CN211743661U - High-power fiber laser based on beam combination technology - Google Patents
High-power fiber laser based on beam combination technology Download PDFInfo
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- CN211743661U CN211743661U CN202020507870.9U CN202020507870U CN211743661U CN 211743661 U CN211743661 U CN 211743661U CN 202020507870 U CN202020507870 U CN 202020507870U CN 211743661 U CN211743661 U CN 211743661U
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Abstract
The utility model relates to a high-power fiber laser based on group bundle technique, include fiber laser array, the first array of optic fibre, lens, first grating, second grating, level crossing and the output coupling mirror that sets gradually along the light path, wherein, fiber laser array passes through optic fibre and is connected with the first array one-to-one of optic fibre, and the first array of optic fibre comprises many single mode fiber arrangements, and many single mode fiber are adjacent each other and are two-dimensional distribution. According to the fiber laser, the single-mode fiber heads are arranged in a two-dimensional distribution mode, and adjacent single-mode fiber heads can be subjected to beam superposition in space, so that the output power of a fiber head array is improved, the output power of a fiber laser group beam is improved, and the output brightness of the fiber laser group beam is improved.
Description
Technical Field
The utility model belongs to the technical field of optic fibre and laser, concretely relates to high-power fiber laser based on group bundle technique.
Background
The fiber laser/amplifier is a laser/amplifier using rare earth element doped fiber as gain medium, and the working band of the fiber laser/amplifier covers from ultraviolet to middle infrared by doping different rare earth elements such as erbium (Er), ytterbium (Yb), thulium (Tm), holmium (Ho), neodymium (Nd), etc. Compared with other lasers/amplifiers, the fiber laser/amplifier has the advantages of high energy conversion rate, good output beam quality, compact and stable structure, no need of optical path adjustment, good heat dissipation performance, long service life, no need of maintenance and the like, so that the fiber laser/amplifier is rapidly developed and widely applied.
Laser beam combination is a research hotspot in the technical field of laser in the world at present, aims to combine a plurality of laser beams into one beam for output, and is an effective means for greatly improving the output power and brightness of the laser. The output of the fiber laser array is synthesized by using a beam combination technology, so that the output power of dozens of to hundreds of kW can be obtained in the future, and the output power can be used as a light source of a laser system, so that the compactness and flexibility of the laser system can be greatly improved, and the practicability of the laser system is improved.
At present, how to improve the output power and the laser brightness of the fiber laser group beam still remains to be solved urgently.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems existing in the prior art, the utility model provides a high-power fiber laser based on group bundle technique. The to-be-solved technical problem of the utility model is realized through following technical scheme:
the embodiment of the utility model provides a high-power fiber laser based on the beam combination technology, which comprises a fiber laser array, a fiber head array, a lens, a first grating, a second grating, a plane mirror and an output coupling mirror which are arranged along a light path in sequence, wherein,
the fiber laser array is connected with the fiber head arrays in a one-to-one correspondence mode through optical fibers, each fiber head array is formed by arranging a plurality of single-mode optical fibers, the single-mode optical fibers are adjacent to each other and distributed in a two-dimensional mode, and the fiber head arrays are arranged on the front focal plane of the lens;
the first grating is arranged in front of a back focus of the lens and used for receiving and reflecting the light beam output by the lower half part of the main optical axis of the lens to form a first light beam;
the plane mirror is arranged on the first grating, intersects with the first grating and is used for receiving and reflecting the first light beam to form a second light beam;
the second grating and the first grating are in a crossed state, are arranged on one side of the reflecting surface of the plane mirror, and are used for receiving and reflecting the light beam output by the upper half part of the main optical axis of the lens to form a third light beam, and the third light beam is parallel to the second light beam;
the output coupling mirror is arranged on the light path of the second light beam and the third light beam, and is used for coupling the second light beam and the third light beam and outputting the coupled light beams.
In one embodiment of the present invention, a plurality of said single mode optical fibers are distributed in a circular disc and are arranged next to each other.
In an embodiment of the present invention, the focal length of the lens is 5 to 20 cm.
In an embodiment of the present invention, the fiber laser array includes a plurality of bidirectional pump lasers arranged side by side, the bidirectional pump laser includes: a double-clad active fiber, a first pump source input fiber, a second pump source input fiber, a first grating and a second grating,
the double-cladding active optical fiber sequentially comprises a doped fiber core, an inner cladding and an outer cladding from inside to outside, a pumping fiber core is arranged in the inner cladding, one end of the double-cladding active optical fiber is connected with a first grating, and the other end of the double-cladding active optical fiber is connected with a second grating;
the output end of the first pump source input optical fiber is connected with the input end of the first pump source input optical fiber, and the output end of the first pump source input optical fiber is connected with one end of the pump fiber core;
the output end of the second pump source input optical fiber is connected with the input end of the second pump source input optical fiber, and the output end of the second pump source input optical fiber is connected with the other end of the pump fiber core.
In one embodiment of the present invention, the refractive index of the doped core decreases gradually as the radius of the doped core increases.
In an embodiment of the present invention, the bidirectional pump laser further comprises a cladding light stripper disposed in a middle portion of the double-clad active optical fiber.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses set up the single mode fiber head into two-dimensional distribution's form, adjacent single mode fiber head can take place the light beam stack in the space to improve the output of fiber head array, improve the output that fiber laser group restrainted, improve the output luminance that fiber laser group restrainted.
Drawings
Fig. 1 is a high-power fiber laser based on a beam combination technique provided by the present invention;
fig. 2 is a schematic structural diagram of distribution of a plurality of single-mode optical fibers according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a bidirectional pump laser according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a double-clad active optical fiber according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the present invention is not limited thereto.
Example one
Referring to fig. 1, fig. 1 is a high-power fiber laser based on the beam combining technology provided by the present invention. The high-power optical fiber laser based on the beam combination technology comprises: the fiber laser device comprises a fiber laser array 1, a fiber head array 2, a lens 3, a first grating 4, a second grating 5, a plane mirror 6 and an output coupling mirror 7 which are sequentially arranged along a light path.
Specifically, fiber laser array 1 is connected with fiber head array 2 one-to-one through optic fibre, and fiber head array 2 is arranged by many single mode fiber 21 and constitutes, and many single mode fiber 21 are adjacent each other and are two-dimentional distribution, and fiber head array 2 sets up on the preceding focal plane of lens 3. The first grating 4 is arranged in front of the back focus of the lens 3 and is used for receiving and reflecting the light beam output by the lower half part of the main optical axis of the lens 3 to form a first light beam. The plane mirror 6 is disposed on the first grating 4 and intersects with the first grating 4, and is configured to receive and reflect the first light beam to form a second light beam. The second grating 5 and the first grating 4 are in a crossed state, and are used for receiving and reflecting the light beam output by the upper half part of the main optical axis of the lens 3 to form a third light beam, and the third light beam is parallel to the second light beam. The output coupling mirror 7 is disposed on the optical path of the second light beam and the third light beam, and is configured to couple the second light beam and the third light beam and output the coupled light beam.
In the embodiment, the single-mode optical fiber heads are arranged in a two-dimensional distribution mode, and the adjacent single-mode optical fiber heads can be subjected to beam superposition in space, so that the output power of the optical fiber head array is improved, the output power of the optical fiber laser group beam is improved, and the output brightness of the optical fiber laser group beam is improved.
In one embodiment, the plurality of single mode optical fibers 21 are distributed in a circular pattern and are abutted against each other.
Specifically, please refer to fig. 2, fig. 2 is a schematic structural diagram of distribution of a plurality of single mode optical fibers according to an embodiment of the present invention. In fig. 2, the number of single-mode fibers is 7, one of the fibers is located in the center of the disk, and the remaining 6 fibers are uniformly distributed around the center fiber and are all in close contact with the center fiber, and two adjacent fibers in the 6 fibers are close to each other.
In this embodiment, the plurality of single-mode fibers 21 are arranged in a disc distribution and are abutted against each other, so that light beams output by the plurality of single-mode fibers can be superposed in space to the greatest extent, the output power of the fiber head array is greatly improved, the output power of the fiber laser group beam is further improved, and the output brightness of the fiber laser group beam is also improved.
In a specific embodiment, the lens 3 is a biconvex lens for focusing the laser beam group output by the fiber head array 2. The focal length of the lens 3 can be 5-20 cm, preferably 5cm, at the moment, the focusing effect of the lens on the light beam is good, and the coupling efficiency of the optical fiber laser system is high.
In a specific embodiment, the first grating 4 and the second grating 5 can adopt the same structure, the grating period is 2-5 μm, and the grating frequency is 200mm-1～400mm-1And the thickness of the grating is 2-4 mm.
In this embodiment, the first grating and the second grating have the same structure, so that the diffraction efficiencies of the first grating and the second grating are the same, and a laser beam is obtained, which is favorable for coupling the output coupling mirror to the beam.
In one embodiment, the output coupling mirror 7 may be a partially reflective mirror, which is disposed perpendicular to the incident direction of the light beam, and the reflectivity of the light beam at the perpendicular incidence may be 5% to 30%.
The working process of the high-power fiber laser based on the beam combination technology is as follows: the optical fiber laser array 1 emits a plurality of divergent laser beam groups, the laser beam groups are output through the optical fiber head array 2, and the optical fiber head array 2 is disc-shaped, so that the laser beam groups are overlapped in space, one part of the overlapped laser beam groups irradiates to the upper half part (including a main optical axis) of the main optical axis of the lens 3, one part of the overlapped laser beam groups irradiates to the lower half part (including the main optical axis) of the main optical axis of the lens 3, after the lens 3 focuses light beams of all the parts, one part of the light beams are output from the upper half part of the main optical axis of the lens 3, the other part of the light beams are output from the lower half part of the main optical axis of the lens, and a plurality of light; the light beam emitted from the lower half part of the main optical axis of the lens 3 irradiates and passes through the second grating 5 to reach the first grating 4, the first grating 4 reflects the light beam to obtain a first light beam, and the reflected first light beam is reflected again by the plane mirror 6 to obtain a second light beam; the central light beam of the output light beam from the upper half part of the main optical axis of the lens 3 is incident to the second grating 5 at a Bragg angle, and the second grating 5 reflects the central light beam to form a third light beam; and adjusting the angles of the first grating 4, the plane mirror 6 and the second grating to enable the second beam and the third beam to be parallel and to perpendicularly enter the output coupling mirror 7, wherein the output coupling mirror 4 has a feedback function and forms a resonant cavity with the fiber laser array 1, and the beam is reflected and oscillated again before the resonant cavity to be amplified, so that the laser beam is output.
In a specific embodiment, the fiber laser array comprises several bidirectional pump lasers 11 arranged in parallel. Referring to fig. 3, fig. 3 is a schematic structural diagram of a bidirectional pump laser according to an embodiment of the present invention. The bidirectional pump laser 11 includes: double-clad active fiber 111, first pump source 112, first pump source input fiber 113, second pump source 114, second pump source input fiber 115, first grating 116, and second grating 117.
Specifically, one end of the double-clad active fiber 111 is connected to the second grating 116, and the other end is connected to the third grating 117, and the second grating 116 and the third grating 117 form a resonant cavity. The second grating 116 is a high reflectivity grating with reflectivity greater than 99% and the third grating 117 is a low reflectivity grating with reflectivity greater than 95% to achieve higher optical gain and lower noise gain.
The output end of the first pump source 112 is connected to the input end of a first pump source input fiber 113, and the output end of the first pump source input fiber 113 is connected to the double-clad active fiber 111 on one side of the second grating 116. The output end of the second pump source 114 is connected to the input end of a second pump source input fiber 115, and the output end of the second pump source input fiber 115 is connected to the double-clad active fiber 111 on one side of the third grating 117. The first pump source 112 and the first pump source input fiber 113 are sequentially a forward pump source and a forward pump source input fiber, and the second pump source 114 and the second pump source input fiber 115 are sequentially a backward pump source and a backward pump source input fiber.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a double-clad active optical fiber according to an embodiment of the present invention. The double-clad active fiber 111 includes a doped core 1111, an inner cladding 1112, and an outer cladding 1113 in this order from the inside to the outside, and a pump fiber 1114 is disposed in the inner cladding 1112. Further, the input end of the first pump source input fiber 113 and the input end of the second pump source input fiber 115 are respectively connected to the pump fibers 1114 in the double-clad active fiber 111, so that the pump sources directly pump the pump light into the pump fibers 1114.
Further, the refractive indices of the doped core 1111, the inner cladding 1112, and the outer cladding 1113 are sequentially decreased such that most of the energy can be transmitted in the doped core 1111. The outer cladding 1113 may be made of a polymer material to protect the doped core 1111, to improve the mechanical strength and microbending resistance of the fiber, and to reduce attenuation. The refractive index of the pumping core 14 is less than that of the inner cladding 1112 so that most of the energy is coupled into the inner cladding 1112 and is transmitted in the doped core 1111.
The pumping fiber core is arranged in the inner cladding of the double-cladding active optical fiber, so that the first pumping source and the second pumping source are directly connected with the pumping fiber core through the optical fiber, the adoption of a pumping coupler is avoided, the welding points of the pumping coupler are reduced, the leakage of pumping light and signal light in the light at the welding points is avoided, and the output power of laser is improved.
The working process of the optical fiber laser comprises the following steps: the first pump source 112 generates laser light, and the laser light is transmitted to the pump core 14 through the first pump source input optical fiber 113; laser light entering the pumping core 14 is coupled into the inner cladding 1112 and reflected off the interface of the inner cladding 1112 and the outer cladding 1113 into the doped core 1111; the laser generates stimulated radiation in the doped fiber core 1111 to be amplified, the amplified laser oscillates in the resonant cavity, and after the amplified light reaches the third grating 117, most of the amplified light is reflected into the double-clad active fiber 111 again, so that the stimulated radiation is generated again in the double-clad active fiber 111 to be amplified; when the re-amplified light reaches the second grating 116, the light source is totally reflected; once each reflection of the light source occurs, the laser produces an amplification process until, after the light intensity reaches a threshold, a small portion of the amplified light is output through the third grating 117, and the remaining light continues to be reflected back to produce light amplification.
In one particular embodiment, the index of refraction of the doped core 1111 is gradually decreased as the radius of the doped core 1111 increases, resulting in a graded-index fiber.
In this embodiment, the doped fiber core 1111 is configured as a graded-index fiber, which can reduce the loss of light in the doped fiber core 1111, so that the double-clad active fiber outputs higher pulses, thereby improving the output energy of the fiber laser.
In one embodiment, the number of the pumping cores 1114 is multiple, and the multiple pumping cores 1114 are uniformly distributed around the doped core 1111, so that the quality of the laser beam is prevented from being reduced, and the processing requirement of high power and high beam quality is ensured.
In a particular embodiment, the bi-directional pump laser further comprises a cladding light stripper 118. The cladding light stripper 118 is disposed in the middle of the double-clad active optical fiber 111; the power of the signal light borne by the cladding light stripper is more than 500W, and the power of the strippable pump is more than 50W. The cladding light stripper 118 is used to strip the cladding light generated in the inner cladding 1112 in the process of the laser light being oscillated and amplified.
The fiber laser of this embodiment sets up the cladding light stripper at the middle part of double-clad active optical fiber to the power of bearing signal light of cladding light stripper is greater than 500W, and strippable pumping power is greater than 50W, can reduce the light in the cladding and get into first pump source and second pump source in, has reduced the cladding light and has caused the harm to first pump source and second pump source, and then has improved fiber laser's life.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (6)
1. A high-power fiber laser based on beam combination technology is characterized by comprising a fiber laser array, a fiber head array, a lens, a first grating, a second grating, a plane mirror and an output coupling mirror which are sequentially arranged along a light path,
the fiber laser array is connected with the fiber head arrays in a one-to-one correspondence mode through optical fibers, each fiber head array is formed by arranging a plurality of single-mode optical fibers, the single-mode optical fibers are adjacent to each other and distributed in a two-dimensional mode, and the fiber head arrays are arranged on the front focal plane of the lens;
the first grating is arranged in front of a back focus of the lens and used for receiving and reflecting the light beam output by the lower half part of the main optical axis of the lens to form a first light beam;
the plane mirror is arranged on the first grating, intersects with the first grating and is used for receiving and reflecting the first light beam to form a second light beam;
the second grating and the first grating are in a crossed state, are arranged on one side of the reflecting surface of the plane mirror, and are used for receiving and reflecting the light beam output by the upper half part of the main optical axis of the lens to form a third light beam, and the third light beam is parallel to the second light beam;
the output coupling mirror is arranged on the light path of the second light beam and the third light beam, and is used for coupling the second light beam and the third light beam and outputting the coupled light beams.
2. The group beam technology based high power fiber laser of claim 1, wherein a plurality of said single mode fibers are distributed in a circular disc and are in close proximity to each other.
3. The high-power fiber laser based on the beam combination technology as claimed in claim 1, wherein the focal length of the lens is 5-20 cm.
4. The high power fiber laser based on the beam combining technique according to claim 1, wherein the fiber laser array comprises a plurality of bidirectional pump lasers arranged in parallel, the bidirectional pump lasers comprising: a double-clad active fiber, a first pump source input fiber, a second pump source input fiber, a first grating and a second grating,
the double-cladding active optical fiber sequentially comprises a doped fiber core, an inner cladding and an outer cladding from inside to outside, a pumping fiber core is arranged in the inner cladding, one end of the double-cladding active optical fiber is connected with a first grating, and the other end of the double-cladding active optical fiber is connected with a second grating;
the output end of the first pump source input optical fiber is connected with the input end of the first pump source input optical fiber, and the output end of the first pump source input optical fiber is connected with one end of the pump fiber core;
the output end of the second pump source input optical fiber is connected with the input end of the second pump source input optical fiber, and the output end of the second pump source input optical fiber is connected with the other end of the pump fiber core.
5. The group beam technology-based high power fiber laser of claim 4, wherein the index of refraction of the doped core gradually decreases as the radius of the doped core increases.
6. The group-bundle-technology-based high-power fiber laser of claim 4, wherein the bidirectional pump laser further comprises a cladding light stripper disposed in the middle of the double-clad active fiber.
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| CN202020507870.9U CN211743661U (en) | 2020-04-08 | 2020-04-08 | High-power fiber laser based on beam combination technology |
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