CN111490440B - Optical gate for energy-division high-power optical fiber laser - Google Patents
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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Abstract
The invention discloses an optical gate for an energy-splitting high-power optical fiber laser, which comprises an input port, a collimating mirror, a first beam splitter, a second beam splitter, a reflecting mirror, an optical receiver, a first focusing mirror, a second focusing mirror, a third focusing mirror, a first output port, a second output port, a third output port, a first electrode plate, a second electrode plate, a third electrode plate, a fourth electrode plate, a first temperature detector, a second temperature detector, a third temperature detector, a fourth temperature detector, a fifth temperature detector, a first photoelectric detector, a second photoelectric detector and a third photoelectric detector, and is arranged on the optical gate. The first beam splitter, the second beam splitter and the reflector distribute the energy of the input laser and transmit the energy to the corresponding output channels for output, and a series of detectors are used for monitoring the internal state of the optical gate. The device of the invention enables one laser to provide light sources for a plurality of working units at the same time, monitors the states of components and light paths and ensures the use safety.
Description
Technical Field
The invention belongs to the field of fiber lasers, and particularly relates to an optical gate for an energy-division high-power fiber laser.
Background
Compared with other solid lasers, the fiber laser has the advantages of compact structure, good heat dissipation performance, high photoelectric conversion efficiency, good beam quality and the like. The industry of the domestic optical fiber laser starts late, but with the rapid development of laser manufacturing, the industry of the domestic optical fiber laser is rapidly developed in recent years. In the face of increasing market demands of optical fiber lasers, domestic laser production enterprises, colleges and universities and research institutes have increased research and development strength. With the rapid development of fiber lasers, especially the improvement of the stability of high-power continuous fiber lasers, the application field thereof is rapidly expanded, and the fiber lasers are widely applied to the fields of industrial processing, military, national defense, life science and the like. When a plurality of working units need to use laser simultaneously, a plurality of fiber lasers need to be configured to meet the requirements. In order to upgrade the industrial structure and effectively utilize resources, one fiber laser needs to realize the function of one machine with multiple purposes, and one laser is divided into multiple lasers for use.
In order to enable one laser to provide laser for a plurality of working units at the same time, the energy of one fiber laser can be transmitted to the plurality of working units at the same time according to a certain energy proportion by using the optical gate for the high-power fiber laser, so that the investment of laser equipment can be reduced, and the working efficiency is improved. At present, no mature optical gate product exists in the domestic market, and an energy distribution system and a control method of the optical gate product are basically blank.
Disclosure of Invention
The invention aims to provide an optical gate for an energy-division high-power optical fiber laser, which solves the problem that the optical fiber laser can only provide a light source for one working unit at the same time.
The technical solution for realizing the purpose of the invention is as follows: an optical gate for an energy-splitting high-power optical fiber laser comprises an input port, a collimating mirror, a first beam splitter, a second beam splitter, a reflecting mirror, an optical receiver, a first focusing mirror, a second focusing mirror, a third focusing mirror, a first output port, a second output port, a third output port, a first electrode plate, a second electrode plate, a third electrode plate, a fourth electrode plate, a first temperature detector, a second temperature detector, a third temperature detector, a fourth temperature detector, a fifth temperature detector, a first photoelectric detector, a second photoelectric detector and a third photoelectric detector.
The common optical path is sequentially provided with an input port, a collimating mirror, a first spectroscope, a second spectroscope, a reflector and a light receiver; the mirror surfaces of the first spectroscope, the second spectroscope and the reflector are parallel to each other and form 45-degree included angles with the optical axis respectively, the centers of the front surfaces of the first spectroscope, the second spectroscope and the reflector are intersected with the optical axis, the direction of the optical axis after the front surfaces of the first spectroscope, the second spectroscope and the reflector are reflected is vertical downwards, and the central axis of the light receiver is superposed with the optical axis; the first focusing mirror and the first output port are sequentially arranged along the light path reflected by the front surface of the first spectroscope, the second focusing mirror and the second output port are sequentially arranged along the light path reflected by the front surface of the second spectroscope, and the third focusing mirror and the third output port are sequentially arranged along the light path reflected by the front surface of the reflector.
The first electrode plate and the first temperature detector are correspondingly arranged on two sides of the inner wall of the input port, the second electrode plate and the second temperature detector are respectively arranged on two sides of the inner wall of the first output port, the third electrode plate and the third temperature detector are respectively arranged on two sides of the inner wall of the second output port, the fourth electrode plate and the fourth temperature detector are respectively arranged on two sides of the inner wall of the third output port, and the fifth temperature detector is arranged on the lower side of the inner wall of the light receiver; the first photoelectric detector, the second photoelectric detector and the third photoelectric detector are respectively arranged close to the first output port, the second output port and the third output port in an obliquely upward mode.
A control method for an optical gate based on an energy-division high-power optical fiber laser comprises the following steps:
step 1, checking devices, installing and adjusting an energy distribution system of an optical gate for a high-power optical fiber laser, and turning to step 2;
step 2, switching on an optical shutter power supply, and switching to step 3 when circuits of the first electrode plate, the second electrode plate, the third electrode plate and the fourth electrode plate are all paths, or switching to step 1;
step 3, inputting laser, and switching to step 4 when circuits of a first temperature detector, a second temperature detector, a third temperature detector, a fourth temperature detector, a fifth temperature detector, a first photoelectric detector, a second photoelectric detector and a third photoelectric detector are all paths, or switching to step 1;
step 4, the energy distribution system works normally; and (3) when at least one of the circuits of the first temperature detector, the second temperature detector, the third temperature detector, the fourth temperature detector, the fifth temperature detector, the first photoelectric detector, the second photoelectric detector and the third photoelectric detector is open circuit, closing the output of the laser, and turning to the step 1.
Compared with the prior art, the invention has the remarkable advantages that: (1) the energy-dividing optical gate can reduce the equipment cost investment of the laser and improve the working efficiency; (2) the energy-dividing optical gate isolates the output optical fiber of the optical fiber laser from the working unit, and protects the optical fiber of the laser from being damaged; (3) the energy-dividing optical gate provides a plurality of operating optical fibers for a plurality of working units to work, so that a user can conveniently replace the operating optical fibers at any time; (4) a temperature detector in the energy-division type optical gate monitors the temperature of the device, so that the safety of the system in long-time use is protected; the photoelectric detector has high sensitivity, and can make quick response to system adjustment, so that the optical gate coupling adjustment is quicker; (5) the photoelectric detector in the energy-division type optical gate can quickly respond to scattered light of an output port, and high coupling efficiency of the system is guaranteed; (6) the electrode plates in the energy-dividing optical gate can detect whether the optical fiber is correctly inserted, and can control the laser to close the laser, so that the safety of the optical gate is guaranteed.
Drawings
Fig. 1 is a schematic diagram of an optical gate for an energy-splitting high-power fiber laser according to the present invention.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
Referring to fig. 1, the optical gate for the energy-splitting high-power fiber laser comprises an input port 1, a collimating mirror 2, a first beam splitter 3, a second beam splitter 4, a reflecting mirror 5, an optical receiver 6, a first focusing mirror 7, a second focusing mirror 8, a third focusing mirror 9, a first output port 10, a second output port 11, a third output port 12, a first electrode plate 13, a second electrode plate 14, a third electrode plate 14, a fourth electrode plate 16, a first temperature detector 17, a second temperature detector 18, a third temperature detector 19, a fourth temperature detector 20, a fifth temperature detector 21, a first photoelectric detector 22, a second photoelectric detector 23 and a third photoelectric detector 24.
The common optical path is sequentially provided with an input port 1, a collimating mirror 2, a first spectroscope 3, a second spectroscope 4, a reflecting mirror 5 and a light receiver 6. The input port 1 is fixed on the side wall of the optical gate housing by screws through a clamping structure, and the output optical fiber of the laser is inserted into the input port 1 to output laser. The collimating lens 1 is arranged in a lens barrel with a water-cooling structure, and the lens barrel is screwed with the input port through threads. The first spectroscope 3, the second spectroscope 4 and the reflector 5 are respectively installed in a clamping device with a water-cooling structure and fixed on a bottom plate of the optical gate through screws. The light receiver 6 is internally provided with a water cooling structure and is arranged on the side wall of the optical gate shell through screws. The mirror surfaces of the first spectroscope 3, the second spectroscope 4 and the reflector 5 are parallel to each other and form an included angle of 45 degrees with the optical axis respectively, the centers of the front surfaces of the first spectroscope 3, the second spectroscope 4 and the reflector 5 are intersected with the optical axis, the direction of the optical axis after the front surfaces of the first spectroscope and the second spectroscope are reflected is vertical and downward, the light receiver 6 is provided with a water cooling structure, and the central axis of the light receiver coincides with the optical axis.
The first focusing mirror 7 and the first output port 10 are sequentially arranged along the light path reflected by the front surface of the first spectroscope 3, the second focusing mirror 8 and the second output port 11 are sequentially arranged along the light path reflected by the front surface of the second spectroscope 4, and the third focusing mirror 9 and the third output port 12 are sequentially arranged along the light path reflected by the front surface of the reflector 5. The first focusing lens 7, the second focusing lens 8 and the third focusing lens 9 are respectively arranged in a lens barrel with a water cooling structure, the lens barrel is arranged in a device capable of being adjusted in three dimensions through a spring, a screw and a screw rod, and the spatial position of the lens can be adjusted through rotating the screw rod. The first output port 10, the second output port 11 and the third output port 12 are fixed on the side wall of the optical gate through screws.
The optical axis between the front surfaces of the collimator lens 2 and the first beam splitter 3 is a first optical axis 25An optical axis between the rear surface of the spectroscope 3 and the front surface of the second spectroscope 4 is a second optical axis 26, an optical axis between the rear surface of the second spectroscope 4 and the front surface of the reflecting mirror 5 is a third optical axis 27, and an optical axis between the rear surface of the reflecting mirror 5 and the light receiver 6 is a fourth optical axis 28. In the energy-splitting optical shutter, the collimating mirror 2 outputs parallel laser beams, a part of the laser beams are reflected to the first output port 10 through the front surface of the first beam splitter 3 and output, another part of the laser beams are transmitted to the front surface of the second beam splitter 4 through the rear surface of the first beam splitter 3, and at this time, the second optical axis 26 is shifted in the vertical direction compared with the first optical axis 25, so that when the second beam splitter 4 is installed, the optical axis shift generated by the first beam splitter 3 needs to be considered, and it is avoided that the laser beams reflected by the front surface of the second beam splitter 4 cannot be coupled into the fiber core of the output optical fiber and transmitted due to the optical axis shift. Similarly, the optical axis shift is also considered when the mirror 5 and the light receiver 6 are mounted. The thicknesses of the first beam splitter 3, the second beam splitter 4 and the reflector 5 are d, the refractive index of the substrate is n, the distance by which the second optical axis (26) is higher than the first optical axis (25) in the vertical direction is h1, similarly, the distance by which the third optical axis (27) is higher than the second optical axis (26) in the vertical direction is h2, the distance by which the fourth optical axis (28) is higher than the third optical axis (27) in the vertical direction is h3,
wherein d represents the thickness of the lens and n1Representing the refractive index of the lens. And fixing the positions of the first beam splitter 3, the second beam splitter 4, the reflector 5 and the light receiver 6 according to the calculated h1, ensuring that the laser beam enters the center of each device, and avoiding potential safety hazards caused by laser deviation.
The surfaces of the optical elements of the collimating mirror 2, the first focusing mirror 7, the second focusing mirror 8 and the third focusing mirror 9 are coated with antireflection films, so that stray light generated when laser passes through the optical elements is reduced. The front surface of the optical element of the reflector 5 is plated with a high-reflection film, so that the laser loss is reduced, and the absorption of the substrate of the reflector 5 to laser energy is reduced. The front surfaces of the optical elements of the first spectroscope 3 and the second spectroscope 4 are coated with a film layer with a certain reflectivity, the rear surface is coated with an antireflection film, the reflectivity of the film layer on the front surface determines the ratio of the laser energy reflected by the front surface to the laser energy transmitted by the rear surface, and the working wavelengths of the laser energy reflected by the front surface and the laser energy transmitted by the rear surface are near infrared wavelength and red light wavelength.
The positions of the first focusing mirror 7, the second focusing mirror 8 and the third focusing mirror 9 can be finely adjusted by a three-dimensional adjusting mechanism so as to couple the light beams into the optical fibers in the first output port 10, the second output port 11 and the third output port 12 for transmission. The water cooling structure of the collimating lens 2, the first spectroscope 3, the second spectroscope 4, the reflecting mirror 5, the light collector 6, the first focusing mirror 7, the second focusing mirror 8 and the third focusing mirror 9 can reduce the temperature of the device during working, control the heat effect caused by laser and avoid the heat damage caused by laser.
In the energy-dividing type optical gate, the laser power can reach tens of thousands of watts, so a series of electronic devices are needed for signal detection and feedback, and the safety of the optical gate in use is ensured. The transmission optical fiber of the laser should be correctly inserted into the input port 1, and the output optical fibers should be correctly inserted into the first output port 10, the second output port 11, and the third output port 12, respectively, so that the sealing performance of the optical shutter can be ensured, the internal space of the optical shutter is prevented from being polluted, and the danger caused by the looseness of the device is prevented. The first electrode plate 13, the second electrode plate 14, the third electrode plate 15 and the fourth electrode plate 16 respectively detect whether optical fibers are correctly inserted into the input port 1, the first output port 10, the second output port 11 and the third output port 12, and if the optical fibers are correctly inserted, the circuits of the optical fibers are a path, which indicates that the state is normal, otherwise, the optical fibers are broken, which indicates that the state is abnormal. In the use process of the optical gate, when the internal stray light is too much, the optical gate device can absorb a large amount of stray light to greatly increase the temperature, and the optical gate device is easy to burn. Therefore, the temperatures of the input port 1, the first output port 10, the second output port 11, the third output port 12 and the light receiver 6 are respectively detected by the first temperature detector 17, the second temperature detector 18, the third temperature detector 19, the fourth temperature detector 20 and the fifth temperature detector 21, when the feedback signal of the temperature detectors is higher than the threshold set by the optical shutter, the circuits of the temperature detectors become open circuit, which indicates that the temperature of the optical shutter device is too high, and when the feedback signal of the temperature detectors is lower than the threshold set by the optical shutter, the circuits of the temperature detectors are closed circuit, which indicates that the temperature of the optical shutter device is normal. The coupling state of the laser inside the optical gate is very important, when the coupling state is poor, a large amount of laser cannot be coupled into the fiber core of the output optical fiber for transmission, laser leakage is generated at the moment, the leaked laser reaches hundreds of watts or even more kilowatts, and the optical fiber and the optical gate device are easily burnt, so that scattered light at the first output port 10, the second output port 11 and the third output port 12 is respectively detected by the first photoelectric detector 22, the second photoelectric detector 23 and the third photoelectric detector 24, when the coupling state is poor, the leaked laser forms stray light, the feedback signal of the photoelectric detector is higher than the threshold value set by the optical gate, the circuits of the photoelectric detectors are broken at the moment, the laser is not completely coupled into the fiber core of the output optical fiber, the optical path needs to be recalibrated, and when the feedback signal of the photoelectric detector is lower than the threshold value set by the optical gate, the circuit of the photoelectric detector is a passage, indicating a good coupling condition. The circuit of the electrode plate one 13 controls whether the laser can output laser, when the circuit of the electrode plate one 13 is a closed circuit, the laser can output laser, and when the circuit of the electrode plate one 13 is an open circuit, the laser cannot output laser.
The light splitting system is provided with three output ports, the number of the output ports can be expanded according to requirements, namely, an output channel formed by the first light splitting mirror 3, the first focusing mirror 7, the first output port 10, the second electrode plate 14, the second temperature detector 18 and the first photoelectric detector 22 is expanded side by side, and the reflectivity of the coating of the first light splitting mirror 3 is designed according to the laser energy required by the channel.
The method for controlling the optical gate for the energy-division high-power optical fiber laser comprises the following steps:
step 1, checking devices, installing and adjusting an energy distribution system of an optical gate for a high-power optical fiber laser, and turning to step 2;
step 2, switching on a light shutter power supply, and switching to step 3 when circuits of the first electrode plate 13, the second electrode plate 14, the third electrode plate 15 and the fourth electrode plate 16 are all paths, or switching to step 1;
step 3, inputting laser, and switching to step 4 when circuits of a first temperature detector 17, a second temperature detector 18, a third temperature detector 19, a fourth temperature detector 20, a fifth temperature detector 21, a first photoelectric detector 22, a second photoelectric detector 23 and a third photoelectric detector 24 are all connected, or switching to step 1;
step 4, the energy distribution system works normally; when at least one of the circuits of the first temperature detector 17, the second temperature detector 18, the third temperature detector 19, the fourth temperature detector 20, the fifth temperature detector 21, the first photoelectric detector 22, the second photoelectric detector 23 and the third photoelectric detector 24 is open-circuit, the output of the laser is closed, and the step 1 is carried out.
Claims (9)
1. A control method for an optical gate based on an energy-division high-power optical fiber laser is characterized by comprising the following steps:
step 1, checking devices, installing and adjusting an energy distribution system of an optical gate for a high-power optical fiber laser, the optical gate for the energy-division high-power optical fiber laser comprises an input port (1), a collimating mirror (2), a first spectroscope (3), a second spectroscope (4), a reflector (5), a light receiver (6), a first focusing mirror (7), a second focusing mirror (8), a third focusing mirror (9), a first output port (10), a second output port (11), a third output port (12), a first electrode plate (13), a second electrode plate (14), a third electrode plate (15), a fourth electrode plate (16), a first temperature detector (17), a second temperature detector (18), a third temperature detector (19), a fourth temperature detector (20), a fifth temperature detector (21), a first photoelectric detector (22), a second photoelectric detector (23) and a third photoelectric detector (24);
the common optical path is sequentially provided with an input port (1), a collimating mirror (2), a first spectroscope (3), a second spectroscope (4), a reflector (5) and a light receiver (6); the mirror surfaces of the first spectroscope (3), the second spectroscope (4) and the reflector (5) are parallel to each other and form an included angle of 45 degrees with the optical axis respectively, the centers of the front surfaces of the first spectroscope and the second spectroscope are intersected with the optical axis, the direction of the optical axis after the front surfaces of the first spectroscope and the second spectroscope are reflected is vertical downwards, and the central axis of the light receiver (6) is superposed with the optical axis; a first focusing mirror (7) and a first output port (10) are sequentially arranged along a light path reflected by the front surface of the first spectroscope (3), a second focusing mirror (8) and a second output port (11) are sequentially arranged along a light path reflected by the front surface of the second spectroscope (4), and a third focusing mirror (9) and a third output port (12) are sequentially arranged along a light path reflected by the front surface of the reflector (5);
the first electrode plate (13) and the first temperature detector (17) are correspondingly arranged on two sides of the inner wall of the input port (1), the second electrode plate (14) and the second temperature detector (18) are respectively arranged on two sides of the inner wall of the first output port (10), the third electrode plate (15) and the third temperature detector (19) are respectively arranged on two sides of the inner wall of the second output port (11), the fourth electrode plate (16) and the fourth temperature detector (20) are respectively arranged on two sides of the inner wall of the third output port (12), and the fifth temperature detector (21) is arranged on the lower side of the inner wall of the optical receiver (6); the first photoelectric detector (22), the second photoelectric detector (23) and the third photoelectric detector (24) are respectively arranged close to the first output port (10), the second output port (11) and the third output port (12) in an obliquely upward mode;
turning to the step 2;
step 2, switching on a light shutter power supply, switching to step 3 when circuits of the first electrode plate (13), the second electrode plate (14), the third electrode plate (15) and the fourth electrode plate (16) are all paths, and otherwise, switching to step 1;
step 3, inputting laser, and switching to step 4 when circuits of a first temperature detector (17), a second temperature detector (18), a third temperature detector (19), a fourth temperature detector (20), a fifth temperature detector (21), a first photoelectric detector (22), a second photoelectric detector (23) and a third photoelectric detector (24) are all paths, or switching to step 1;
step 4, the energy distribution system works normally; when at least one of the circuits of the first temperature detector (17), the second temperature detector (18), the third temperature detector (19), the fourth temperature detector (20), the fifth temperature detector (21), the first photoelectric detector (22), the second photoelectric detector (23) and the third photoelectric detector (24) is open-circuit, the output of the laser is closed, and the step 1 is carried out.
2. The method for controlling the optical shutter for the fiber laser based on the energy-division type high-power optical fiber according to claim 1, wherein: the optical axis between the collimating mirror (2) and the front surface of the first spectroscope (3) is a first optical axis (25), the optical axis between the rear surface of the first spectroscope (3) and the front surface of the second spectroscope (4) is a second optical axis (26), the optical axis between the rear surface of the second spectroscope (4) and the front surface of the reflector (5) is a third optical axis (27), and the optical axis between the rear surface of the reflector (5) and the light receiver (6) is a fourth optical axis (28); the thicknesses of the first spectroscope (3), the second spectroscope (4) and the reflector (5) aredThe refractive index of the substrate isnThe second optical axis (26) is vertically higher than the first optical axis (25) by a distance ofh1, likewise, the third optical axis (27) is higher than the second optical axis (26) by a distance ofh2, the fourth optical axis (28) is higher than the third optical axis (27) by a distance in the vertical directionh3，
WhereindWhich represents the thickness of the lens and,n 1representing the refractive index of the lens.
3. The method for controlling the optical shutter for the fiber laser based on the energy-division type high-power optical fiber according to claim 1, wherein: the surfaces of optical elements of the collimating mirror (2), the first focusing mirror (7), the second focusing mirror (8) and the third focusing mirror (9) are coated with antireflection films, the front surface of the optical element of the reflecting mirror (5) is coated with a high-reflection film, the front surfaces of the optical elements of the first light splitting mirror (3) and the second light splitting mirror (4) are coated with film layers with certain reflectivity, the rear surface is coated with an antireflection film, the reflectivity of the film layers on the front surfaces determines the ratio of laser energy reflected by the front surfaces to laser energy transmitted by the rear surfaces, and the working wavelengths of the laser energy reflected by the front surfaces and the laser energy transmitted by the rear surfaces are near infrared wavelength and red light wavelength.
4. The method for controlling the optical shutter for the fiber laser based on the energy-division type high-power optical fiber according to claim 1, wherein: the positions of the first focusing mirror (7), the second focusing mirror (8) and the third focusing mirror (9) can be finely adjusted by a three-dimensional adjusting mechanism so as to couple the light beams into optical fibers in the first output port (10), the second output port (11) and the third output port (12) respectively for transmission.
5. The method for controlling the optical shutter for the fiber laser based on the energy-division type high-power optical fiber according to claim 1, wherein: the device of the collimating lens (2), the first spectroscope (3), the second spectroscope (4), the reflecting mirror (5), the light collector (6), the first focusing mirror (7), the second focusing mirror (8) and the third focusing mirror (9) has a water circulation cooling function and is used for controlling the heat effect caused by laser.
6. The method for controlling the optical shutter for the fiber laser based on the energy-division type high-power optical fiber according to claim 1, wherein: the first electrode plate (13), the second electrode plate (14), the third electrode plate (15) and the fourth electrode plate (16) respectively detect whether optical fibers are inserted into the input port (1), the first output port (10), the second output port (11) and the third output port (12), and if the optical fibers are inserted, the circuits of the optical fibers are open circuits, otherwise, the circuits are open circuits; the first temperature detector (17), the second temperature detector (18), the third temperature detector (19), the fourth temperature detector (20) and the fifth temperature detector (21) are respectively used for detecting the temperature of the input port (1), the first output port (10), the second output port (11), the third output port (12) and the optical receiver (6); the first photoelectric detector (22), the second photoelectric detector (23) and the third photoelectric detector (24) respectively detect scattered light at the first output port (10), the second output port (11) and the third output port (12).
7. The method for controlling the optical shutter for the fiber laser based on the energy-division type high-power optical fiber according to claim 6, wherein: when the circuit of the first electrode plate (13) is a closed circuit, the laser can output laser, and when the circuit is an open circuit, the laser cannot output laser.
8. The method for controlling the optical shutter for the fiber laser based on the energy-division type high-power optical fiber according to claim 6, wherein: when the feedback signals of the first temperature detector (17), the second temperature detector (18), the third temperature detector (19), the fourth temperature detector (20), the fifth temperature detector (21), the first photoelectric detector (22), the second photoelectric detector (23) and the third photoelectric detector (24) are higher than the threshold value set by the optical gate, the circuits of the first temperature detector, the second temperature detector, the third photoelectric detector and the fourth photoelectric detector are broken, and otherwise, the circuits are closed.
9. The method for controlling the optical shutter for the fiber laser based on the energy-division type high-power optical fiber according to claim 1, wherein: the light splitting system is provided with three output ports, the number of the output ports can be expanded according to requirements, namely, an output channel formed by the first light splitting mirror (3), the first focusing mirror (7), the first output port (10), the second electrode plate (14), the second temperature detector (18) and the first photoelectric detector (22) is expanded side by side, and the reflectivity of a coating film of the first light splitting mirror (3) is designed according to laser energy required by the channel.
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