CN217934560U

CN217934560U - Optical fiber laser

Info

Publication number: CN217934560U
Application number: CN202221435889.2U
Authority: CN
Inventors: 陈彬
Original assignee: YLX Inc
Current assignee: YLX Inc
Priority date: 2022-06-08
Filing date: 2022-06-08
Publication date: 2022-11-29
Anticipated expiration: 2032-06-08

Abstract

The application relates to the technical field of laser and discloses a fiber laser. The fiber laser comprises at least one laser chip for emitting a laser beam; at least one converging lens group for converging the laser beam into a light-emitting spot; at least one fast axis collimation lens group, which is used for carrying out fast axis direction collimation on the laser beams which are converged to form a luminous point and then continue to advance; the slow axis collimation lens group is used for carrying out slow axis direction collimation on the laser beam collimated in the fast axis direction; the first reflector group is used for compressing the laser beam collimated in the slow axis direction in the fast axis direction; and the first condenser group is used for converging the compressed laser beams to the light inlet of the optical fiber. Based on the mode, the laser beams are converged into a luminous point and are subjected to fast and slow axis collimation, and then are further compressed through the first reflector group, so that the laser beams of a plurality of laser chips can be synthesized, and higher output power is obtained.

Description

Optical fiber laser

Technical Field

The application relates to the technical field of laser, in particular to a fiber laser.

Background

Compared with a common light source, the laser has good monochromaticity and directivity and higher brightness, and is applied to many fields as a novel light source with the characteristics of pure quality and stable spectrum. In increasingly complex laser application scenes, increasing the yield and reliability of lasers and reducing the cost and weight of lasers become important research points for laser market application.

Traditional fiber laser passes through collimating lens and speculum synthesis laser beam, and the laser beam facula after nevertheless the synthesis is great, because its divergence angle is too big, is difficult to get into optic fibre when assembling optic fibre, simultaneously because encapsulate a plurality of laser instrument chips for casing itself is difficult to the heat dissipation. Therefore, the traditional fiber laser is difficult to synthesize laser beams of a plurality of laser chips, the output power of the fiber laser is low, and the beam quality is poor.

SUMMERY OF THE UTILITY MODEL

The application provides a fiber laser, can synthesize the laser beam of a plurality of laser chips, obtain higher output.

In order to solve the above problem, the present application provides a fiber laser including:

at least one laser chip for emitting a laser beam;

the converging lens group is arranged on a light path of the corresponding laser beam and is used for converging the laser beam into a light emitting point;

the fast axis collimation lens group is arranged on a light path of the corresponding laser beam and is used for carrying out fast axis direction collimation on the laser beam which continues to advance after being converged into a luminous point;

the slow axis collimating lens group is arranged on a light path of the corresponding laser beam and is used for collimating the laser beam collimated in the fast axis direction in the slow axis direction;

the first reflector group is arranged on a light path of the corresponding laser beam and is used for compressing the laser beam collimated in the slow axis direction in the fast axis direction;

the first condenser group is arranged on a light path of the compressed laser beam and is used for converging the compressed laser beam to a light inlet of the optical fiber.

Further, the optical fiber laser further comprises at least one second reflecting mirror, and the second reflecting mirror is arranged on the corresponding optical path of the laser beam and is used for reflecting the laser beam to the converging lens group.

Further, the fiber laser further comprises at least one shell, and the second reflector and the laser chip are arranged in the same shell or different shells.

The present application provides a fiber laser, including: at least one laser chip for emitting a laser beam; the converging lens group is arranged on a light path of the corresponding laser beam and is used for converging the laser beam into a light-emitting point; the fast axis collimation lens group is arranged on a light path of the corresponding laser beam and is used for carrying out fast axis direction collimation on the laser beam which continues to advance after being converged into a luminous point; the slow axis collimation lens group is arranged on a light path of the corresponding laser beam and is used for carrying out slow axis direction collimation on the laser beam after being collimated in the fast axis direction; the first reflector group is arranged on a light path of the corresponding laser beam and is used for compressing the laser beam collimated in the slow axis direction in the fast axis direction; and the first condenser group is arranged on the light path of the compressed laser beam and is used for converging the compressed laser beam to the light inlet of the optical fiber. The fiber laser converges laser beams emitted by the laser chips through the converging lens group, the fast-slow axis collimating lens group collimates the laser beams, the first reflector group compresses in the fast axis direction, and the first condenser group converges to form a light emitting point, so that the laser beams of the laser chips are synthesized, light spots can be effectively compressed, and the beam quality of the fiber laser is improved.

Drawings

FIG. 1 is a schematic structural diagram of a first embodiment of a fiber laser of the present application along the fast axis;

FIG. 2 is a schematic structural diagram of a first embodiment of the fiber laser of the present application along the slow axis direction;

FIG. 3 is a schematic structural diagram of a second embodiment of the fiber laser of the present application;

FIG. 4 is a schematic structural diagram of a third embodiment of the fiber laser of the present application along the fast axis direction;

fig. 5 is a schematic structural diagram of a third embodiment of the fiber laser of the present application along the slow axis direction.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first", "second", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a first embodiment of a fiber laser of the present application along a fast axis direction, and fig. 2 is a schematic structural diagram of the first embodiment of the fiber laser of the present application along a slow axis direction.

The fiber laser of the present application includes at least one laser chip 100, at least one second reflecting mirror 200, and at least one converging lens group 300, and the second reflecting mirror 200 and the converging lens group 300 are disposed on an optical path of a laser beam emitted from the corresponding laser chip 100. The laser chip 100 emits a laser beam, the second reflecting mirror 200 reflects the laser beam to the corresponding converging lens group 300, and the converging lens group 300 converges the laser beam into a light emitting point. The second reflector 200 and the corresponding laser chip 100 are disposed in the same housing or different housings, and the same housing may include a plurality of laser chips 100.

Further, the fiber laser further includes at least one fast axis collimating lens group 400 and at least one slow axis collimating lens group 500, and the fast axis collimating lens group 400 and the slow axis collimating lens group 500 are sequentially disposed on the light path of the corresponding laser beam and are configured to perform fast and slow axis collimation on the laser beam that continues to travel after converging to form the light emitting point.

Further, the optical fiber laser further includes at least one first mirror group 600, and the first mirror group 600 is disposed on the light path of the corresponding laser beam and is configured to compress the laser beam collimated by the fast and slow axes in the fast axis direction.

Further, the optical fiber laser further includes a first condenser group 700, and the first condenser group 700 is disposed on a light path of the compressed laser beam and is configured to condense the compressed laser beam to the light inlet of the optical fiber 800.

In the present embodiment, the laser chip 100 includes a first laser chip 101 and a second laser chip 102 for emitting laser beams, where the first laser chip 101 emits a first laser beam, and the second laser chip 102 emits a second laser beam, and the bottom surfaces of the first laser chip 101 and the second laser chip 102 are located on the same plane.

It should be noted that the bottom surfaces of the first laser chip 101 and the second laser chip 102 are disposed on the same plane, so that the first laser chip 101 and the second laser chip 102 can better dissipate heat in the process of emitting laser beams, and the laser chip 100 can be protected in the process of actual use, thereby prolonging the service life of the device.

The optical fiber laser further comprises two second reflectors 200, one second reflector 201 of the two second reflectors is arranged on the optical path of the first laser beam, and the first laser chip 101 and the second reflector are arranged in the shell and used for reflecting the first laser beam emitted by the first laser chip 101; the other second mirror 202 of the two second mirrors 200 is disposed on the second laser beam optical path, and is disposed in the housing with the second laser chip 102 for reflecting the second laser beam emitted by the second laser chip 102. The first laser chip 101 and the second laser chip 102 may be disposed inside the same housing, or inside two housings.

Alternatively, when the fiber laser is provided with a plurality of laser chips 100, the plurality of laser chips 100 may be provided inside the same housing, or inside a plurality of housings. Meanwhile, the laser chip 100 and the second reflector 200 are packaged in the shell in advance, so that the cost and the weight of the shell are reduced, the quality and the reliability of the fiber laser are improved, and the assembly error caused by manually assembling the laser chip 100 and the second reflector 200 on the shell is avoided.

After the laser chip 100 emits the laser beam, the converging lens group 300 is disposed on the light path of the corresponding laser beam to converge the laser beam into a light emitting point. A first converging lens group 301 is arranged on a light path of a first laser beam emitted by the first laser chip 101, and converges the first laser beam into an array of light-emitting points; a second converging lens group 302 is disposed on a light path of a second laser beam emitted by the second laser chip 102, and converges the second laser beam into a second array of light emitting points. In the present embodiment, the first and second

converging lens groups

301 and 302 each use two converging lenses. The converging lens group 300 provides a better converging effect to the laser beam emitted from the laser chip 100 by using two converging lenses. It should be noted that, in other embodiments, the converging lens group 300 may converge the laser beam by using one or more converging lenses.

The fiber laser further comprises a fast axis collimating lens group 400 and a slow axis collimating lens group 500, wherein the fast axis collimating lens group 400 and the slow axis collimating lens group 500 are sequentially arranged on the light path of the corresponding laser beam. A first fast axis collimating lens group 401 and a first slow axis collimating lens group 501 are sequentially arranged on a light path of the first laser beam, the first fast axis collimating lens group 401 performs fast axis direction collimation on the first laser beam which continues to travel after being converged into a first array light emitting point by the first converging lens group 301, and the first slow axis collimating lens group 501 performs slow axis direction collimation on the first laser beam which is collimated in the fast axis direction; a second fast axis collimating lens group 402 and a second slow axis collimating lens group 502 are sequentially arranged on the light path of the second laser beam, the second fast axis collimating lens group 402 performs fast axis direction collimation on the second laser beam which continues to travel after being converged into a second array light-emitting point by the second converging lens group 302, and the second slow axis collimating lens group 502 performs slow axis direction collimation on the second laser beam which is collimated in the fast axis direction.

In this embodiment, the focal length of the first fast axis collimating lens group 401 is smaller than the focal length of the first slow axis collimating lens group 501, and the focal length of the first slow axis collimating lens group 501 is smaller than or equal to the distance between the first laser chip 101 and the second laser chip 102 in the slow axis direction divided by the tangent function of the divergence angle of the imaging point of the first laser chip 101 in the slow axis direction. The focal length of the second fast axis collimating lens group 402 is less than that of the second slow axis collimating lens group 502, and the focal length of the second slow axis collimating lens group 502 is less than or equal to the distance between the first laser chip 101 and the second laser chip 102 in the slow axis direction divided by the tangent function of the divergence angle of the imaging point of the second laser chip 102 in the slow axis direction.

It should be noted that fast-axis collimating lens group 400/slow-axis collimating lens group 500 includes at least one of a spherical lens, a free-form lens, a cylindrical lens, or a binary diffractive device. Because the divergence angle of the laser beam emitted by the laser chip 100 in the fast axis direction is large, the divergence angle of the laser beam in the fast axis direction is easily too large in the process of synthesizing the laser beams of the plurality of laser chips 100 in the optical fiber laser, and exceeds the receiving numerical aperture angle of the optical fiber 800 in the optical fiber laser, so that the synthesized laser beam is difficult to enter the optical fiber 800. Through corresponding use fast axle collimating lens group 400 in the great direction of laser beam divergence angle of laser chip 100 transmission, fast axle collimating lens group 400 carries out fast axle direction collimation back to laser beam, compresses the array light-emitting point of laser beam at fast axle direction for fiber laser can synthesize the laser beam of more laser chip 100 transmissions, makes the laser beam after the synthesis easily get into in the optical fiber 800 receivable range simultaneously. By correspondingly using the slow axis collimating lens assembly 500 in the direction of smaller divergence angle of the laser beam emitted by the laser chip 100, the slow axis collimating lens assembly 500 collimates the laser beam in the slow axis direction and then compresses the array light emitting points of the laser beam in the slow axis direction.

The fiber laser further includes a first mirror group 600, and the mirror group 600 is disposed on the light path of the corresponding laser beam and is configured to compress the laser beam collimated in the slow axis direction in the fast axis direction. The first mirror group 600 of the present embodiment includes two first mirrors, one of the two first mirrors 601 is disposed on the first laser beam light path, and is configured to compress the first laser beam in the fast axis direction; the other first mirror 602 of the two first mirrors is disposed on the optical path of the second laser beam, and is configured to compress the second laser beam in the fast axis direction. The first reflecting mirror group 600 further compresses the laser beam in the fast axis direction, so that the laser beam can be compressed in the fast axis direction to be smaller, and the fiber laser can synthesize more laser beams emitted by the laser chip 100.

The optical fiber laser further includes a first condenser group 700, and the first condenser group 700 is disposed on the light path of the first laser beam and the second laser beam compressed by the fast axis collimating lens group 400, the slow axis collimating lens group 500, and the first reflector group 600, and is configured to converge the compressed first laser beam and the compressed second laser beam to the light inlet of the optical fiber 800. Further, the optical fiber 800 is disposed at the light exit of the first condenser lens group 700, the first condenser lens group 700 converges the first laser beam and the second laser beam to the optical fiber 800 for receiving, and the optical fiber 800 guides the light emitting point converged by the first condenser lens group 700.

The fiber laser of the present embodiment includes at least one laser chip 100 for emitting a laser beam; the converging lens group 300 is arranged on the light path of the corresponding laser beam and is used for converging the laser beam into a light-emitting point; the fast axis collimation lens group 400 is arranged on the light path of the corresponding laser beam and is used for carrying out fast axis direction collimation on the laser beam which continues to advance after being converged into a luminous point; the slow axis collimating lens group 500 is arranged on a light path of the corresponding laser beam and is used for collimating the laser beam collimated in the fast axis direction in the slow axis direction; the first reflector group 600 is arranged on a light path of the corresponding laser beam and used for compressing the laser beam collimated in the slow axis direction in the fast axis direction; the first condenser lens group 700, the first condenser lens group 700 is disposed on the light path of the compressed laser beam, and is configured to condense the compressed laser beam to the light inlet of the optical fiber 800. Based on the above mode, the laser beam that laser chip 100 launched carries out the ascending collimation in fast slow axis direction through fast axle collimating lens group 400 and slow axle collimating lens group 500, and the laser beam further compresses in fast axle direction through first speculum group 600 after the collimation for the laser beam that fiber laser can synthesize a plurality of laser chip 100 launches, and first condenser group 700 assembles the laser beam after compressing to optic fibre 800 and receives simultaneously, thereby improves fiber laser's beam quality.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a second embodiment of the fiber laser of the present application. The fiber laser of the present embodiment includes at least one laser chip 100, at least one converging lens group 300, at least one fast axis collimating lens group 400, at least one slow axis collimating lens group 500, at least one first mirror group 600, and a first condenser group 700.

The fiber laser of the present embodiment includes a first laser chip set 103, a second laser chip set 104, a third laser chip set 105, and a fourth laser chip set 106, where each set of laser chips 100 is packaged in the same housing. The first laser chip set 103 and the second laser chip set 104 are located on one side of the fiber laser, and the bottom surfaces of the laser chips 100 of the first laser chip set 103 and the second laser chip set 104 are located on the same plane; the third laser chip set 105 and the fourth laser chip set 106 are located on the other side of the fiber laser, and the bottom surfaces of the laser chips 100 of the third laser chip set 105 and the fourth laser chip set 106 are located on the same plane, so that the laser chips 100 can better dissipate heat in the process of emitting laser beams, the laser chips 100 can be protected in the actual use process, and the service life of the device is prolonged.

It should be noted that the laser chip 100 in this embodiment is an MCP laser (high power micro-channel packaged semiconductor laser), and the MCP laser (high power micro-channel packaged semiconductor laser) has the characteristics of high efficiency and long service life, and is widely applied to the fields of pumping of high power solid state lasers, scientific research, medical treatment, and the like.

Further, the fiber laser includes a third mirror group 203, a fourth mirror group 204, a fifth mirror group 205, and a sixth mirror group 206, each second mirror group 200 is disposed on a corresponding laser beam light path, and is disposed in the same housing as the corresponding laser chip 100, for reflecting the laser beam emitted by the laser chip 100.

Further, the fiber laser includes a first group of converging lens group 303, a second group of converging lens group 304, a third group of converging lens group 305, and a fourth group of converging lens group 306. Every four converging lenses are a converging lens group 300, and each converging lens in each group is arranged on the light path of the laser beam emitted by the corresponding laser chip 100 and converges the laser beam into a light-emitting point. And each converging lens group 300 uses two converging lenses, and the laser beam emitted by each laser chip 100 passes through the first converging lens to emit a laser beam with a spot of 5.5mm in the fast axis direction and then is converged into a light-emitting spot by the other converging lens, so that the laser beam emitted by the laser chip 100 is better converged.

Further, the fiber laser includes a third fast axis collimating lens group 403, a fourth fast axis collimating lens group 404, a fifth fast axis collimating lens group 405, and a sixth fast axis collimating lens group 406. Every four fast axis collimating lenses are a fast axis collimating lens group 400, each fast axis collimating lens in each group is arranged on the light path of the corresponding laser beam, the laser beams which continue to advance after being converged into a light emitting point by the converging lens group 300 are collimated in the fast axis direction, the focal length of each fast axis collimating lens is small and is about 1mm, and therefore the laser beams are compressed in the fast axis direction.

Further, the fiber laser includes a third slow axis collimating lens group 503, a fourth slow axis collimating lens group 504, a fifth slow axis collimating lens group 505, and a sixth slow axis collimating lens group 506. Each slow axis collimating lens group 500 includes a slow axis collimating lens, which is disposed on the light path of the four laser beams of the corresponding fast axis collimating lens group 400, and performs slow axis direction collimation on the four laser beams collimated by the fast axis collimating lens in the fast axis direction, and the focal length of the slow axis collimating lens is large, about 12mm, so that the laser beams are not compressed in the slow axis direction during the slow axis direction collimation of the laser beams.

Further, the fiber laser includes a seventh mirror group 603, an eighth mirror group 604, a ninth mirror group 605, and a tenth mirror group 606. Each first mirror group 600 is disposed on the light paths of the four laser beams of the corresponding slow-axis collimating lens group 500, and different mirrors of the same group are located at different positions in space, so as to further compress the laser beams collimated by the fast and slow axes in the fast axis direction.

Further, the fiber laser includes a light guide mirror 900 and a light combining mirror 1000, and is disposed on the optical path of the laser beam that is further compressed in the fast axis direction. Laser beams emitted by the first laser chip set 103 and the second laser chip set 104 on one side of the fiber laser are incident to the light combining mirror 1000, and the light combining mirror 1000 transmits the laser beams to the first condenser lens set 700. The laser beams emitted by the third laser chip set 105 and the fourth laser chip set 106 on the other side of the fiber laser are guided to the light combining mirror 1000 by the light guiding mirror 900, and the light combining mirror 1000 reflects the laser beams emitted by the third laser chip set 105 and the fourth laser chip set 106 and guided by the light guiding mirror 900 to the first condenser lens group 700.

Further, the fiber laser includes a first condenser group 700 and an optical fiber 800. The first condenser lens group 700 is disposed on a light path of the compressed laser beam, and fast-slow axis-collimated laser beams passing through the corresponding fast axis collimating lens group 400, slow axis collimating lens group 500, and reflector group 600 are converged to the optical fiber 800, so that a spot diameter of the laser beam converged to the optical fiber 800 is minimized. The optical fiber 800 is disposed at the light exit of the first condenser lens group 700, the first condenser lens group 700 converges the compressed laser beam to the optical fiber 800 for receiving, and the optical fiber 800 guides the light emitting point converged by the first condenser lens group 700. The spot diameter is the ratio of the length of the light-emitting strip of the laser chip 100 multiplied by the focal length of the first condenser lens group 700 to the focal length of the slow-axis collimating lens, so that the smaller the focal length of the slow-axis collimating lens is, the smaller the spot diameter of the laser beam converged to the optical fiber 800 is.

The fiber laser of the present embodiment includes at least one laser chip 100 for emitting a laser beam; the converging lens group 300 is arranged on the light path of the corresponding laser beam and is used for converging the laser beam into a light-emitting point; the fast axis collimation lens group 400 is arranged on the light path of the corresponding laser beam and is used for carrying out fast axis direction collimation on the laser beam which continues to advance after being converged into a luminous point; the slow axis collimating lens group 500 is arranged on a light path of the corresponding laser beam and is used for collimating the laser beam collimated in the fast axis direction in the slow axis direction; the first reflector group 600 is arranged on a light path of the corresponding laser beam and used for compressing the laser beam collimated in the slow axis direction in the fast axis direction; the first condenser lens group 700, the first condenser lens group 700 is disposed on the light path of the compressed laser beam, and is configured to condense the compressed laser beam to the light inlet of the optical fiber 800. Based on the above mode, the laser beam that laser chip 100 launched carries out the ascending collimation in fast slow axis direction through fast axle collimating lens group 400 and slow axle collimating lens group 500, the laser beam further compresses in fast axle direction through first speculum group 600 after the collimation, make the laser beam that fiber laser can synthesize a plurality of laser chip 100 launches, first condenser group 700 assembles the laser beam after compressing to optic fibre 800 and receives simultaneously, thereby improve fiber laser's light beam quality, and be applicable to different application scenes.

Referring to fig. 4 and 5, fig. 4 is a schematic structural diagram of a third embodiment of the fiber laser of the present application along a fast axis direction, and fig. 5 is a schematic structural diagram of the third embodiment of the fiber laser of the present application along a slow axis direction. The fiber laser of the present embodiment includes at least one laser chip 100, at least one converging lens group 300, at least one fast axis collimating lens group 400, at least one slow axis collimating lens group 500, at least one first mirror group 600, and a first condenser group 700.

The fiber laser of the embodiment includes a fifth laser chip group 107 and a sixth laser chip group 108, each group of laser chips 100 is packaged in the same housing, and simultaneously, the bottom surfaces of the laser chips 100 of the fifth laser chip group 107 and the sixth laser chip group 108 are located on the same plane, so that the laser chips 100 can better dissipate heat in the process of emitting laser beams, the laser chips 100 can be protected in the process of actual use, and the service life of the device can be prolonged.

Further, the optical fiber laser includes an eleventh mirror group 607 and a twelfth mirror group 608, each second mirror 200 is disposed on a corresponding laser beam light path, and is disposed in the same housing with the corresponding laser chip 100, for reflecting the laser beam emitted by the laser chip 100.

Further, the fiber laser includes a fifth group of converging lens group 307 and a sixth group of converging lens group 308. Every four converging lenses are a converging lens group 300, and each converging lens in each group is arranged on the light path of the laser beam emitted by the corresponding laser chip 100 and converges the laser beam into a light-emitting point. And each of the converging lens groups 300 uses two converging lenses to achieve a better converging effect on the laser beams emitted from the laser chip 100.

Further, the fiber laser includes a seventh fast axis collimating lens group 407 and an eighth fast axis collimating lens group 408. Every four fast axis collimating lenses are a fast axis collimating lens group 400, and each fast axis collimating lens in each group is arranged on the light path of the corresponding laser beam to perform fast axis direction collimation on the laser beam which continues to travel after being converged into a luminous point by the converging lens group 300.

Further, the fiber laser includes a seventh slow axis collimating lens group 507 and an eighth slow axis collimating lens group 508. Each slow axis collimating lens group 500 includes a slow axis collimating lens, which is disposed on the light paths of the four laser beams of the corresponding fast axis collimating lens group 400, and performs slow axis direction collimation on the four laser beams collimated in the fast axis direction by the fast axis collimating lens group 400.

Further, the fiber laser includes a thirteenth mirror group 607 and a fourteenth mirror group 608. Every four first reflectors are a first reflector group 600, each first reflector in each group is arranged on the light path of the corresponding laser beam, and different reflectors in the same group are positioned at different positions in space so as to further compress the laser beam collimated by the fast and slow axes in the fast axis direction.

Further, the fiber laser includes a first condenser group 700 and an optical fiber 800. The first condenser group 700 is disposed on the light path of the compressed laser beam, and converges the laser beam, which is fast-axis collimated and compressed in the fast-axis direction by the corresponding fast-axis collimating lens group 400, slow-axis collimating lens group 500 and reflector group 600, to the optical fiber 800, so that the laser beams emitted by the fifth laser chip group 107 and the six laser chip groups 100 are combined by the first condenser group 700 disposed between the fifth reflector group 600 and the sixth reflector group 600, thereby reducing the optical path and minimizing the diameter of the light spot converged to the optical fiber 800. The optical fiber 800 is disposed at the light exit of the first condenser lens assembly 700, the first condenser lens assembly 700 converges the compressed laser beam to the optical fiber 800 for reception, and the optical fiber 800 guides the light emitting point converged by the first condenser lens assembly 700.

The fiber laser of the present embodiment includes at least one laser chip 100 for emitting a laser beam; the converging lens group 300 is arranged on the light path of the corresponding laser beam and is used for converging the laser beam into a light-emitting point; the fast axis collimation lens group 400 is arranged on the light path of the corresponding laser beam and is used for carrying out fast axis direction collimation on the laser beam which continues to advance after being converged into a luminous point; the slow axis collimating lens group 500 is arranged on a light path of the corresponding laser beam and is used for collimating the laser beam collimated in the fast axis direction in the slow axis direction; the first reflector group 600 is arranged on a light path of the corresponding laser beam and used for compressing the laser beam collimated in the slow axis direction in the fast axis direction; the first condenser lens group 700, the first condenser lens group 700 is disposed on the light path of the compressed laser beam, and is configured to condense the compressed laser beam to the light inlet of the optical fiber 800. Based on the above mode, the laser beam that laser chip 100 sent carries out the ascending collimation of fast slow axis through fast axis collimation lens group 400 and slow axis collimation lens group 500, the laser beam further compresses in fast axis direction through first speculum group 600 after the collimation for the laser beam that fiber laser can synthesize a plurality of laser chip 100 and send, first condenser group 700 assembles the laser beam after compressing to optic fibre 800 and receives simultaneously, thereby improve the beam quality of fiber laser, and be applicable to different application scenarios.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A fiber laser, comprising:

at least one laser chip for emitting a laser beam;

the converging lens group is arranged on a light path of the corresponding laser beam and is used for converging the laser beam into a luminous point;

the slow axis collimation lens group is arranged on a light path of the corresponding laser beam and is used for carrying out slow axis direction collimation on the laser beam after being collimated in the fast axis direction;

and the first condenser lens group is arranged on a light path of the compressed laser beam and is used for converging the compressed laser beam to a light inlet of the optical fiber.

2. The fiber laser of claim 1, wherein the fiber laser includes a plurality of the laser chips, and wherein bottom surfaces of the plurality of laser chips are located on a same plane.

3. The fiber laser of claim 1, wherein the converging lens group comprises at least one converging lens.

4. The fiber laser of claim 1, wherein a focal length of the fast axis collimating lens group is less than a focal length of the slow axis collimating lens group.

5. The fiber laser of claim 4, wherein the fast axis/slow axis collimating lens group comprises at least one of a spherical lens, a free-form lens, a cylindrical lens, or a binary diffractive device.

6. The fiber laser of claim 1, further comprising at least one second mirror disposed on an optical path of the corresponding laser beam for reflecting the laser beam to the converging lens group.

7. The fiber laser of claim 6, further comprising at least one housing, the second mirror and the laser chip being disposed within the same housing or different housings.

8. The fiber laser of claim 1, comprising at least two sets of said laser chips, at least two sets of said converging lens groups, at least two sets of said fast axis collimating lens groups, at least two sets of said slow axis collimating lens groups, and at least two sets of said first mirror groups, different sets of said first mirror groups being located at different positions so as to compress said laser beam emitted by different sets of said laser chips in said fast axis direction.

9. The fiber laser of claim 8, further comprising a light guide mirror and a light combining mirror, the light guide mirror and the light combining mirror being disposed on an optical path of the compressed laser beam, the light guide mirror being configured to guide the laser beam emitted from one group of the laser chips to the light combining mirror, the light combining mirror being configured to reflect the laser beam guided from the light guide mirror to the first light collecting mirror group and transmit the laser beam emitted from another group of the laser chips incident on the light combining mirror to the first light collecting mirror group.

10. The fiber laser of claim 8, wherein a focal length of the slow axis collimating lens group is less than/equal to a distance of the laser chip in the slow axis direction divided by a tangent function of a divergence angle of an imaging point of the laser chip in the slow axis direction.