CN211859140U

CN211859140U - Fiber laser packaging hardware

Info

Publication number: CN211859140U
Application number: CN202020350890.XU
Authority: CN
Inventors: 李环宇
Original assignee: Langfang Luhuan Technology Co ltd
Current assignee: Langfang Luhuan Technology Co ltd
Priority date: 2020-03-19
Filing date: 2020-03-19
Publication date: 2020-11-03
Anticipated expiration: 2030-03-19

Abstract

The application provides a fiber laser packaging device, which comprises a packaging base and a packaging cover plate; a cavity is formed between the packaging base and the packaging cover plate; a ceramic substrate, a thermoelectric refrigerator, a thermistor and an optical fiber packaging structure are arranged in the cavity; the hot end of the thermoelectric refrigerator is arranged on the packaging base; the ceramic substrate is arranged at the cold end of the thermoelectric refrigerator; the thermistor and the optical fiber packaging structure are arranged on the ceramic substrate; the thermoelectric refrigerator and the thermistor are respectively electrically connected with the controller; the optical fiber packaging structure comprises a cuboid cover body and an optical fiber grating arranged in the cuboid cover body; the fiber grating is formed by a section of fiber with a Bragg grating or a phase-shift fiber grating; a bragg grating or a phase shifted fiber grating acts as a laser cavity for the fiber laser to operate. The fiber laser packaging device can ensure that the laser works at a constant temperature through the built-in thermoelectric refrigerator and the thermistor, thereby inhibiting the frequency thermal drift effect and ensuring the frequency stability of the light emitted by the laser.

Description

Fiber laser packaging hardware

Technical Field

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

Background

In recent years, the technology of fiber lasers is rapidly developed, the performance of the fiber lasers is continuously improved, and the application of the fiber lasers is more and more extensive.

Due to the advantages of small volume, narrow line width, convenient use and the like, the fiber laser is widely applied to the fields of fiber sensing, laser radar, high-resolution laser spectrum and the like. The application fields have high requirements on the reliability, structural stability and noise characteristics of the optical fiber laser. Bragg gratings or phase-shifted fiber gratings in a typical fiber laser are susceptible to environmental disturbances, which can severely degrade the performance of the fiber laser. Therefore, the further technical means is adopted to fixedly package the fiber grating in the fiber laser, and the optimization of the related packaging structure is of great significance.

The basic principle of the current general technology is to lead the optical fiber to pass through a glass tube, fix the grid region part of the optical fiber laser with the glass tube through two fixing points, and fix the glass on the metal tube of the outer sleeve. However, since metal or glass expands when the temperature rises, the length of the gate region of the fiber laser changes with the change of the temperature or vibration, and the frequency stability of the light emitted by the fiber laser is affected significantly.

Disclosure of Invention

The present application aims to solve the above problems and provide a fiber laser packaging apparatus.

The application provides a fiber laser packaging device, which comprises a packaging base and a packaging cover plate connected to the packaging base; a cavity is formed between the packaging base and the packaging cover plate; a ceramic substrate, a thermoelectric refrigerator, a thermistor and an optical fiber packaging structure are arranged in the cavity; the hot end of the thermoelectric refrigerator is arranged on the packaging base; the ceramic substrate is arranged at the cold end of the thermoelectric refrigerator; the thermistor and the optical fiber packaging structure are both arranged on the ceramic substrate; the thermoelectric refrigerator and the thermistor are respectively electrically connected with the controller; the optical fiber packaging structure comprises a cuboid cover body and an optical fiber grating arranged in the cuboid cover body; the fiber grating is formed by a section of fiber with a Bragg grating or a phase-shifting fiber grating; the Bragg grating or the phase-shifting fiber grating is used as a laser cavity for the fiber laser to work.

According to the technical scheme provided by some embodiments of the present application, the package base and the package cover plate are connected by any one of parallel seam welding, laser welding or glue bonding.

According to the technical scheme provided by some embodiments of the present application, the package base and the thermoelectric refrigerator, and the thermoelectric refrigerator and the ceramic substrate are fixedly connected by silver paste or by soldering of a prefabricated solder sheet.

According to the technical scheme provided by some embodiments of the application, the package base and the package cover plate are both made of kovar materials.

According to certain embodiments of the present disclosure, the ceramic substrate is an aluminum nitride ceramic substrate.

According to the technical scheme provided by certain embodiments of the application, the cuboid cover body is made of glass or quartz materials.

According to the technical scheme provided by some embodiments of the present application, the optical fiber packaged by the optical fiber packaging structure is a dual-port optical fiber or a single-port optical fiber.

Compared with the prior art, the beneficial effect of this application: the packaging device of the optical fiber laser isolates the laser cavity of the optical fiber laser from the external environment by arranging the packaging base and the packaging cover plate; the control of the internal temperature can be realized through the built-in thermoelectric refrigerator and the thermistor, and the fiber laser is ensured to work at a constant temperature, so that the frequency thermal drift effect of the fiber laser is inhibited, and the frequency stability of the light emitted by the fiber laser is ensured.

Drawings

Fig. 1 is a schematic structural diagram of a fiber laser packaging apparatus provided in an embodiment of the present application.

The text labels in the figures are represented as:

1. a package base; 2. packaging the cover plate; 3. a cavity; 4. a ceramic substrate; 5. a thermoelectric refrigerator; 6. a thermistor; 7. and (3) a grating packaging structure.

Detailed Description

The following detailed description of the present application is given for the purpose of enabling those skilled in the art to better understand the technical solutions of the present application, and the description in this section is only exemplary and explanatory, and should not be taken as limiting the scope of the present application in any way.

Referring to fig. 1, the present embodiment provides an optical fiber laser packaging apparatus, including a packaging base 1 and a packaging cover plate 2 connected to the packaging base 1, a cavity 3 is formed between the packaging base 1 and the packaging cover plate 2, a ceramic substrate 4, a thermoelectric refrigerator 5, a thermistor 6 and an optical fiber packaging structure 7 are arranged inside the cavity 3, the thermoelectric refrigerator 5 is fixed on the packaging base 1, and its hot end faces downward and its cold end faces upward, i.e. the hot end is fixedly connected to the packaging base 1, the ceramic substrate 4 is arranged at the cold end of the thermoelectric refrigerator 5, the thermistor 6 and the optical fiber packaging structure 7 are both arranged on the ceramic substrate 4, the thermoelectric refrigerator 5 and the thermistor 6 are respectively electrically connected to a controller (not shown) arranged outside the cavity 3 by way of base pins, so as to realize controllable internal temperature; the optical fiber packaging structure 7 comprises a cuboid cover body and an optical fiber grating arranged in the cuboid cover body; the fiber bragg grating and the cuboid cover body are connected through glue or a welding process; the fiber grating is formed by a section of fiber with a Bragg grating or a phase-shifting fiber grating; the Bragg grating or the phase-shifting fiber grating is used as a laser cavity for the fiber laser to work.

Preferably, the package base 1 and the package cover plate 2 are connected by any one of parallel seam welding, laser welding or glue bonding, so as to realize sealed connection and isolate the laser cavity of the fiber laser from the external environment.

Preferably, the package base 1 and the thermoelectric refrigerator 5, and the thermoelectric refrigerator 5 and the ceramic substrate 4 are fixedly connected by using silver paste (not shown). In other embodiments of the present application, the solder sheets can be soldered to the substrate.

Preferably, the package base 1 and the package cover 2 are both made of kovar material. In other embodiments of the present application, the package base 1 and the package cover 2 may be made of other metal materials with similar properties to kovar materials.

Preferably, the ceramic substrate 4 is an aluminum nitride ceramic substrate, and in other embodiments of the present application, a ceramic substrate having another composition and similar thermal conductivity to the aluminum nitride ceramic substrate may be used as the ceramic substrate 4.

Preferably, the cuboid housing is made of glass or quartz material.

Preferably, the optical fiber packaged by the optical fiber packaging structure 7 is a dual-port optical fiber or a single-port optical fiber. In this embodiment, a dual port fiber is used, i.e., the fiber enters from the left end and exits from the right end; in other embodiments of the present application, a single port fiber may be used, i.e., a fiber that enters from the left end and exits from the left end.

According to the optical fiber laser packaging device provided by the embodiment of the application, the laser cavity of the optical fiber laser is isolated from the external environment by arranging the packaging base 1 and the packaging cover plate 2; the control of the internal temperature can be realized through the built-in thermoelectric refrigerator 5 and the thermistor 6, the fiber laser is ensured to work at a constant temperature, the frequency thermal drift effect of the fiber laser is restrained, and the frequency stability of the light emitted by the fiber laser is ensured.

The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that there are no specific structures which are objectively limitless due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes can be made without departing from the principle of the present invention, and the technical features mentioned above can be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention in other instances, which may or may not be practiced, are intended to be within the scope of the present application.

Claims

1. The optical fiber laser packaging device is characterized by comprising a packaging base (1) and a packaging cover plate (2) connected to the packaging base (1); a cavity (3) is formed between the packaging base (1) and the packaging cover plate (2); a ceramic substrate (4), a thermoelectric refrigerator (5), a thermistor (6) and an optical fiber packaging structure (7) are arranged in the cavity (3); the hot end of the thermoelectric refrigerator (5) is arranged on the packaging base (1); the ceramic substrate (4) is arranged at the cold end of the thermoelectric refrigerator (5); the thermistor (6) and the optical fiber packaging structure (7) are both arranged on the ceramic substrate (4); the thermoelectric refrigerator (5) and the thermistor (6) are respectively electrically connected with a controller; the optical fiber packaging structure (7) comprises a cuboid cover body and an optical fiber grating arranged in the cuboid cover body; the fiber grating is formed by a section of fiber with a Bragg grating or a phase-shifting fiber grating; the Bragg grating or the phase-shifting fiber grating is used as a laser cavity for the fiber laser to work.

2. The fiber laser packaging device according to claim 1, wherein the package base (1) and the package cover plate (2) are connected by any one of parallel seam welding, laser welding or glue bonding.

3. The fiber laser packaging device according to claim 1, wherein the package base (1) and the thermoelectric refrigerator (5), and the thermoelectric refrigerator (5) and the ceramic substrate (4) are fixedly connected by silver paste or by soldering with a pre-fabricated solder sheet.

4. Fiber laser packaging arrangement according to claim 1, characterized in that the package base (1) and the package cover plate (2) are made of kovar material.

5. Fiber laser packaging arrangement according to claim 1, characterized in that the ceramic substrate (4) is an aluminum nitride ceramic substrate.

6. The fiber laser packaging arrangement according to claim 1, wherein the cuboid enclosure is made of glass or quartz material.

7. The fiber laser packaging device according to claim 1, wherein the optical fiber packaged by the fiber packaging structure (7) is a dual-port fiber or a single-port fiber.