PUMP laser

Abstract

A PUMP laser disclosed by the present invention comprises a tube shell, an internal temperature control assembly, a PUMP tube core and an optical fiber assembly, the internal temperature control assembly and the PUMP tube core are packaged in the tube shell, the optical fiber assembly is coupled and aligned with the PUMP tube core and penetrates out of the tube shell from the interior of the tube shell, and the optical fiber assembly is provided with an optical fiber grating part engraved with a grating. The PUMP laser further comprises a fiber bragg grating temperature control assembly used for adjusting and controlling the temperature of the fiber bragg grating part. The PUMP laser has the advantages that the stability of a laser transmission spectrum shape can be improved, the precision is improved, and stable spectrum output at different environment temperatures is realized.

Description

Technical Field

[0001] The invention relates to the technical field of semiconductor optoelectronic devices, and in particular to a PUMP laser. Background Art

[0002] The application development of fiber optic sensors (FOS) can be roughly divided into four major directions according to the current application hotspots and technology types: optical (fiber) tomography analysis technology OCT, optical fiber intelligent materials, fiber optic gyroscopes and inertial navigation systems, and conventional industrial engineering sensors. In fiber optic sensors, the light source is one of the key components and can account for 10% of the overall price. At present, the most widely used FOS light source devices are mainly pump lasers. The application directions of the assembled FOS can be in fiber optic gyroscopes, bridge monitoring, coal mines, petrochemicals, and power systems.

[0003] Pump lasers have the advantages of high laser power, high coupling efficiency, narrow spectrum, and high side mode suppression ratio. They are widely used in optoelectronic devices in communication and sensor systems. At present, pump lasers are mainly used in the fields of fiber optic gyroscopes and fiber optic stress sensing. They are one of the most important factors affecting the accuracy of these systems and are an irreplaceable core part of the system. Among them, the principle of fiber optic stress sensing is to use the external fiber grating to detect environmental stress or temperature by affecting the spacing of the grating to affect the laser transmission spectrum. Fiber optic gyroscopes require stable laser output spectrum and are not affected by environmental stress or temperature. External fiber gratings will inevitably be affected by environmental stress and temperature, thus affecting the accuracy of fiber optic gyroscopes and other systems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a PUMP laser which can improve the stability of the laser transmission spectrum, improve the accuracy, and achieve stable spectral output under different ambient temperatures.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A PUMP laser comprises a tube shell, an internal temperature control component, a PUMP tube core and an optical fiber component, wherein the internal temperature control component and the PUMP tube core are encapsulated in the tube shell, the optical fiber component is coupled and aligned with the PUMP tube core and passes from the inside of the tube shell to the outside of the tube shell, the optical fiber component has a fiber grating part engraved with a grating, and the PUMP laser also includes a fiber grating temperature control component for adjusting and controlling the temperature of the fiber grating part.

[0007] As a further improvement of the above technical solution:

[0008] The fiber grating part is located in the tube shell, and the internal temperature control component serves as the fiber grating temperature control component to synchronously adjust and control the temperature of the PUMP tube core and the fiber grating part.

[0009] A heat-conducting protective sleeve is arranged in the tube shell, the optical fiber assembly passes through the heat-conducting protective sleeve, and the optical fiber grating part is located in the heat-conducting protective sleeve.

[0010] The heat conductive protective sleeve is a circular sleeve, the fiber grating part is suspended in the heat conductive protective sleeve, and the axis of the fiber grating part coincides with the axis of the heat conductive protective sleeve.

[0011] Both ends of the heat conductive protection sleeve are fixedly connected to the optical fiber assembly.

[0012] The two ends of the heat conductive protection sleeve are glued and fixed to the optical fiber assembly.

[0013] The optical fiber assembly has two metallized parts respectively located at two ends of the optical fiber grating part, and the two metallized parts are respectively welded to two ends of the heat conductive protection sleeve.

[0014] The internal temperature control component includes a refrigerator and a heat sink connected and installed on the refrigerator, and the PUMP tube core and the thermal conductive protection sleeve are both connected and installed on the heat sink.

[0015] The heat conductive protection sleeve is connected and installed on the heat sink through a metal heat conductive bracket.

[0016] The PUMP tube core is connected and installed on the heat sink through a ceramic transition heat sink. The thermal conductivity of the ceramic transition heat sink is consistent with the thermal conductivity of the PUMP tube core. The internal temperature control component also includes a thermistor connected and installed on the ceramic transition heat sink.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] The PUMP laser of the present invention is provided with a fiber grating temperature control component, and the temperature of the fiber grating part can be adjusted and controlled by the fiber grating temperature control component to avoid the fiber grating part being affected by the ambient temperature and causing the laser transmission spectrum to be unstable. The stability of the laser transmission spectrum can be improved, the accuracy can be improved, and the PUMP laser can achieve stable spectral output under different ambient temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the structural principle diagram of the PUMP laser.

[0020] Figure 2 for Figure 1 Enlarged structural diagram at A in the middle.

[0021] Figure 3 It is a schematic diagram of the cross-sectional structure of the optical fiber components being glued and fixed to each other.

[0022] Figure 4 The cross-sectional structure diagram of the optical fiber components being welded and fixed to each other is shown.

[0023] Legend:

[0024] 1. Shell and tube; 2. Internal temperature control component; 21. Refrigerator; 22. Heat sink; 23. Ceramic transition heat sink; 24. Metal thermal conductive bracket; 25. Thermistor; 3. PUMP tube core; 4. Optical fiber component; 41. Fiber Bragg grating part; 42. Metallized part; 5. Thermal conductive protection sleeve. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 and Figure 2 As shown, the PUMP laser of this embodiment includes a tube shell 1, an internal temperature control component 2, a PUMP tube core 3 and an optical fiber component 4. The internal temperature control component 2 and the PUMP tube core 3 are encapsulated in the tube shell 1. The optical fiber component 4 is coupled and aligned with the PUMP tube core 3 and passes from the inside of the tube shell 1 to the outside of the tube shell 1. The optical fiber component 4 has a fiber grating portion 41 engraved with a grating. The PUMP laser also includes a fiber grating temperature control component for adjusting and controlling the temperature of the fiber grating portion 41. The PUMP laser is provided with a fiber grating temperature control component, and the temperature of the fiber grating portion 41 can be adjusted and controlled by the fiber grating temperature control component to avoid the fiber grating portion 41 being affected by the ambient temperature and causing the laser transmission spectrum to be unstable, which can improve the stability of the laser transmission spectrum and improve the accuracy, so as to achieve the PUMP laser's stable spectrum output under different ambient temperatures.

[0027] In this embodiment, the fiber grating part 41 is located in the tube shell 1, and the internal temperature control component 2 serves as a fiber grating temperature control component to synchronously adjust and control the temperature of the PUMP tube core 3 and the fiber grating part 41. That is, the fiber grating part 41 is located in the tube shell 1, and the internal temperature control component 2 of the PUMP laser that originally adjusts and controls the temperature of the PUMP tube core 3 is used to simultaneously adjust and control the temperature of the PUMP tube core 3. No new temperature control components are needed, which can improve the simplicity and compactness of the structure, reduce the volume, reduce costs, and reduce the difficulty of manufacturing, assembly and control. At the same time, the fiber grating part 41 is located in the tube shell 1, which can also avoid the instability of the spectral output due to environmental stress.

[0028] In this embodiment, a heat-conducting protective sleeve 5 is provided in the tube shell 1, the optical fiber assembly 4 passes through the heat-conducting protective sleeve 5, and the fiber grating part 41 is located in the heat-conducting protective sleeve 5. On the one hand, the heat-conducting protective sleeve 5 can prevent the fiber grating part 41 from being damaged by the outside world, and on the other hand, the heat-conducting protective sleeve 5 has good heat transfer performance, which is convenient for accurate temperature control. Preferably, the heat-conducting protective sleeve 5 is a metal sleeve.

[0029] In this embodiment, the heat conductive protective sleeve 5 is a circular sleeve, and the fiber grating part 41 is suspended in the heat conductive protective sleeve 5, and the axis of the fiber grating part 41 coincides with the axis of the heat conductive protective sleeve 5. The spacing and heat conductive gaps between the outer walls of the fiber grating part 41 and the inner walls of the heat conductive protective sleeve 5 are uniform, so that heat is evenly transferred through the heat conductive protective sleeve 5 and the heat conductive gaps during temperature control, so that the temperature of the fiber grating part 41 is more uniform, and the fiber grating part 41 is least affected by temperature, which can further improve the stability of spectral output.

[0030] In this embodiment, both ends of the heat conductive protective sleeve 5 are fixedly connected to the optical fiber assembly 4, so that the optical fiber grating part 41 remains fixed relative to the heat conductive protective sleeve 5 without position change and deformation, ensuring stable and reliable operation.

[0031] In this embodiment, Figure 3 As shown, the optical fiber assembly 4 uses a non-metallized optical fiber, and both ends of the thermal conductive protective sleeve 5 are glued and fixed to the optical fiber assembly 4. In other embodiments, such as Figure 4 As shown, the optical fiber assembly 4 may also have two metallized parts 42 respectively located at the two ends of the optical fiber grating part 41, and the two metallized parts 42 are respectively welded to the two ends of the thermal conductive protective sleeve 5. For example, the metallized parts 42 are welded and fixed to the thermal conductive protective sleeve 5 by using gold-tin solder.

[0032] In this embodiment, the internal temperature control component 2 includes a refrigerator 21 and a heat sink 22 connected and installed on the refrigerator 21. The PUMP tube core 3 and the thermal protective sleeve 5 are both connected and installed on the heat sink 22, which can accurately adjust and control the temperature of the PUMP tube core 3 and the thermal protective sleeve 5.

[0033] In this embodiment, the heat conductive protection sleeve 5 is connected and installed on the heat sink 22 through the metal heat conductive bracket 24. Specifically, the metal heat conductive bracket 24 is welded on the heat sink 22, and the heat conductive protection sleeve 5 is fixedly connected to the metal heat conductive bracket 24. Under the premise of ensuring the heat conduction efficiency and temperature control accuracy, on the one hand, it is convenient to adjust the connection position of the metal heat conductive bracket 24 and the heat sink 22, and it is convenient to adjust the coupling point of the optical fiber assembly 4 and the PUMP core 3 according to the actual situation. On the other hand, if the coupling point is found to be displaced after the metal heat conductive bracket 24 is welded and fixed, it can also be corrected by laser welding.

[0034] In this embodiment, the PUMP core 3 is connected and installed on the heat sink 22 through the ceramic transition heat sink 23. The thermal conductivity of the ceramic transition heat sink 23 is consistent with the thermal conductivity of the PUMP core 3, which can ensure the stability of the PUMP core 3. At the same time, the ceramic transition heat sink 23 is a non-conductive ceramic material. The sputtering gold plating process can be used on the ceramic transition heat sink 23 to make an electrode pattern used as an electrode for powering the PUMP core 3, which is conducive to simplifying the structure and saving costs. The internal temperature control component 2 also includes a thermistor 25 connected and installed on the ceramic transition heat sink 23, which is convenient for controlling the operation of the refrigerator 21 in combination with the control circuit, thereby accurately controlling the temperature of the PUMP core 3 and the fiber grating part 41.

[0035] The optical fiber component 4 of the present embodiment is a wedge-shaped lens optical fiber, and the wedge-shaped lens of the wedge-shaped lens optical fiber is coupled to the PUMP core 3 .

[0036] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and changes obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A PUMP laser, comprising a tube shell (1), an internal temperature control component (2), a PUMP tube core (3) and an optical fiber component (4), wherein the internal temperature control component (2) and the PUMP tube core (3) are encapsulated in the tube shell (1), the optical fiber component (4) is coupled and aligned with the PUMP tube core (3) and passes from the inside of the tube shell (1) to the outside of the tube shell (1), and the optical fiber component (4) has a fiber grating portion (41) engraved with a grating, characterized in that: The PUMP laser also includes a fiber grating temperature control component for adjusting and controlling the temperature of the fiber grating part (41).

2. The PUMP laser according to claim 1, characterized in that: The fiber grating part (41) is located in the tube shell (1), and the internal temperature control component (2) acts as the fiber grating temperature control component to synchronously adjust and control the temperature of the PUMP tube core (3) and the fiber grating part (41).

3. The PUMP laser according to claim 2, characterized in that: A heat-conducting protective sleeve (5) is provided in the tube shell (1), the optical fiber assembly (4) passes through the heat-conducting protective sleeve (5), and the optical fiber grating part (41) is located in the heat-conducting protective sleeve (5).

4. The PUMP laser according to claim 3, characterized in that: The heat conductive protective sleeve (5) is a circular sleeve, the optical fiber grating part (41) is suspended in the heat conductive protective sleeve (5), and the axis of the optical fiber grating part (41) coincides with the axis of the heat conductive protective sleeve (5).

5. The PUMP laser according to claim 4, characterized in that: Both ends of the heat-conductive protective sleeve (5) are fixedly connected to the optical fiber assembly (4).

6. The PUMP laser according to claim 5, characterized in that: Both ends of the heat conductive protective sleeve (5) are glued and fixed to the optical fiber assembly (4).

7. The PUMP laser according to claim 5, characterized in that: The optical fiber assembly (4) has two metallized parts (42) respectively located at two ends of the optical fiber grating part (41), and the two metallized parts (42) are respectively welded to two ends of the heat conductive protective sleeve (5).

8. The PUMP laser according to any one of claims 3 to 7, characterized in that: The internal temperature control component (2) comprises a refrigerator (21) and a heat sink (22) connected and mounted on the refrigerator (21), and the PUMP tube core (3) and the thermal conductive protection sleeve (5) are both connected and mounted on the heat sink (22).

9. The PUMP laser according to claim 8, characterized in that: The heat conductive protective sleeve (5) is connected and mounted on the heat sink (22) via a metal heat conductive bracket (24).

10. The PUMP laser according to claim 8, characterized in that: The PUMP tube core (3) is connected and installed on the heat sink (22) through a ceramic transition heat sink (23), and the thermal conductivity of the ceramic transition heat sink (23) is consistent with the thermal conductivity of the PUMP tube core (3). The internal temperature control component (2) also includes a thermistor (25) connected and installed on the ceramic transition heat sink (23).

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