Fiber bragg grating external cavity laser with temperature control function
By using thermistor and semiconductor refrigerator in the external cavity laser for precise temperature control, the frequency stability problem of FBG fiber grating under ambient temperature changes is solved, higher temperature and thermal stability is achieved, and the operation stability of the laser is improved.
Patent Information
- Application Number
- CN202323509483.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-21
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2033-12-21
AI Technical Summary
The prior art is difficult to achieve stable temperature and thermal stability of FBG fiber gratings in external cavity lasers, especially in the case of a large ambient temperature change rate, resulting in excessive frequency drift or frequency offset.
A fiber grating external cavity laser with temperature control function is designed, and the two semiconductor refrigerators are controlled respectively through the temperature feedback of the first and second thermistors, and the heat transfer is used to accurately control the semiconductor gain chip and fiber grating to avoid mutual interference.
The temperature stability and thermal stability of the fiber grating in the outer cavity laser are improved, frequency drift is reduced, and the operation stability of the laser is enhanced.
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of optical devices, in particular to an optical fiber grating external cavity laser with a temperature control function. Background Art
[0002] In an external cavity laser, a grating is usually used as a frequency selective element or optical filter. The temperature stability of the grating is crucial to the performance and stability of the external cavity laser. The specific design of the FBG grating can make it temperature sensitive. By measuring the frequency shift of the central wavelength of the FBG grating with temperature changes, the change of ambient temperature can be calculated.
[0003] Generally, FBG gratings require good temperature stability and a certain temperature operating range in temperature measurement. The existing technology cannot meet the stable ambient temperature requirements of FBG fiber gratings in external cavity lasers. When the ambient temperature change rate of the FBG grating is large, it will cause excessive frequency drift or frequency misalignment.
[0004] At the same time, the external cavity laser may be affected by heat during operation, such as temperature changes caused by the laser itself or heat sources in the surrounding environment. In this case, the grating needs to have good thermal stability to maintain its frequency stability and avoid excessive frequency drift. Utility Model Content
[0005] The utility model aims to provide an optical fiber grating external cavity laser with temperature control function.
[0006] In order to achieve the purpose of the utility model, the utility model provides a fiber Bragg grating external cavity laser with temperature control function, comprising a first semiconductor refrigerator, a second semiconductor refrigerator, a first heat sink, a second heat sink, a chip substrate, a semiconductor gain chip, a first thermistor, a second thermistor and an output optical fiber; the first heat sink is arranged on the first semiconductor refrigerator, the chip substrate is arranged on the first heat sink, the semiconductor gain chip and the first thermistor are arranged on the chip substrate, the input end of the output optical fiber is opposite to the output end of the semiconductor gain chip and receives laser; the second heat sink is arranged on the second semiconductor refrigerator, a fiber Bragg grating is prepared between the input end and the output end of the output optical fiber, the fiber Bragg grating is arranged on the second heat sink, the second thermistor is arranged on the second heat sink, and the semiconductor gain chip and the output optical fiber are arranged in a straight line along the optical path direction.
[0007] A further solution is that the external cavity laser also includes a lens fiber, which is connected to the output fiber. The lens fiber is located between the output end of the semiconductor gain chip and the fiber grating of the output fiber. The lens fiber is used to couple the laser output from the output end of the semiconductor gain chip into the output fiber.
[0008] A further solution is that the external cavity laser further includes a fixing member, the fixing member is arranged on the first heat sink, and the lens optical fiber is arranged on the fixing member.
[0009] A further solution is that the external cavity laser further includes a tube shell, and the first semiconductor refrigerator and the second semiconductor refrigerator are both arranged in the tube shell.
[0010] A further solution is that the first semiconductor refrigerator and the second semiconductor refrigerator are arranged separately.
[0011] A further solution is that the first heat sink and the second heat sink are arranged separately.
[0012] The beneficial effect of the utility model is that the temperature of the first and second thermistors is fed back to control the two semiconductor refrigerators respectively, and the two heat sinks are used to transfer heat respectively, so that the semiconductor gain chip and the fiber Bragg grating can be accurately controlled in temperature, and the semiconductor refrigerator and the heat sink are arranged separately, so that the temperature interference between the semiconductor gain chip and the fiber Bragg grating is avoided, thereby improving the temperature stability and thermal stability of the fiber Bragg grating in the external cavity laser, so as to improve the operating stability of the external cavity laser. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural diagram of an embodiment of the external cavity laser of the utility model.
[0014] Figure 2 It is a system block diagram of an embodiment of the external cavity laser of the utility model.
[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION
[0016] Reference Figure 1 to Figure 2The external cavity laser comprises a tube shell 10, a first semiconductor refrigerator 11, a second semiconductor refrigerator 12, a first heat sink 21, a second heat sink 22, a chip substrate 31, a semiconductor gain chip 311, a fixing member 32, a lens fiber 44, a first thermistor 51, a second thermistor 52, a lens fiber 44 and an output fiber 4. The first semiconductor refrigerator 11 and the second semiconductor refrigerator 12 are both arranged in the tube shell 10, the first heat sink 21 is arranged on the first semiconductor refrigerator 11 and forms heat conduction with the first semiconductor refrigerator 11, and the chip substrate 31 is arranged on the first heat sink 21 and form heat conduction, the semiconductor gain chip 311 and the first thermistor 51 are arranged on the chip substrate 31, the lens fiber 44 is connected to the output optical fiber 4, the lens fiber 44 is located between the output end of the semiconductor gain chip 311 and the fiber grating 43 of the output optical fiber 4, the input end 41 of the output optical fiber 4 is opposite to the output end of the semiconductor gain chip 311, the lens fiber 44 is used to couple the laser output from the output end of the semiconductor gain chip 311 into the output optical fiber 4, the fixing part 32 is arranged on the first heat sink 21, and the lens fiber 44 is arranged on the fixing part 32.
[0017] The second heat sink 22 is arranged on the second semiconductor refrigerator 12 and forms heat conduction. The output optical fiber 4 is provided with a fiber grating 43 between the input end 41 and the output end 42. The fiber grating 43 and the second thermistor 52 are arranged on the second heat sink 22 and form heat conduction. The semiconductor gain chip 311 and the output optical fiber 4 are arranged in a straight line along the optical path direction, and the first semiconductor refrigerator 11 and the second semiconductor refrigerator 12 are also arranged in a straight line along the optical path direction and are arranged separately. The first heat sink 21 and the second heat sink 22 are also arranged in a straight line along the optical path direction and are arranged separately. The semiconductor gain chip is used to generate gain laser, and the fiber grating is used to select the frequency of the laser, and the semiconductor gain chip and the fiber grating are precisely controlled by the semiconductor refrigerator, so that ultra-narrow line width laser can be output.
[0018] As can be seen from the above, in this case, the temperatures fed back by the first thermistor and the second thermistor are used to control the two semiconductor refrigerators respectively, and two heat sinks are used to transfer heat respectively, so that the semiconductor gain chip and the fiber Bragg grating can be accurately controlled in temperature, and the semiconductor refrigerator and the heat sink are arranged separately to avoid the temperature interference between the semiconductor gain chip and the fiber Bragg grating, thereby improving the temperature stability and thermal stability of the fiber Bragg grating in the external cavity laser, so as to improve the operating stability of the external cavity laser.
Claims
1. A fiber Bragg grating external cavity laser with temperature control function, characterized in that: It includes a first semiconductor refrigerator, a second semiconductor refrigerator, a first heat sink, a second heat sink, a chip substrate, a semiconductor gain chip, a first thermistor, a second thermistor and an output optical fiber; The first heat sink is disposed on the first semiconductor refrigerator, the chip substrate is disposed on the first heat sink, the semiconductor gain chip and the thermistor are disposed on the chip substrate, and the input end of the output optical fiber is opposite to the output end of the semiconductor gain chip and receives laser light; The second heat sink is arranged on the second semiconductor refrigerator, a fiber grating is prepared between the input end and the output end of the output optical fiber, the fiber grating is arranged on the second heat sink, the second thermistor is located on the second heat sink, and the semiconductor gain chip and the output optical fiber are arranged in a straight line along the optical path direction.
2. The external cavity laser according to claim 1, characterized in that: The external cavity laser also includes a lens fiber, which is connected to the output fiber and is located between the output end of the semiconductor gain chip and the fiber grating of the output fiber. The lens fiber is used to couple the laser output from the output end of the semiconductor gain chip into the output fiber.
3. The external cavity laser according to claim 2, characterized in that: The external cavity laser further comprises a fixing member, wherein the fixing member is arranged on the first heat sink, and the lens optical fiber is arranged on the fixing member.
4. The external cavity laser according to claim 1, characterized in that: The external cavity laser further comprises a tube shell, and the first semiconductor refrigerator and the second semiconductor refrigerator are both arranged in the tube shell.
5. The external cavity laser according to any one of claims 1 to 4, characterized in that: The first semiconductor refrigerator and the second semiconductor refrigerator are arranged separately.
6. The external cavity laser according to claim 5, characterized in that: The first heat sink and the second heat sink are arranged separately.