PUMP laser

Abstract

The utility model discloses a PUMP laser, which 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 inside 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 utility model relates to the technical field of semiconductor optoelectronic devices, and particularly relates 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 technical types: optical (fiber) tomography analysis technology OCT, fiber optic 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, accounting for about 10% of the overall price. Currently, the most widely used FOS light source device is mainly the pump laser, and the FOS application directions assembled can be in fiber optic gyroscopes, bridge monitoring, coal mines, petrochemical and power systems, etc.

[0003] The pump laser has the advantages of high laser power, high coupling efficiency, narrow spectrum, high side mode suppression ratio, etc., and is widely used in optoelectronic devices on communication and sensing systems. Currently, pump lasers are mainly applied in fields such as fiber optic gyroscopes and fiber optic stress sensing, and 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 an external fiber grating to be affected by environmental stress or temperature to affect the grating spacing and then affect the laser transmission spectrum shape to detect environmental stress or temperature. While fiber optic gyroscopes require a stable laser output spectrum shape and are required to be unaffected by environmental stress or temperature, and the external fiber grating will inevitably be affected by environmental stress and temperature, thus affecting the accuracy of systems such as fiber optic gyroscopes. Summary of the Utility Model

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

[0005] To solve the above technical problem, the utility model adopts the following technical solutions:

[0006] A PUMP laser, comprising a tube shell, an internal temperature control component, a PUMP chip, and an optical fiber component. The internal temperature control component and the PUMP chip are encapsulated in the tube shell. The optical fiber component is coupled and aligned with the PUMP chip and passes out of the tube shell from the inside of the tube shell. The optical fiber component has a fiber grating part with a grating engraved on it. The PUMP laser further includes an optical fiber grating temperature control component for adjusting and controlling the temperature of the optical fiber grating part.

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

[0008] Part of the fiber grating is located inside the shell, and the internal temperature control component synchronously adjusts and controls the temperature of the PUMP die and the fiber grating part as the fiber grating temperature control component.

[0009] A heat conduction protection sleeve is provided inside the shell. The optical fiber component passes through the heat conduction protection sleeve, and the fiber grating part is located inside the heat conduction protection sleeve.

[0010] The heat conduction protection sleeve is a circular sleeve. The fiber grating part is suspended inside the heat conduction protection sleeve, and the axis of the fiber grating part coincides with the axis of the heat conduction protection sleeve.

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

[0012] Both ends of the heat conduction protection sleeve are adhesively fixed to the optical fiber component.

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

[0014] The internal temperature control component includes a cooler and a heat sink connected and installed on the cooler. Both the PUMP die and the heat conduction protection sleeve are connected and installed on the heat sink.

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

[0016] The PUMP die is connected and installed on the heat sink through a ceramic transition heat sink. The thermal conductivity of the ceramic transition heat sink is the same as that of the PUMP die. The internal temperature control component further includes a thermistor connected and installed on the ceramic transition heat sink.

[0017] Compared with the prior art, the advantages of the present utility model are as follows:

[0018] For the PUMP laser of the present utility model, a fiber grating temperature control component is provided, which can adjust and control the temperature of the fiber grating part through the fiber grating temperature control component, avoid the instability of the laser transmission spectrum caused by the influence of the ambient temperature on the fiber grating part, improve the stability of the laser transmission spectrum, improve the accuracy, and realize the stable output of the spectrum of the PUMP laser at different ambient temperatures. Description of the Drawings

[0019] Figure 1 It is the structural schematic diagram of the PUMP laser.

[0020] Figure 2 It is Figure 1 The enlarged structural schematic diagram at position A in

[0021] Figure 3 It is a schematic cross-sectional structure diagram of the bonding and fixing of optical fiber components.

[0022] Figure 4 It is a schematic cross-sectional structure diagram of the welding and fixing of optical fiber components.

[0023] Legend:

[0024] 1. Housing; 2. Internal temperature control component; 21. Refrigerator; 22. Heat sink; 23. Ceramic transition heat sink; 24. Metal heat conduction bracket; 25. Thermistor; 3. PUMP die; 4. Optical fiber component; 41. Fiber grating part; 42. Metallized part; 5. Thermal conduction protection sleeve. Specific implementation mode

[0025] The following further elaborates on the present utility model in detail in conjunction with the attached drawings and specific embodiments.

[0026] As Figure 1 and Figure 2 shown, the PUMP laser of this embodiment includes a housing 1, an internal temperature control component 2, a PUMP die 3, and an optical fiber component 4. The internal temperature control component 2 and the PUMP die 3 are encapsulated in the housing 1. The optical fiber component 4 is coupled and aligned with the PUMP die 3 and passes out of the housing 1 from the inside of the housing 1 to the outside of the housing 1. The optical fiber component 4 has a fiber grating part 41 with a grating engraved on it. The PUMP laser also includes an optical fiber grating temperature control component for adjusting and controlling the temperature of the fiber grating part 41. For this PUMP laser, by setting the optical fiber grating temperature control component, the temperature of the fiber grating part 41 can be adjusted and controlled through the optical fiber grating temperature control component, avoiding the instability of the laser transmission spectrum caused by the influence of the environmental temperature on the fiber grating part 41, improving the stability of the laser transmission spectrum, improving the accuracy, and realizing the stable output of the spectrum of the PUMP laser under different environmental temperatures.

[0027] In this embodiment, the fiber grating part 41 is located inside the housing 1, and the internal temperature control component 2 serves as the optical fiber grating temperature control component to synchronously adjust and control the temperatures of the PUMP die 3 and the fiber grating part 41. That is, by locating the fiber grating part 41 inside the housing 1, the internal temperature control component 2 that originally adjusts and controls the temperature of the PUMP die 3 in the PUMP laser is used to simultaneously adjust and control the temperature of the PUMP die 3. There is no need to add a new temperature control component, which can improve the simplicity and compactness of the structure, reduce the volume, lower the cost, and reduce the manufacturing and assembly difficulty and control difficulty. At the same time, since the fiber grating part 41 is located inside the housing 1, it can also avoid the instability of the spectrum output caused by the influence of environmental stress.

[0028] In this embodiment, a heat-conducting protective sleeve 5 is provided inside the package 1. The optical fiber assembly 4 passes through the heat-conducting protective sleeve 5, and the fiber grating part 41 is located inside 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. 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-conducting protective sleeve 5 is a circular sleeve. The fiber grating part 41 is suspended inside the heat-conducting protective sleeve 5, and the axis of the fiber grating part 41 coincides with the axis of the heat-conducting protective sleeve 5. The distance and the heat-conducting gap between the outer walls around the fiber grating part 41 and the inner walls around the heat-conducting protective sleeve 5 are uniform. When controlling the temperature, heat is evenly transferred through the heat-conducting protective sleeve 5 and the heat-conducting gap, making the temperature of the fiber grating part 41 more uniform. The influence of temperature on the fiber grating part 41 is minimized, and the spectral output stability can be further improved.

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

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

[0032] In this embodiment, the internal temperature control component 2 includes a cooler 21 and a heat sink 22 connected and installed on the cooler 21. Both the PUMP die 3 and the heat-conducting protective sleeve 5 are connected and installed on the heat sink 22, and the temperature of the PUMP die 3 and the heat-conducting protective sleeve 5 can be accurately adjusted and controlled.

[0033] In this embodiment, the heat-conducting protective sleeve 5 is connected and installed on the heat sink 22 through a metal heat-conducting bracket 24. Specifically, the metal heat-conducting bracket 24 is welded to the heat sink 22, and the heat-conducting protective sleeve 5 is fixedly connected to the metal heat-conducting bracket 24. On 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-conducting bracket 24 and the heat sink 22, and it is convenient to adjust the coupling point between the optical fiber assembly 4 and the PUMP die 3 according to the actual situation. On the other hand, if the coupling point displacement deviation is found after the metal heat-conducting bracket 24 is welded and fixed, the offset can also be corrected by laser welding points.

[0034] In this embodiment, the PUMP die 3 is connected and mounted 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 that of the PUMP die 3, which can ensure the stability of the PUMP die 3. At the same time, the ceramic transition heat sink 23 is made of non-conductive ceramic material, and the sputtering gold plating process can be used on the ceramic transition heat sink 23 to make electrode patterns for powering the PUMP die 3, which is beneficial to simplifying the structure and saving costs. The internal temperature control component 2 further includes a thermistor 25 connected and mounted on the ceramic transition heat sink 23, which is convenient for combining with the control circuit to control the operation of the cooler 21, so as to accurately control the temperature of the PUMP die 3 and the fiber grating part 41.

[0035] The optical fiber component 4 of this embodiment is a wedge lens optical fiber, and the wedge lens of the wedge lens optical fiber is coupled and aligned with the PUMP die 3.

[0036] The above is only the 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 of this technology, the improvements and transformations 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 housing (1), an internal temperature control component (2), a PUMP die (3), and an optical fiber component (4). The internal temperature control component (2) and the PUMP die (3) are encapsulated within the housing (1). The optical fiber component (4) is coupled and aligned with the PUMP die (3) and passes through from the inside of the housing (1) to the outside of the housing (1). The optical fiber component (4) has an optical fiber grating portion (41) engraved with a grating, and is characterized in that: The PUMP laser further 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 inside the package (1), and the internal temperature control component (2) synchronously adjusts and controls the temperatures of the PUMP die (3) and the fiber grating part (41) as the fiber grating temperature control component.

3. The PUMP laser according to claim 2, characterized in that: A heat conduction protection sleeve (5) is provided inside the package (1), the optical fiber component (4) passes through the heat conduction protection sleeve (5), and the fiber grating part (41) is located inside the heat conduction protection sleeve (5).

4. The PUMP laser according to claim 3, wherein: The heat conduction protection sleeve (5) is a circular sleeve, the fiber grating part (41) is suspended inside the heat conduction protection sleeve (5), and the axis of the fiber grating part (41) coincides with the axis of the heat conduction protection sleeve (5).

5. The PUMP laser according to claim 4, characterized in that: Both ends of the heat conduction protection sleeve (5) are fixedly connected to the optical fiber component (4).

6. The PUMP laser according to claim 5, wherein: Both ends of the heat conduction protection sleeve (5) are adhesively fixed to the optical fiber component (4).

7. The PUMP laser according to claim 5, wherein: The optical fiber component (4) has two metallized parts (42) respectively located at both ends of the fiber grating part (41), and the two metallized parts (42) are respectively welded to both ends of the heat conduction protection sleeve (5).

8. The PUMP laser according to any one of claims 3 to 7, characterized in that: The internal temperature control component (2) includes a cooler (21) and a heat sink (22) connected and installed on the cooler (21), and both the PUMP die (3) and the heat conduction protection sleeve (5) are connected and installed on the heat sink (22).

9. The PUMP laser according to claim 8, characterized in that: The heat conduction protection sleeve (5) is connected and installed on the heat sink (22) through a metal heat conduction bracket (24).

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

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