CN111585155A - Composite laser system - Google Patents
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- CN111585155A CN111585155A CN202010423577.9A CN202010423577A CN111585155A CN 111585155 A CN111585155 A CN 111585155A CN 202010423577 A CN202010423577 A CN 202010423577A CN 111585155 A CN111585155 A CN 111585155A
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- 239000002131 composite material Substances 0.000 title claims abstract description 53
- 239000013307 optical fiber Substances 0.000 claims abstract description 91
- 230000008878 coupling Effects 0.000 claims abstract description 12
- 238000010168 coupling process Methods 0.000 claims abstract description 12
- 238000005859 coupling reaction Methods 0.000 claims abstract description 12
- 239000004065 semiconductor Substances 0.000 claims description 18
- 239000000835 fiber Substances 0.000 claims description 12
- 238000002834 transmittance Methods 0.000 claims description 9
- 238000002310 reflectometry Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 abstract description 9
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 238000003786 synthesis reaction Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000004927 fusion Effects 0.000 abstract description 3
- 230000010354 integration Effects 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 150000002739 metals Chemical class 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0071—Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
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- Engineering & Computer Science (AREA)
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- Optics & Photonics (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a composite laser system which comprises a first laser source, a second laser source, a master control device, a first collimating lens group, a second collimating lens group, a beam combination grating, a focusing lens group, a coupling output head, a first optical fiber, a second optical fiber and a third optical fiber. According to the composite laser system provided by the invention, the laser output head is adopted to output the light beam composited into one beam through one channel, so that the processing flexibility is improved, the model selection and design of the laser processing head are simplified, and the characteristics of the light spot of the composite light beam are more stable. The invention has the characteristics of high power, single-head output, high integration degree, strong processing capability and the like, not only avoids the trouble and risk of synthesis by using an external laser processing head, but also has simple operation, and can obtain composite laser output by only one output head; meanwhile, the synthesized laser takes the processing characteristics of the two lasers into consideration, and is beneficial to complex welding of dissimilar metals, thick plates, large fusion depth, high strength and high quality.
Description
Technical Field
The invention relates to the technical field of laser synthesis, in particular to a composite laser system.
Background
With the continuous expansion and deepening of laser processing application, the application of laser on cutting is becoming mature. However, in the field of laser welding, the complicated and diversified welding process also puts higher demands on the performance of the processing light source, and further, the shape of the laser processing light source is required to be diversified. The composite laser light source has wide application range due to unique advantages, and can adapt to special and complicated welding requirements.
Regarding the production and processing application of the composite laser light source, it is common to use a composite laser welding head to combine two beams of light beams with relatively large differences in quality, power, wavelength, etc. output by two laser output heads, and then apply the combined beams to a processing workpiece to complete the welding application. However, the existing composite laser light source is troublesome in a scheme of synthesizing by using two external laser processing heads, the processing flexibility is not high enough, the obtained composite laser is not stable enough, and the safety risk exists.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a composite laser system.
In order to achieve the purpose, the invention adopts the technical scheme that:
a composite laser system comprises a first laser source, a second laser source, a master control device, a first collimating lens group, a second collimating lens group, a beam combining grating, a focusing lens group, a coupling output head, a first optical fiber, a second optical fiber and a third optical fiber;
the master control device is electrically connected with the first laser source and the second laser source respectively;
the output ends of the first laser source and the second laser source are respectively connected with the input ends of the first optical fiber and the second optical fiber;
the first collimating lens group, the second collimating lens group, the beam combination grating and the focusing lens group are all arranged in a laser path; the input ends of the first collimating lens group and the second collimating lens group respectively face the output ends of the first optical fiber and the second optical fiber; the output end of the focusing lens group is opposite to the input end of the third optical fiber; the output end of the third optical fiber is connected with the coupling output head;
the master control device is used for controlling the first laser source and the second laser source to output laser to the first optical fiber and the second optical fiber respectively;
the first collimating lens group and the second collimating lens group are respectively used for collimating the laser output by the first optical fiber and the second optical fiber and outputting the collimated laser to the beam combining body grating;
the beam combining body grating is used for combining the collimated laser beams respectively output by the first collimating lens group and the second collimating lens group into a beam of composite laser beam and outputting the composite laser beam to the focusing lens group;
and the focusing lens group is used for focusing the composite laser output by the beam combining body grating, transmitting the composite laser to the input end of the third optical fiber, and outputting the composite laser through a coupling output head positioned at the output end of the third optical fiber.
In some embodiments, the first laser source is a semiconductor laser;
the second laser source is a fiber laser.
In some embodiments, the first laser source has an output power between 500W and 4000W and a beam mass between 5mm mrad and 100mm mrad;
the output power of the second laser source is 500W-5000W, and the beam quality is 0.4mm mrad-4 mm mrad.
In some embodiments, the first optical fiber has a core diameter between 100 and 1000 μm;
the core diameter of the second optical fiber is 20-100 μm.
In some embodiments, the output wavelength of the first laser source is between 900nm and 1000 nm;
the output wavelength of the second laser source is 1050 nm-1100 nm.
In some embodiments, a first antireflection film is arranged on the output end face of the first optical fiber, and the first antireflection film has a transmittance of more than 99.8% for laser light with a wavelength of 900nm to 1000nm and a reflectance of more than 98% for laser light with a wavelength of 1050nm to 1100 nm;
and a second antireflection film is arranged on the output end face of the second optical fiber, and the second antireflection film has a transmittance of more than 99.8% for laser with a wavelength of 1050-1100 nm and a reflectivity of more than 98% for laser with a wavelength of 900-1000 nm.
In some embodiments, antireflection films with the same parameters as the first antireflection film are disposed on all the collimating lens pieces included in the first collimating lens group;
and all the collimating lens pieces contained in the second collimating lens group are provided with antireflection films with the same parameters as the second antireflection film.
In some embodiments, the combining efficiency of the beam combining volume grating is greater than 99%;
the diameter of the laser beam focused by the focusing lens group is 200-1200 mu m, and the focused laser focus is positioned on the end face of the input end of the third optical fiber;
the core diameter of the third optical fiber is 200-1200 mu m.
In some embodiments, a third antireflection film is disposed on the input end face of the third optical fiber, and the third antireflection film has a transmittance of greater than 99.5% for laser light having a wavelength of 900nm to 1100 nm.
In some embodiments, a temperature detector and a photoelectric detector are further disposed on the third optical fiber, and both the temperature detector and the photoelectric detector are electrically connected to the master control device, and are respectively used for detecting a temperature signal and a photoelectric signal on the third optical fiber and transmitting the detected temperature signal and photoelectric signal to the master control device;
when the temperature signal detected by the temperature detector is greater than a preset threshold value or the photoelectric signal detected by the photoelectric detector is 0, the master control device closes the first laser source and the second laser source.
Compared with the prior art, the invention has the advantages that:
(1) the laser output head is adopted to output the light beam compounded into one beam through one channel, so that the processing flexibility is improved, the model selection and design of the laser processing head are simplified, and the characteristics of the light spot of the compounded light beam are more stable;
(2) the method has the characteristics of high power, single-head output, high integration degree, strong processing capability and the like;
(3) the trouble and risk of synthesizing by using an external laser processing head are avoided;
(4) the operation is simple, and the composite laser output can be obtained by only one output head;
(5) the synthesized laser combines the processing characteristics of the two lasers, and is beneficial to complex welding of dissimilar metals, thick plates, large fusion depth, high strength and high quality.
Drawings
Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.
FIG. 1 is a schematic diagram of a composite laser system provided by the present invention;
description of reference numerals:
1. a first laser source; 2. a second laser source; 3. a master control device; 4. a first collimating lens group; 5. a second collimating lens group; 6. combining the beam body grating; 7. a focusing lens group; 8. a temperature detector; 9. a photodetector; 10. coupling the output head; 11. a first optical fiber; 12. a second optical fiber; 13. a third optical fiber.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
Referring to fig. 1, the present invention provides a composite laser system, which includes a first laser source 1, a second laser source 2, a master control device 3, a first collimating lens group 4, a second collimating lens group 5, a beam combining grating 6, a focusing lens group 7, a coupling output head 10, a first optical fiber 11, a second optical fiber 12, and a third optical fiber 13.
The master control device 3 is respectively and electrically connected with the first laser source 1 and the second laser source 2; the output ends of the first laser source 1 and the second laser source 2 are respectively connected with a first optical fiber 11 and a second optical fiber 12; the first collimating lens group 4, the second collimating lens group 5, the beam combining grating 6 and the focusing lens group 7 are all arranged in a laser path; the input ends of the first collimating lens group 4 and the second collimating lens group 5 respectively face the output ends of the first optical fiber 11 and the second optical fiber 12; the input end of the third optical fiber 13 is opposite to the output end of the focusing lens group 7; a coupling output stub 10 is provided at the output end of the third optical fibre 13.
Further, the general control device 3 may adopt an existing joint general control board card, for example, a control board card with model number PMAC2A/104-2P (ACC-2P) may be adopted, and is used for controlling the first laser source 1 and the second laser source 2 to output laser to the first optical fiber 11 and the second optical fiber 12, respectively; the first collimating lens group 4 and the second collimating lens group 5 are respectively used for collimating the laser output by the first optical fiber 11 and the second optical fiber 12 and outputting collimated laser; the beam combining body grating 6 is used for combining the collimated lasers output by the first collimating lens group 4 and the second collimating lens group 5 into a beam of composite laser; and the focusing lens group 7 is used for focusing the composite laser output by the beam combiner grating 6, transmitting the focused composite laser to the input end of the third optical fiber 13, and outputting the composite laser through a coupling output head 10 positioned at the output end of the third optical fiber 13.
It is understood that in fig. 1, only one lens is drawn for the first collimating lens group 4, the second collimating lens group 5 and the focusing lens group 7 to represent, respectively, but in practice, the first collimating lens group 4, the second collimating lens group 5 and the focusing lens group 7 are all lens groups composed of several lenses; in addition, the mode shown in fig. 1 is not necessarily required when the laser light enters and exits the beam combining grating 6, and the beam combining grating 6 may be sufficient to combine two laser beams into one beam.
In one embodiment, the first laser light source 1 is a semiconductor laser, outputting semiconductor laser light; the second laser source 2 is a fiber laser and outputs fiber laser; the laser beams output by the semiconductor laser and the optical fiber laser are synthesized into a laser beam and output by one laser head, and then the composite laser beam can be obtained.
Specifically, the semiconductor laser outputs semiconductor laser, the output power is 500W-4000W, the beam quality (BPP) is 5mm mrad-100 mm mrad, and the output wavelength is 900 nm-1000 nm; the input end of the first optical fiber 11 is fixed at the output joint of the semiconductor laser, the core diameter of the first optical fiber 11 is 100-1000 μm, and the end face of the output end is plated with a first antireflection film; the first antireflection film has a transmittance of more than 99.8% for laser with a wavelength of 900 nm-1000 nm and a reflectivity of more than 98% for laser with a wavelength of 1050 nm-1100 nm; the high reflectivity between 1050nm and 1100nm is used for preventing the returned fiber laser from damaging the semiconductor laser during processing; the semiconductor laser is diverged after being output from the output end of the first optical fiber 11, enters the first collimating lens group 4, and is collimated and output, wherein all lenses of the first collimating lens group 4 are coated with antireflection films with the same parameters as the first antireflection film; the collimated output semiconductor laser acts on the beam combining body grating 6.
In addition, the fiber laser outputs fiber laser, the output power is 500W-5000W, the beam quality (BPP) is 0.4mm mrad-4 mm mrad, and the output wavelength is 1050 nm-1100 nm; the input end of the second optical fiber 12 is fixed at the output joint of the optical fiber laser, the core diameter of the second optical fiber 12 is 20-100 mu m, and the end face of the output end is plated with a second antireflection film; the second antireflection film has a transmittance of more than 99.8% for laser with a wavelength of 1050-1100 nm and a reflectivity of more than 98% for laser with a wavelength of 900-1000 nm; wherein, the high reflectivity between 900nm and 1000nm is used for preventing the semiconductor laser returning during processing from damaging the optical fiber laser; the fiber laser is diverged after being output from the output end of the second optical fiber 12, enters the second collimating lens group 5, and is collimated and output, wherein all lenses of the second collimating lens group 5 are coated with antireflection films with the same parameters as the second antireflection film; the fiber laser output after collimation acts on the beam combining body grating 6.
Further, the semiconductor laser and the fiber laser after collimation output are subjected to spectrum and energy synthesis on the beam combining body grating 6 to obtain a composite beam, wherein the synthesis efficiency is greater than 99%, and the energy loss is less than 1%; focusing the synthesized laser through a focusing lens group 7, controlling the diameter of the composite beam to be 200-1200 mu m, and enabling the synthesized laser focus to be just positioned on the input end face of the third optical fiber 13; the core diameter of the third optical fiber 13 is 200-1200 mu m, so that the diameter of the composite beam is always consistent with that of the third optical fiber 13; the input end face of the third optical fiber 13 is plated with a third antireflection film, and the third antireflection film keeps a transmittance of more than 99.5% in a range of 900-1100 nm, so that the loss of the synthesized composite laser in transmission is ensured to be as small as possible; the synthesized composite laser is finally output through the coupling output head 10 and can be used for welding a workpiece.
And, a temperature detector 8 and a photoelectric detector 9 are arranged on the third optical fiber 13, and detection signals of the two detectors are input to the master control device 3 to be processed in a unified manner. The temperature detector 8 is used for detecting the temperature on the third optical fiber 13 during laser processing, and when the detected temperature is higher than 60 ℃, the master control device 3 closes the semiconductor laser source and the optical fiber laser source so as to protect the whole composite laser system; the photoelectric detector 9 is used for detecting a photoelectric signal on the third optical fiber 13 during laser processing, and when the detected photoelectric signal is zero, the master control device 3 turns off the semiconductor laser source and the optical fiber laser source to protect the whole composite laser system.
In one embodiment, the power of the semiconductor laser source is 2000W, the beam quality is 30mm x mrad, the central wavelength of the output laser is 915nm, and the core diameter of the first optical fiber 11 is 400 μm; the power of the optical fiber laser source is 3000W, the beam mass is 1.2mm x mrad, the central wavelength of the output laser is 1080nm, and the core diameter of the second optical fiber 12 is 50 micrometers; the core diameter of the third optical fiber 13 is 500 μm; then, on the spot at the waist of the composite laser beam obtained under full power output, the central area is the fiber laser with higher power density, and the boundary area is the semiconductor laser, the interface between the fiber laser and the semiconductor laser is more obvious, and the contrast intensity is stronger.
In summary, the composite laser system provided by the invention adopts a laser output head to output a beam combined into a beam through one channel, so that the processing flexibility is improved, the model selection and design of the laser processing head are simplified, and the characteristics of the light spot of the composite beam are more stable; the laser processing device has the characteristics of high power, single-head output, high integration degree, strong processing capability and the like, avoids the trouble and risk of synthesis by using an external laser processing head, is simple to operate, and can obtain composite laser output by one output head; the synthetic laser combines the processing characteristics of two lasers, and is beneficial to complex welding of dissimilar metals and thick plates with large fusion depth, high strength and high quality.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A composite laser system is characterized by comprising a first laser source (1), a second laser source (2), a master control device (3), a first collimating lens group (4), a second collimating lens group (5), a beam combining grating (6), a focusing lens group (7), a coupling output head (10), a first optical fiber (11), a second optical fiber (12) and a third optical fiber (13);
the master control device (3) is electrically connected with the first laser source (1) and the second laser source (2) respectively;
the output ends of the first laser source (1) and the second laser source (2) are respectively connected with the input ends of a first optical fiber (11) and a second optical fiber (12);
the first collimating lens group (4), the second collimating lens group (5), the beam combining grating (6) and the focusing lens group (7) are all arranged in a laser path; the input ends of the first collimating lens group (4) and the second collimating lens group (5) respectively face the output ends of the first optical fiber (11) and the second optical fiber (12); the output end of the focusing lens group (7) is opposite to the input end of the third optical fiber (13); the output end of the third optical fiber (13) is connected with the coupling output head (10);
the master control device (3) is used for controlling the first laser source (1) and the second laser source (2) to output laser to the first optical fiber (11) and the second optical fiber (12) respectively;
the first collimating lens group (4) and the second collimating lens group (5) are respectively used for collimating the laser output by the first optical fiber (11) and the second optical fiber (12) and outputting collimated laser to the beam combining body grating (6);
the beam combining body grating (6) is used for combining the collimated laser beams output by the first collimating lens group (4) and the second collimating lens group (5) into a beam of composite laser beam and outputting the composite laser beam to the focusing lens group (7);
and the focusing lens group (7) is used for focusing the composite laser output by the beam combining body grating (6), transmitting the composite laser to the input end of the third optical fiber (13), and outputting the composite laser through a coupling output head (10) positioned at the output end of the third optical fiber (13).
2. The composite laser system according to claim 1, wherein the first laser source (1) is a semiconductor laser; the second laser source (2) is a fiber laser.
3. The composite laser system according to claim 2, wherein the output power of the first laser source (1) is between 500W and 4000W, the beam quality is between 5mm mrad and 100mm mrad;
the output power of the second laser source (2) is 500W-5000W, and the beam quality is 0.4mm mrad-4 mm mrad.
4. The composite laser system according to claim 2, wherein the core diameter of the first optical fiber (11) is between 100 and 1000 μm; the core diameter of the second optical fiber (11) is 20-100 μm.
5. The composite laser system according to claim 2, wherein the output wavelength of the first laser source (1) is between 900nm and 1000 nm; the output wavelength of the second laser source (2) is 1050 nm-1100 nm.
6. The composite laser system according to claim 5, wherein a first antireflection film is provided on an output facet of the first optical fiber (11), and the first antireflection film has a transmittance of more than 99.8% for laser light having a wavelength of 900nm to 1000nm and a reflectance of more than 98% for laser light having a wavelength of 1050nm to 1100 nm;
and a second antireflection film is arranged on the output end face of the second optical fiber (12), and the second antireflection film has a transmittance of more than 99.8% for laser with a wavelength of 1050-1100 nm and a reflectivity of more than 98% for laser with a wavelength of 900-1000 nm.
7. The composite laser system according to claim 6, wherein an antireflection film having the same parameters as the first antireflection film is disposed on all the collimating lens pieces included in the first collimating lens group (4);
and all the collimating lens pieces contained in the second collimating lens group (5) are provided with antireflection films with the same parameters as the second antireflection film.
8. The composite laser system according to any of claims 5-7, wherein the combined efficiency of the beam combining volume grating (6) is greater than 99%;
the diameter of the laser beam focused by the focusing lens group (7) is 200-1200 mu m, and the focused laser focus is positioned on the end face of the input end of the third optical fiber (13);
the core diameter of the third optical fiber (13) is 200-1200 mu m.
9. The composite laser system according to claim 8, wherein a third antireflection film is provided on the input facet of the third optical fiber (13), and the third antireflection film has a transmittance of more than 99.5% for laser light having a wavelength of 900nm to 1100 nm.
10. The composite laser system according to claim 1, wherein a temperature detector (8) and a photodetector (9) are further disposed on the third optical fiber (13), and both the temperature detector (8) and the photodetector (9) are electrically connected to the master control device (3) and are respectively used for detecting a temperature signal and a photoelectric signal on the third optical fiber (13) and transmitting the detected temperature signal and photoelectric signal to the master control device (3);
when the temperature signal detected by the temperature detector (8) is greater than a preset threshold value or the photoelectric signal detected by the photoelectric detector (9) is 0, the master control device (3) closes the first laser source (1) and the second laser source (2).
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| CN202010423577.9A CN111585155A (en) | 2020-05-19 | 2020-05-19 | Composite laser system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112247371A (en) * | 2020-10-13 | 2021-01-22 | 镭煌激光技术(苏州)有限公司 | Flexible laser energy combining control system of laser light path |
| CN113418681A (en) * | 2021-07-09 | 2021-09-21 | 江苏亮点光电研究有限公司 | Multithreading laser power measuring device suitable for laser aging test |
-
2020
- 2020-05-19 CN CN202010423577.9A patent/CN111585155A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112247371A (en) * | 2020-10-13 | 2021-01-22 | 镭煌激光技术(苏州)有限公司 | Flexible laser energy combining control system of laser light path |
| CN112247371B (en) * | 2020-10-13 | 2022-08-02 | 镭煌激光技术(苏州)有限公司 | Flexible laser energy combining control system of laser light path |
| CN113418681A (en) * | 2021-07-09 | 2021-09-21 | 江苏亮点光电研究有限公司 | Multithreading laser power measuring device suitable for laser aging test |
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