust the beam alignment state of each monochromatic light source in the visible light band based on the deviation between the center coordinates of the spot images corresponding to each monochromatic light source in the visible light band. Control the illumination of the monochromatic light source in the invisible light band, obtain the spot image corresponding to the monochromatic light source in the invisible light band, and adjust the alignment state of the monochromatic light source in the invisible light band and the visible light band combined beam based on the deviation between the center coordinates of the spot image corresponding to the monochromatic light source in the invisible light band and the center coordinates of the aligned visible light band combined beam. Control all monochromatic light sources to light up simultaneously, acquire the combined light spot image captured by the large target camera, and calculate the illumination uniformity of the receiving surface based on the grayscale distribution of the combined light spot image. When the illumination uniformity is lower than a preset threshold, the monochromatic light source path that needs to be adjusted is determined based on the deviation between the center coordinates of each light spot.

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