A device and method for automatically adjusting light beam synthesis

Abstract

The present invention provides an automatic adjustment device and method for beam synthesis. By setting a dichroic mirror that is highly reflective to a beam of a first set wavelength and highly transparent to a beam of a second set wavelength, the optical axis of a first beam of the first set wavelength can be introduced and adjusted so as to complete beam synthesis with a second beam of the second set wavelength; after the two laser beams are combined, a portion of the beam passes through a plane reflector, and then the first beam is disassembled by means of a beam splitter, and the first beam is guided to a fourth optical path by a reflector that is highly reflective to the first set wavelength, and the optical axis pointing error is detected by a first photoelectric sensor, and the angle of the dichroic mirror is adjusted so that the optical axis of the first beam reflected by the dichroic mirror is consistent with the optical axis of the second beam passing through the dichroic mirror, thereby achieving beam synthesis. The present invention can perform real-time detection and adjustment during operation, prevent the problem of optical axis deviation and reduced beam synthesis effect caused by vibration or temperature change during operation, and ensure that the optical axes of the two beams participating in the synthesis are consistent after synthesis.

Description

Technical Field

[0001] The present invention relates to the technical field of light beam synthesis, and in particular to a light beam synthesis automatic adjustment device and method. Background Art

[0002] In the field of lasers, in order to obtain sufficiently high-power lasers, multiple lasers are usually required to synthesize the optical path. There are two common forms: one is to synthesize and focus multiple lasers at a distance from the target to achieve beam synthesis and power superposition; the other is to use a synthesizer to combine two lasers into one laser beam and then hit the target.

[0003] Generally speaking, once the beam control optical path in the laser is debugged, it cannot be adjusted after the system integration is completed. However, due to the mechanical parts in the optical path such as mirror mounts, lenses and other components undergoing vibrations, temperature changes and other processes, a series of changes will occur, causing the originally combined light beams to separate, greatly reducing the destructive performance of the laser.

[0004] In order to recombine light beams that have been separated due to temperature changes or vibrations, it is necessary to detect whether the optical axes of the two light beams are consistent and make adjustments to ensure the beam combining effect. Summary of the invention

[0005] The embodiments of the present invention provide an automatic adjustment device and method for beam synthesis to eliminate or improve one or more defects existing in the prior art and solve the problem of optical axis deviation and reduced beam synthesis effect caused by mechanical component deviation due to vibration and temperature change.

[0006] The technical solution of the present invention is as follows:

[0007] In one aspect, the present invention provides a light beam synthesis automatic adjustment device, comprising:

[0008] A reflective element, the reflective element being highly reflective to a light beam of a first set wavelength, and being used to reflect a first light beam of the first set wavelength along a first optical path;

[0009] A dichroic mirror, wherein the dichroic mirror has high reflection for a light beam of a first set wavelength and high transmission for a light beam of a second set wavelength; the dichroic mirror reflects the first light beam propagating along the first light path to the second light path; the dichroic mirror transmits the second light beam propagating along the second light path, so that the first light beam and the second light beam are combined; the dichroic mirror is arranged on the angle adjustment mechanism;

[0010] A plane reflector, wherein the plane reflector has high reflectivity to the light beams of the first set wavelength and the second set wavelength; the plane reflector reflects the combined first light beam and the second light beam to a third optical path;

[0011] a beam splitter, the beam splitter having high reflection for the light beam of the first set wavelength and high transmission for the light beam of the second set wavelength; the combined first light beam and the second light beam partially penetrate the plane reflector and propagate along the original second light path to the beam splitter; the beam splitter reflects the received first light beam along the fourth light path and transmits the received second light beam; the beam splitter is also used for semi-transmitting and semi-reflecting the standard red light propagating along the second light path, wherein the reflected standard red light propagates along the fourth light path;

[0012] A first focusing lens is arranged on the fourth optical path, and is used to focus the standard red light reflected by the beam splitter onto the first photoelectric sensor for position calibration; the first focusing lens is also used to focus the first light beam reflected by the beam splitter onto the first photoelectric sensor for detection adjustment;

[0013] A second focusing lens is arranged on the second optical path and is used to focus the standard red light passing through the beam splitter onto the second photoelectric sensor for position calibration;

[0014] A control unit is connected to the first photoelectric sensor, the second photoelectric sensor and the angle adjustment mechanism. During the position calibration process, the control unit receives the first light spot center of the standard red light detected by the first photoelectric sensor and the second light spot center of the standard red light detected by the second photoelectric sensor to guide the adjustment of the positions of the first photoelectric sensor and the second photoelectric sensor so that the first light spot center is located at the center of the first photoelectric sensor and the second light spot center is located at the center of the second photoelectric sensor; during the automatic adjustment of the light beam synthesis, the third light spot center of the first light beam focused on the first photoelectric sensor by the first focusing lens is obtained to calculate the optical axis pointing error relative to the center of the first photoelectric sensor according to the third light spot center, and the angle adjustment mechanism is controlled to adjust the angle of the dichroic mirror according to the optical axis pointing error so that the optical axis of the first light beam reflected by the dichroic mirror is consistent with the optical axis of the second light beam passing through the dichroic mirror.

[0015] In some embodiments, the angle adjustment mechanism is a six-legged parallel pointing mechanism, which includes a first platform, a second platform, and six telescopic parts, and both ends of each telescopic part are connected to the first platform and the second platform through a ball joint; the dichroic mirror is fixed on the first platform; the telescopic part is a voice coil motor or an electric push rod.

[0016] In some embodiments, the control unit also detects the center of a fourth light spot generated by the second light beam introduced by the second focusing lens through the second photoelectric sensor, so as to calculate the offset of the optical axis of the second light beam relative to the second optical path based on the center of the fourth light spot, and guide the adjustment of the optical axis of the second light beam.

[0017] In some embodiments, the device further comprises a first attenuation plate and a second attenuation plate, wherein the first attenuation plate is disposed between the first focusing lens and the first photosensor, and the second attenuation plate is disposed between the second focusing lens and the second photosensor.

[0018] In some embodiments, the device further comprises: a wireless communication module, wherein the wireless communication module is connected to the control unit.

[0019] In some embodiments, the device further comprises: a display module, wherein the display module is connected to the control unit to display the optical axis pointing error.

[0020] On the other hand, the present invention further provides a method for automatically adjusting light beam synthesis, which is used to be run on a control unit of the above-mentioned automatic light beam synthesis adjustment device, and the method comprises:

[0021] Acquire a first light spot center to be adjusted of the first light beam focused on the first photoelectric sensor by the first focusing lens;

[0022] Calculating an optical axis pointing error of the center of the first light spot to be adjusted relative to the center of the first photoelectric sensor;

[0023] The angle of the dichroic mirror is adjusted by controlling the angle adjustment mechanism according to the optical axis pointing error, so that the optical axis of the first light beam reflected by the dichroic mirror is consistent with the optical axis of the second light beam passing through the dichroic mirror.

[0024] In some embodiments, before obtaining the center of the first light spot to be adjusted of the first light beam focused by the first focusing lens on the first photosensor, the method further includes:

[0025] Acquire a first light spot center of the standard red light detected by the first photoelectric sensor, and a second light spot center of the standard red light detected by the second photoelectric sensor;

[0026] According to the first light spot center and the second light spot center, the positions of the first photoelectric sensor and the second photoelectric sensor are adjusted so that the first light spot center is located at the center of the first photoelectric sensor and the second light spot center is located at the center of the second photoelectric sensor, thereby completing the calibration of the first photoelectric sensor and the second photoelectric sensor. In some embodiments, the method further includes:

[0027] Acquire the center of the second light spot to be adjusted of the second light beam focused on the second photoelectric sensor by the second focusing lens;

[0028] Calculating an optical axis pointing error of the center of the second light spot to be adjusted relative to the center of the second photoelectric sensor;

[0029] The light axis of the light source of the second light beam is adjusted according to the optical axis pointing error of the center of the second light spot to be adjusted relative to the center of the second photosensor, so that the light axis of the light source of the second light beam is consistent with the second optical path.

[0030] On the other hand, the present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the program.

[0031] The beneficial effects of the present invention are at least:

[0032] In the automatic adjustment device and method for light beam synthesis of the present invention, by setting a dichroic mirror that is highly reflective to a light beam of a first set wavelength and highly transparent to a light beam of a second set wavelength, the optical axis of the first light beam of the first set wavelength can be introduced and adjusted so as to complete beam combination with the second light beam of the second set wavelength; after the two laser beams are combined, a partial beam passes through a plane reflector, and then the first light beam is disassembled by means of a beam splitter, and is led out to the fourth light path by a reflector that is highly reflective to the first set wavelength, and the optical axis pointing error is detected by a first photoelectric sensor, and the angle of the dichroic mirror is adjusted so that the optical axis of the first light beam reflected by the dichroic mirror is consistent with the optical axis of the second light beam that passes through the dichroic mirror, thereby achieving beam combination. The present invention can perform real-time detection and adjustment during operation, and prevent the problem of optical axis deviation and reduced beam combination effect caused by vibration or temperature change during operation.

[0033] Furthermore, the dichroic mirror in the present invention can achieve angle adjustment with multiple degrees of freedom through a hexapod parallel pointing mechanism, and the optical axis correction of the first light beam is more accurate.

[0034] Additional advantages, purposes, and features of the present invention will be described in part in the following description, and will become apparent to those skilled in the art after studying the following, or may be learned from the practice of the present invention. The purposes and other advantages of the present invention may be achieved and obtained by the structures specifically pointed out in the written description, claims, and drawings.

[0035] Those skilled in the art will appreciate that the objectives and advantages that can be achieved with the present invention are not limited to the above specific description, and the above and other objectives that can be achieved by the present invention will be more clearly understood from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute a limitation of the present invention. In the drawings:

[0037] Figure 1 It is a structural schematic diagram of a light beam synthesis automatic adjustment device according to an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the structure of the angle adjustment mechanism in the automatic adjustment device for light beam synthesis according to an embodiment of the present invention;

[0039] Figure 3 The flowchart of the automatic adjustment method for light beam synthesis according to one embodiment of the present invention is a schematic diagram;

[0040] Figure 4 A schematic diagram of a calibration process of a method for automatically adjusting light beam synthesis according to an embodiment of the present invention;

[0041] Figure 5 The figure is a schematic diagram of the process of adjusting the optical axis of the light source of the second light beam according to the automatic adjustment method for light beam synthesis according to an embodiment of the present invention.

[0042] Description of reference numerals:

[0043] 110: reflective element; 120: dichroic mirror; 121: angle adjustment mechanism;

[0044] 1211: first platform; 1212: second platform; 1213: telescopic member;

[0045] 130: plane reflector; 140: beam splitter; 150: first focusing lens;

[0046] 160: second focusing lens; 170: first photoelectric sensor; 180: second photoelectric sensor;

[0047] 190: Control unit. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0049] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0050] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, elements, steps or components, but does not exclude the presence or addition of one or more other features, elements, steps or components.

[0051] It should also be noted that, unless otherwise specified, the term “connection” herein may refer not only to a direct connection but also to an indirect connection involving an intermediate.

[0052] Generally speaking, beam synthesis technology is divided into two categories: coherent synthesis and incoherent synthesis. Coherent synthesis technology requires that each laser sub-beam completely interfere with each other, so it is necessary to accurately match the phases of the output beams from different fiber lasers to form constructive interference to produce high-brightness output. According to the different phase-locking methods, it is generally classified as active and passive. Incoherent synthesis technology is to directly combine the fiber laser array in various ways, without the need for a complex phase control mechanism, which is convenient for expanding the scale of the fiber array and has a simple and stable structure. The present invention is mainly aimed at incoherent synthesis, and therefore requires that the optical axes (center lines of the beams) of the synthesized sub-beams be consistent. The present invention provides an automatic adjustment device and method for beam synthesis to detect and adjust the optical axis offset error in real time.

[0053] Specifically, the present invention provides a light beam synthesis automatic adjustment device, such as Figure 1 As shown, it includes: a reflective element 110, a dichroic mirror 120, a plane reflector 130, a beam splitter 140, a first focusing lens 150, a first photoelectric sensor 170, a second focusing lens 160, a second photoelectric sensor 180 and a control unit 190.

[0054] The reflective element 110 is highly reflective to the light beam of the first set wavelength, and is used to reflect the first light beam of the first set wavelength along the first optical path. The reflective element 110 can be a reflector with a 45-degree total reflection capability for the first set wavelength. In this embodiment, the first light beam is introduced through the reflective element 110. By setting the angle of the reflective element 110, the first light beam can be propagated along the first optical path to the dichroic mirror 120.

[0055] The dichroic mirror 120 has high reflection for the light beam of the first set wavelength and high transmission for the light beam of the second set wavelength; the dichroic mirror 120 reflects the first light beam propagating along the first optical path to the second optical path; the dichroic mirror 120 transmits the second light beam propagating along the second optical path, so that the first light beam and the second light beam are combined; the dichroic mirror 120 is arranged on the angle adjustment mechanism 121. One side of the dichroic mirror 120 reflects the first light beam of the first set wavelength, and the other side transmits the second light beam of the second set wavelength. By adjusting the angle, the first light beam and the second light beam can be combined.

[0056] Specifically, the angle of the dichroic mirror 120 is changed by the angle adjustment mechanism 121. In some embodiments, for example Figure 2As shown, the angle adjustment mechanism 121 is a six-legged parallel pointing mechanism, which includes a first platform 1211, a second platform 1212, and six telescopic members 1213. The two ends of each telescopic member 1213 are respectively connected to the first platform 1211 and the second platform 1212 through a ball joint; the dichroic mirror 120 is fixed on the first platform 1211. In some embodiments, the telescopic member 1213 is a voice coil motor or an electric push rod.

[0057] The second platform 1212 is fixed, and the first platform 1211 is translated along the X, Y, and Z axes and rotated around the X, Y, and Z axes by means of the telescopic member 1213. Generally, the telescopic member 1213 is composed of a servo electric cylinder or a hydraulic cylinder. With the telescopic movement of the six telescopic members 1213, the upper platform is able to move in six degrees of freedom in space.

[0058] The plane reflector 130 has high reflection for both the light beams of the first set wavelength and the second set wavelength; the plane reflector 130 reflects the combined first light beam and the second light beam to the third optical path. The present invention is for incoherent synthesis, and the combined first light beam and the second light beam are directly guided out through the plane reflector 130. In the reflection process of the plane reflector 130, a small part of the light beam passes through the plane reflector 130 and continues to propagate along the original second optical path. This part of the light beam passing through the plane reflector 130 is used to detect whether the optical axis is offset.

[0059] The spectroscope 140 is highly reflective to the light beam of the first set wavelength and highly transparent to the light beam of the second set wavelength; the combined first and second light beams partially penetrate the plane reflector 130 and propagate along the original second optical path to the spectroscope 140; the spectroscope 140 reflects the received first light beam along the fourth optical path and transmits the received second light beam; the spectroscope 140 is also used to semi-transmit and semi-reflect the standard red light propagating along the second optical path, wherein the reflected standard red light propagates along the fourth optical path. It should be noted here that the standard red light is used to calibrate the position of the first photoelectric sensor 170 and the second photoelectric sensor 180, and the calibration process is performed before the actual operation process.

[0060] The first focusing lens 150 is arranged on the fourth optical path, and is used to focus the standard red light reflected by the spectrometer 140 to the first photoelectric sensor 170 for position calibration; the first focusing lens 150 is also used to focus the first light beam reflected by the spectrometer 140 to the first photoelectric sensor 170 for detection adjustment.

[0061] The second focusing lens 160 is arranged on the second optical path, and is used to focus the standard red light transmitted through the beam splitter 140 onto the second photoelectric sensor 180 for position calibration. It should be noted here that the second light beam used for detection is always transmitted in the present device without reflection, so it is always transmitted along the second optical path and will not be offset. Therefore, in this embodiment, the second photoelectric sensor 180 is only used during calibration. In another embodiment, the second photoelectric sensor 180 also detects the second light beam introduced by the second focusing lens 160 to determine whether the second light beam deviates from the second optical path.

[0062] The control unit 190 is connected to the first photoelectric sensor 170, the second photoelectric sensor 180 and the angle adjustment mechanism 121. During the position calibration process, the control unit 190 receives the first light spot center of the standard red light detected by the first photoelectric sensor 170 and the second light spot center of the standard red light detected by the second photoelectric sensor 180 to guide the adjustment of the positions of the first photoelectric sensor 170 and the second photoelectric sensor 180, so that the first light spot center is located at the center of the first photoelectric sensor 170 and the second light spot center is located at the center of the second photoelectric sensor 180, thereby realizing the calibration of the position of the mechanical structure; during the automatic adjustment process of the light beam synthesis, the third light spot center of the first light beam focused on the first photoelectric sensor 170 by the first focusing lens 150 is obtained, so as to calculate the optical axis pointing error relative to the center of the first photoelectric sensor 170 according to the third light spot center, and control the angle adjustment mechanism 121 to adjust the angle of the dichroic mirror 120 according to the optical axis pointing error, so that the optical axis of the first light beam reflected by the dichroic mirror 120 is consistent with the optical axis of the second light beam passing through the dichroic mirror 120. In other embodiments, the control unit 190 also detects the center of the fourth light spot generated by the second light beam introduced by the second focusing lens 160 through the second photoelectric sensor 180, so as to calculate the offset of the optical axis of the second light beam relative to the second optical path based on the center of the fourth light spot, and guide the adjustment of the optical axis of the second light beam.

[0063] In some embodiments, the device further includes a first attenuation sheet and a second attenuation sheet, wherein the first attenuation sheet is disposed between the first focusing lens 150 and the first photoelectric sensor 170, and the second attenuation sheet is disposed between the second focusing lens 160 and the second photoelectric sensor 180. In this embodiment, the light intensity is adjusted by adding the first attenuation sheet and the second attenuation sheet to ensure the effectiveness and accuracy of the detection.

[0064] In some embodiments, the device further comprises: a wireless communication module connected to the control unit 190 to remotely broadcast the detection results and adjustment process during the beam combining process, or remotely receive control instructions to start, stop and adjust the device.

[0065] In some embodiments, the device further includes: a display module, the display module is connected to the control unit 190 to display the optical axis pointing error.

[0066] On the other hand, the present invention also provides a method for automatically adjusting beam synthesis, which is used to run on the control unit 190 of the above-mentioned automatic beam synthesis adjustment device, such as Figure 3 As shown, the method includes steps S101 to S103:

[0067] Step S101 : acquiring the center of a first light spot to be adjusted of a first light beam focused on a first photosensor 170 by a first focusing lens 150 .

[0068] Step S102: Calculate the optical axis pointing error of the center of the first light spot to be adjusted relative to the center of the first photoelectric sensor 170 .

[0069] Step S103 : controlling the angle adjustment mechanism 121 to adjust the angle of the dichroic mirror 120 according to the optical axis pointing error, so that the optical axis of the first light beam reflected by the dichroic mirror 120 is consistent with the optical axis of the second light beam passing through the dichroic mirror 120 .

[0070] In steps S101 to S103 of this embodiment, based on the structure of the above-mentioned automatic adjustment device for beam synthesis, it can be clearly seen that the second light beam finally detected by the second photoelectric sensor 180 is always transmitted and propagated in the second light path, so its direction does not change when it is transmitted along the second path. Therefore, in fact, in the process of combining laser beams by the above-mentioned automatic adjustment device for beam synthesis, the second light path is used as a reference and does not change. The main influence is the optical axis deviation of the first light beam caused by the unstable mechanical structure of the dichroic mirror 120. Therefore, in the actual operation process, the first light beam is mainly detected.

[0071] Specifically, the first light beam is reflected by the reflective element 110 to the dichroic mirror 120, and then reflected by the dichroic mirror 120 and propagated along the second optical path. The second light beam is propagated along the second optical path through the dichroic mirror 120, and the optical axes of the first light beam and the second light beam are consistent to achieve beam combination. In the actual operation process, the dichroic mirror 120 may be offset due to vibration and temperature change, which will cause the optical axis of the first light beam to shift during the reflection process. Therefore, it is necessary to detect the first light beam after beam combination. In this embodiment, most of the laser reflection after beam combination is exported through the reflector, and a small part is used for detection after passing through the reflector. Further, the beam splitter 140 splits part of the laser beam passing through the plane reflector 130 into a first light beam and a second light beam, wherein the first light beam is reflected to the first focusing lens 150, and the second light beam is transmitted to the second focusing lens 160. The optical path of the second light beam does not change, so it is only necessary to detect the optical axis offset of the first light beam.

[0072] The first light beam focused by the first focusing lens 150 and projected onto the first photoelectric sensor 170 forms a light spot to be adjusted. Ideally, when the dichroic mirror 120 is not offset, the light spot to be adjusted should be at the center of the first photoelectric sensor 170. If offset occurs, the optical axis pointing error can be detected, that is, the offset of the light spot to be adjusted relative to the center of the first photoelectric sensor 170. The optical axis pointing error can be used to guide the adjustment of the angle of the dichroic mirror 120. Specifically, multiple detection feedback and adjustment methods can be used, or the angle adjustment amount can be directly calculated based on the optical axis pointing error and adjusted at one time.

[0073] In some embodiments, Figure 4 As shown, before step S101, before obtaining the center of the first light spot to be adjusted of the first light beam focused by the first focusing lens 150 on the first photoelectric sensor 170, steps S201 to S202 are also included:

[0074] Step S201 : acquiring a first light spot center of the standard red light detected by the first photoelectric sensor 170 and a second light spot center of the standard red light detected by the second photoelectric sensor 180 .

[0075] Step S202: Adjust the positions of the first photoelectric sensor 170 and the second photoelectric sensor 180 according to the first light spot center and the second light spot center, so that the first light spot center is located at the center of the first photoelectric sensor 170 and the second light spot center is located at the center of the second photoelectric sensor 180, thereby completing the calibration of the first photoelectric sensor 170 and the second photoelectric sensor 180.

[0076] Steps S201 to S202 are actually to calibrate the positions of the first photoelectric sensor 170 and the second photoelectric sensor 180 before the formal beam combining operation. Since a single standard red light is used, it has only one path before reaching the beam splitter 140. At this time, the two sub-beams formed based on the semi-transmissive and semi-reflective effect of the beam splitter 140 can simulate the positions of the light spots formed on the first photoelectric sensor 170 and the second photoelectric sensor 180 when the first and second light beams have the same optical axes. The positions of the first photoelectric sensor 170 and the second photoelectric sensor 180 are adjusted so that the light spots of the standard red light are at the centers of the first photoelectric sensor 170 and the second photoelectric sensor 180 as the standard positions.

[0077] In other embodiments, Figure 5 As shown, the method further includes steps S301 to S303:

[0078] Step S301 : acquiring the center of a second light spot to be adjusted of a second light beam on a second photoelectric sensor 180 by the second focusing lens 160 .

[0079] Step S302: Calculate the optical axis pointing error of the center of the second light spot to be adjusted relative to the center of the second photoelectric sensor 180 .

[0080] Step S303: adjusting the light axis of the second light beam according to the optical axis pointing error of the center of the second light spot to be adjusted relative to the center of the second photoelectric sensor 180, so that the light axis of the second light beam is consistent with the second optical path.

[0081] On the other hand, the present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the program.

[0082] On the other hand, the present invention also provides a computer-readable storage medium having a computer program stored thereon, characterized in that the program implements the steps of the above method when executed by a processor.

[0083] The present invention is described below in conjunction with a specific embodiment:

[0084] This embodiment provides a device for automatically adjusting light beam synthesis, such as Figure 1 As shown, the optical path diagram of the device includes: a reflective element 110, a dichroic mirror 120, a high-reflection plane reflector 130, a beam splitter 140, a first focusing lens 150, a second focusing lens 160, a first photoelectric sensor 170, a second photoelectric sensor 180, and a control unit 190. Among them, an attenuation plate can be added between the beam splitter 140 and the first focusing lens 150, and between the beam splitter 140 and the second focusing lens 160 as appropriate.

[0085] The laser beam with wavelength λ1 is incident horizontally, reflected by the reflective element 110, and hits the dichroic mirror 120. The dichroic mirror 120 has high reflection for the laser beam with wavelength λ1; the laser beam with wavelength λ2 is incident horizontally through the dichroic mirror 120. The dichroic mirror 120 has high transparency for the laser beam with wavelength λ2. The dichroic mirror 120 is mounted on a mirror seat with adjustable posture. The synthesized laser beam passes through a plane reflector 130 with high reflection for both λ1 and λ2. At this time, a small part of the light will be transmitted through the plane reflector 130 and the beam splitter 140. The beam splitter 140 has high reflection for the laser beam with wavelength λ1 and high transparency for the laser beam with wavelength λ2. The two separated laser beams pass through the attenuation plate, the first focusing lens 150 and the second focusing lens 160 respectively, and are shot into the first photoelectric sensor 170 and the second photoelectric sensor 180, so as to obtain the optical axis pointing errors of the two light beams involved in the synthesis.

[0086] The control unit adjusts the posture of the synthesis mirror according to the adjustment amount calculated based on the aforementioned pointing error, thereby correcting the optical axis pointing error of the two beams in the synthetic light beam to form a closed-loop stability.

[0087] Specifically, this embodiment discloses a method for automatically adjusting light beam synthesis, the method comprising the following steps:

[0088] 1) Sampling the synthetic light beam by a sampling optical path to obtain a sampling light beam.

[0089] 2) The sampling light beam is measured by the detection optical path to obtain the optical axis pointing errors of the two light beams involved in the synthesis.

[0090] 3) The calculation unit calculates the adjustment amount of each actuator according to the aforementioned pointing error. The actuator is a plurality of telescopic parts on the mirror base for adjusting the sub-state, which can be a voice coil motor, piezoelectric ceramics or electric push rod.

[0091] 4) Each actuator in the actuator moves according to the aforementioned adjustment amount to adjust the posture of the synthetic mirror, thereby correcting the optical axis pointing error of the two beams in the synthetic light beam to form a closed-loop stability.

[0092] The sampling optical path uses a high-reflectivity plane mirror, and its transmitted light is used as the sampling beam; the detection optical path uses a beam splitter to separate the two beams of light with different wavelengths in the composite beam, and then pass through the first focusing lens and the second focusing lens respectively, and enter the first photodetector and the second photodetector. An attenuator can be inserted in the detection optical path to adjust the light intensity incident on the photodetector.

[0093] This embodiment includes the following advantages: by using an automatically adjustable synthesis mirror in the beam control part of the laser system, the synthesis light path can be adjusted in real time to ensure that the optical axes of the two beams involved in the synthesis remain consistent after synthesis, so that the destructive efficiency of the laser is maximized. It has a simple structure, is easy to operate, and has strong application value.

[0094] In summary, in the automatic adjustment device and method for light beam synthesis of the present invention, by setting a dichroic mirror that is highly reflective to the light beam of the first set wavelength and highly transparent to the light beam of the second set wavelength, the optical axis of the first light beam of the first set wavelength can be introduced and adjusted, so that it can be combined with the second light beam of the second set wavelength; after the two laser beams are combined, the partial light beam passes through the plane reflector, and then the first light beam is disassembled by means of a beam splitter, and is guided to the fourth light path by the reflector that is highly reflective to the first set wavelength, and the optical axis pointing error is detected by the first photoelectric sensor, and the angle of the dichroic mirror is adjusted, so that the optical axis of the first light beam reflected by the dichroic mirror is consistent with the optical axis of the second light beam passing through the dichroic mirror, so as to achieve beam combination. The present invention can perform real-time detection and adjustment during operation, and prevent the problem of optical axis deviation and reduced beam combination effect caused by vibration or temperature change during operation.

[0095] Furthermore, the dichroic mirror in the present invention can achieve angle adjustment with multiple degrees of freedom through a hexapod parallel pointing mechanism, and the optical axis correction of the first light beam is more accurate.

[0096] It should be understood by those skilled in the art that the exemplary components, systems and methods described in conjunction with the embodiments disclosed herein can be implemented in hardware, software or a combination of the two. Whether it is performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present invention are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium or transmitted on a transmission medium or a communication link via a data signal carried in a carrier. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, and the like. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0097] It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in a different order from the embodiments, or several steps can be performed simultaneously.

[0098] In the present invention, features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, and / or combined with features of other embodiments or replace features of other embodiments.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A beam synthesis automatic adjustment device, characterized in that: include: A reflective element, the reflective element being highly reflective to a light beam of a first set wavelength, and being used to reflect a first light beam of the first set wavelength along a first optical path; A dichroic mirror, wherein the dichroic mirror has high reflection for a light beam of a first set wavelength and high transmission for a light beam of a second set wavelength; the dichroic mirror reflects the first light beam propagating along the first light path to the second light path; the dichroic mirror transmits the second light beam propagating along the second light path, so that the first light beam and the second light beam are combined; the dichroic mirror is arranged on the angle adjustment mechanism; A plane reflector, wherein the plane reflector has high reflectivity to the light beams of the first set wavelength and the second set wavelength; the plane reflector reflects the combined first light beam and the second light beam to a third optical path; a beam splitter, the beam splitter having high reflection for the light beam of the first set wavelength and high transmission for the light beam of the second set wavelength; the combined first light beam and the second light beam partially penetrate the plane reflector and propagate along the original second light path to the beam splitter; the beam splitter reflects the received first light beam along the fourth light path and transmits the received second light beam; the beam splitter is also used for semi-transmitting and semi-reflecting the standard red light propagating along the second light path, wherein the reflected standard red light propagates along the fourth light path; A first focusing lens is arranged on the fourth optical path, and is used to focus the standard red light reflected by the beam splitter onto the first photoelectric sensor for position calibration; the first focusing lens is also used to focus the first light beam reflected by the beam splitter onto the first photoelectric sensor for detection adjustment; A second focusing lens is arranged on the second optical path and is used to focus the standard red light passing through the beam splitter onto the second photoelectric sensor for position calibration; A control unit is connected to the first photoelectric sensor, the second photoelectric sensor and the angle adjustment mechanism. During the position calibration process, the control unit receives the first light spot center of the standard red light detected by the first photoelectric sensor and the second light spot center of the standard red light detected by the second photoelectric sensor to guide the adjustment of the positions of the first photoelectric sensor and the second photoelectric sensor so that the first light spot center is located at the center of the first photoelectric sensor and the second light spot center is located at the center of the second photoelectric sensor; during the automatic adjustment of the light beam synthesis, the third light spot center of the first light beam focused on the first photoelectric sensor by the first focusing lens is obtained to calculate the optical axis pointing error relative to the center of the first photoelectric sensor according to the third light spot center, and the angle adjustment mechanism is controlled to adjust the angle of the dichroic mirror according to the optical axis pointing error so that the optical axis of the first light beam reflected by the dichroic mirror is consistent with the optical axis of the second light beam passing through the dichroic mirror.

2. The automatic beam synthesis adjustment device according to claim 1, characterized in that: The angle adjustment mechanism is a six-legged parallel pointing mechanism, which includes a first platform, a second platform, and six telescopic parts, and both ends of each telescopic part are connected to the first platform and the second platform through a ball joint; the dichroic mirror is fixed on the first platform; the telescopic part is a voice coil motor or an electric push rod.

3. The automatic beam synthesis adjustment device according to claim 2, characterized in that: The control unit also detects the center of the fourth light spot generated by the second light beam introduced by the second focusing lens through the second photoelectric sensor, so as to calculate the offset of the optical axis of the second light beam relative to the second optical path according to the center of the fourth light spot, and guide the adjustment of the optical axis of the second light beam.

4. The automatic beam synthesis adjustment device according to claim 1, characterized in that: The device further comprises a first attenuation plate and a second attenuation plate, wherein the first attenuation plate is arranged between the first focusing lens and the first photosensor, and the second attenuation plate is arranged between the second focusing lens and the second photosensor.

5. The automatic beam synthesis adjustment device according to claim 1, characterized in that: The device further comprises: a wireless communication module, wherein the wireless communication module is connected to the control unit.

6. The automatic beam synthesis adjustment device according to claim 5, characterized in that: The device further comprises: a display module, wherein the display module is connected to the control unit to display the optical axis pointing error.

7. A method for automatically adjusting light beam synthesis, characterized in that: The method is used to be run on a control unit of the light beam synthesis automatic adjustment device according to any one of claims 1 to 6, and the method comprises: Acquire a first light spot center to be adjusted of the first light beam focused on the first photoelectric sensor by the first focusing lens; Calculating an optical axis pointing error of the center of the first light spot to be adjusted relative to the center of the first photoelectric sensor; The angle adjustment mechanism is controlled to adjust the angle of the dichroic mirror according to the optical axis pointing error of the center of the first light spot to be adjusted relative to the center of the first photoelectric sensor, so that the optical axis of the first light beam reflected by the dichroic mirror is consistent with the optical axis of the second light beam passing through the dichroic mirror.

8. The method for automatically adjusting light beam synthesis according to claim 7, characterized in that: Before obtaining the center of the first light spot to be adjusted of the first light beam focused by the first focusing lens on the first photoelectric sensor, the method further includes: Acquire a first light spot center of the standard red light detected by the first photoelectric sensor, and a second light spot center of the standard red light detected by the second photoelectric sensor; The positions of the first photoelectric sensor and the second photoelectric sensor are adjusted according to the first light spot center and the second light spot center, so that the first light spot center is located at the center of the first photoelectric sensor and the second light spot center is located at the center of the second photoelectric sensor, thereby completing the calibration of the first photoelectric sensor and the second photoelectric sensor.

9. The method for automatically adjusting light beam synthesis according to claim 7, characterized in that: The method further comprises: Acquire the center of the second light spot to be adjusted of the second light beam focused on the second photoelectric sensor by the second focusing lens; Calculating an optical axis pointing error of the center of the second light spot to be adjusted relative to the center of the second photoelectric sensor; The light axis of the light source of the second light beam is adjusted according to the optical axis pointing error of the center of the second light spot to be adjusted relative to the center of the second photosensor, so that the light axis of the light source of the second light beam is consistent with the second optical path.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method according to any one of claims 7 to 9 are implemented.

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