CN211605644U

CN211605644U - Optical fiber coupling structure of high-power semiconductor laser

Info

Publication number: CN211605644U
Application number: CN202020431506.9U
Authority: CN
Inventors: 蔡万绍; 刘佳敏; 张邦清
Original assignee: Shenzhen Vitality Laser Technology Co ltd
Current assignee: Shenzhen Vitality Laser Technology Co ltd
Priority date: 2020-03-30
Filing date: 2020-03-30
Publication date: 2020-09-29
Anticipated expiration: 2030-03-30

Abstract

The utility model discloses an optical fiber coupling structure of a high-power semiconductor laser, which relates to the technical field of semiconductor lasers and is used for solving the problem of poor stability of the laser output power of the prior high-power semiconductor laser, comprising an optical waveguide component, wherein the optical waveguide component is formed by connecting an incident port, an incident section, a connecting port, a light-emitting section and a light-emitting port in sequence, the outer diameter of the incident section is gradually reduced from the incident port to the connecting port, the outer diameter of the light-emitting section is matched with corresponding optical fibers, the light-emitting port is connected with the corresponding optical fibers, light emitted by a plurality of laser chips is projected to the incident port after being subjected to optical shaping and beam combination by a conventional method, then is guided in from one end of the optical fibers and is output from the other end of the optical fibers after being subjected to optical fiber transmission, the laser has the advantage of small output power loss even if the incident light beam and the light inlet are slightly misaligned.

Description

Optical fiber coupling structure of high-power semiconductor laser

Technical Field

The utility model relates to a semiconductor laser technical field, more specifically relate to a high power semiconductor laser's optical fiber coupling structure and method for the coupling between the semiconductor laser of hundreds of watts to thousands of watts power and optic fibre.

Background

The high-power semiconductor laser output by the optical fiber can be applied to the fields of laser industrial processing, night vision illumination, medical cosmetology and the like, and the working process of the laser generally comprises the steps of firstly generating laser by a plurality of to hundreds of semiconductor laser chip light-emitting units, then carrying out optical shaping and beam combination, then converging the laser into a thin spot-shaped light beam by a converging lens, directly projecting the light beam onto a fiber core at one end of the optical fiber at an angle which can be received by the optical fiber, transmitting the light beam in the optical fiber and outputting the light beam from the other end of the optical fiber.

However, in the manufacturing and application processes of the conventional high-power semiconductor laser, since the core diameter of the optical fiber itself is relatively small, generally several hundred microns or less, it is difficult for the projected beam to align with the incident end of the core, and the projected beam is easily deviated from the core, and the internal components of the laser are easily displaced or slightly changed in angle under the action of factors such as temperature variation, mechanical deformation, etc., and the projected beam is also difficult to stably align with the core of the optical fiber due to the slight change, so that the projected beam is easily deviated or partially deviated from the incident end of the core when the fine optical fiber is used for performing optical fiber coupling on the high-power semiconductor laser.

However, the deviation or partial deviation of the projected beam relative to the fiber core of the optical fiber inevitably results in that all or part of the projected beam cannot be output from the optical fiber, which causes a serious loss of the laser output power, so that in the actual working process, the conventional high-power semiconductor laser is easy to have a serious loss of the output power, and the laser output power stability is poor.

In addition, since the power of the projected beam is high, typically several hundred watts or even several kilowatts, and the spot formed by the projected beam is small, typically a rectangular spot with a diagonal of 100-.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: in order to solve the problem of poor laser output power stability of the existing high-power semiconductor laser when utilizing the tiny optical fiber coupling to output the laser, the utility model provides a high-power semiconductor laser's optical fiber coupling structure and method can effectively improve high-power semiconductor laser's laser output power's stability.

The utility model discloses a realize above-mentioned purpose and specifically adopt following technical scheme:

an optical fiber coupling structure of a high-power semiconductor laser comprises an optical waveguide assembly, wherein the optical waveguide assembly is formed by sequentially connecting an optical inlet, an optical inlet section, a connecting port, an optical outlet section and an optical outlet, the outer diameter of the optical inlet section is gradually reduced from the optical inlet to the connecting port, the optical inlet section is a trapezoid table or a circular table or a rotating curved surface, the optical outlet section is in a matched cuboid shape when the optical inlet section is the trapezoid table, the optical outlet section is in a matched cylindrical shape when the optical inlet section is the circular table or the rotating curved surface, the outer diameter of the optical outlet section is matched with corresponding optical fibers, the optical outlet is connected with the corresponding optical fibers, the optical outlet and the corresponding optical fibers are connected in a hard connection mode that dislocation is not easy to occur, such as fusion welding or optical transmission glue bonding and the like, the optical waveguide assembly realizes mechanical processing or integral forming of an optical transparent material by a fused biconical taper method and realizes or integrally forms a guided wave reflection medium interface of the optical waveguide assembly by utilizing the optical total reflection principle of Plating a full-reflection film.

Further, the optical waveguide module also comprises a converging lens, and the optical waveguide module is positioned between the converging lens and the corresponding optical fiber.

Furthermore, a coating film is arranged on the light inlet.

Further, the incident light BPP of the light inlet is slightly smaller than the BPP of the corresponding optical fiber.

Furthermore, the light emitted by the plurality of laser chips is subjected to optical shaping and beam combination by a conventional method, then is projected to a light inlet, then sequentially passes through a light inlet section, a connecting port, a light outlet section and a light outlet, then is led in from one end of the optical fiber, is transmitted by the optical fiber and then is output from the other end of the optical fiber, the light inlet section is of a structure which is reduced from the light inlet to a connecting port component, according to the basic principle of geometric optics, the beam diameter is reduced and the beam divergence angle is increased in the process that the light beam is input from the light inlet to the optical fiber and is output, but the product of the beam diameter and the beam divergence angle (BPP) can be kept unchanged, and the input light beam with large or small caliber is converted into the output light beam with small or large caliber through the light beam conversion of the optical waveguide component.

Further, the light emitted from the plurality of laser chips is optically shaped and combined by a conventional method, passes through a converging lens and then is projected to an optical inlet, is converged to a certain degree by the converging lens, then passes through the optical inlet, the connecting port, the optical outlet and the optical outlet in sequence, is guided in from one end of the optical fiber, is transmitted by the optical fiber and then is output from the other end of the optical fiber.

The utility model has the advantages as follows:

1. the optical waveguide component with the large-aperture light inlet is used for receiving the laser beam, the range for receiving the laser beam is enlarged, the power loss caused by micro misalignment is small, the influence on the integral output power of the laser is small, the power stability is high, the problem that the power loss is large because of alignment offset when the high-power laser beam is directly projected to the end face of a fine optical fiber is effectively solved, and the burn of the laser to peripheral parts of a fiber core because of the alignment offset is also avoided;

2. the optical waveguide component with the large-aperture light inlet is used for receiving laser beams, the laser power density of the light inlet is greatly reduced, the light inlet and a coating film of the light inlet cannot be damaged under larger total laser power, and the problem that the input end face of a small optical fiber is damaged by laser under the projection of high-power laser is effectively solved;

3. the optical waveguide component is provided with a large-caliber light inlet, so that optical fiber coupling is easier to realize, and the process difficulty of laser alignment is effectively reduced;

4. the method is suitable for the optical fiber coupling of a semiconductor laser with thousands of watts and ultrahigh power, and is also suitable for the optical fiber coupling of dozens of microns with particularly small optical fiber core fiber diameter.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the present invention;

the device comprises a 1-laser chip, a 2-beam shaping and beam combining device, a 3-light inlet, a 4-light inlet section, a 5-connecting port, a 6-light outlet section, a 7-light outlet, an 8-optical fiber, a 9-optical waveguide component and a 10-convergent lens.

Detailed Description

For a better understanding of the present invention, the following embodiments are described in further detail. The following detailed description of embodiments of the invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Example 1

As shown in fig. 1, this embodiment provides an optical fiber coupling structure of high power semiconductor laser, including optical waveguide component 9, optical waveguide component 9 is formed by connecting in proper order light inlet 3, light inlet section 4, connector 5, light outlet section 6 and light outlet 7, the external diameter of light inlet section 4 reduces gradually from light inlet 3 to connector 5, the external diameter of light outlet section 6 matches with corresponding optical fiber 8, the connected mode of light outlet 7 and corresponding optical fiber 8 is the butt fusion, specifically, optical waveguide component 9 is realized through the method of melting tapering, for example with the core fiber for 600um large-caliber optical fiber 8, join the method of melting tapering, draw into 100um core diameter, then with the optical fiber 8 butt fusion of 100um, export after transmitting laser to certain distance through 100um optical fiber 8.

Preferably, the optical waveguide assembly 9 is integrally formed and coated with a total reflection film on the outer side.

Preferably, the incident light BPP of the light inlet 3 is slightly smaller than the BPP of the corresponding optical fiber 8.

A method for coupling optical fiber 8 of high-power semiconductor laser, concretely, the light emitted by a plurality of laser chips 1 is processed by optical shaping and beam combination through a conventional method, then is projected to a light inlet 3, then sequentially passes through a light inlet section 4, a connecting port 5, a light outlet section 6 and a light outlet 7, then is led in from one end of the optical fiber 8, and is output from the other end of the optical fiber 8 after being transmitted through the optical fiber 8, the light inlet section 4 is a structure that the components from the light inlet 3 to the connecting port 5 are reduced, according to the basic principle of geometric optics, in the process that the light beam is input from the light inlet 3 to the optical fiber 8 and is output, the diameter of the light beam is reduced, the divergence angle of the light beam is increased, but the product (BPP) of the diameter of the light beam and the divergence angle of the light beam can be kept unchanged, and the BPP does not exceed the upper limit of the BPP parameter of the light beam which can be transmitted by the corresponding optical fiber, the input light beam with large caliber and small angle is converted into the output light beam with small caliber and large angle.

The working principle is as follows: light emitted by a plurality of laser chips 1 passes through the conventional beam shaping and beam combining device 2, enters the optical waveguide component 9 from the light inlet 3, passes through the light inlet section 4, the connecting port 5, the light outlet section 6 and the light outlet 7, enters one end of the optical fiber 8, and is output from the other end of the optical fiber 8, even if the internal components of the laser are influenced by external factors such as temperature change, mechanical stress deformation and the like to generate displacement or angle micro change, so that micro misalignment occurs, only small power is lost, the influence on the overall output power of the laser is small, the power stability is high, the problem that the power loss is large due to alignment deviation when a high-power laser beam is directly projected to the end face of the fine optical fiber 8 is effectively solved, and the problem that fiber core peripheral components are burnt by the laser due to the alignment deviation is also avoided.

Example 2

As shown in fig. 2, this embodiment is further improved on the basis of embodiment 1, and specifically, the present embodiment further includes a converging lens 10, and the optical waveguide assembly 9 is located between the converging lens 10 and the corresponding optical fiber 8.

A method for coupling optical fibers 8 of a high-power semiconductor laser is characterized in that light emitted by a plurality of laser chips 1 is subjected to optical shaping and beam combination by a conventional method, then is projected to a light inlet 3 after passing through a converging lens 10, is converged to a certain degree by the converging lens 10, then sequentially passes through a light inlet section 4, a connecting port 5, a light outlet section 6 and a light outlet 7, then is guided in from one end of the optical fiber 8, is transmitted by the optical fiber 8 and then is output from the other end of the optical fiber 8.

Preferably, the light inlet 3 is provided with a coating, the laser power density of the light inlet 3 is greatly reduced, the light inlet 3 and the coating thereof are not damaged under larger total laser power, and the problem that the input end face of the fine optical fiber 8 is damaged by laser under high-power laser projection is effectively solved.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, and the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the content of the description of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical fiber coupling structure of a high-power semiconductor laser is characterized in that: including optical waveguide subassembly (9), optical waveguide subassembly (9) are formed by connecting gradually income light mouth (3), income light section (4), connector (5), light-emitting section (6) and light-emitting mouth (7), the external diameter that goes into light section (4) reduces from going into light mouth (3) to connector (5) gradually, the external diameter of light-emitting section (6) cooperatees with corresponding optic fibre (8), light-emitting mouth (7) are connected with corresponding optic fibre (8).

2. A fiber coupling structure for high power semiconductor lasers as claimed in claim 1 wherein: and the optical waveguide component (9) is positioned between the convergent lens (10) and the corresponding optical fiber (8).

3. An optical fiber coupling structure of a high power semiconductor laser as claimed in claim 1 or 2, wherein: the light inlet (3) is provided with a coating film.

4. An optical fiber coupling structure of a high power semiconductor laser as claimed in claim 1 or 2, wherein: the BPP of the incident light of the light inlet (3) is slightly smaller than that of the corresponding optical fiber (8).