Anti-vibration and time-frequency-stable single-frequency fiber laser for aerospace navigation

Abstract

The invention discloses an anti-vibration and time-frequency-stable single-frequency fiber laser for aerospace navigation. The anti-vibration and time-frequency-stable single-frequency fiber laser comprises a single-frequency fiber laser resonant cavity, a resonant cavity packaging base, a temperature control module, a wavelength division multiplexer, a pumping source and an optical isolator, the device is simple in structure, low in cost and easy to implement. Firstly, a pumping source pumps a single-frequency optical fiber laser resonant cavity, rare earth ions in a high-gain optical fiber generate particle beam inversion, and stimulated radiation signal light is generated; secondly, the working temperature of the single-frequency fiber laser resonant cavity is accurately controlled through a temperature control module, and under the feedback action of the resonant cavity, signal light oscillates back and forth for multiple times and is amplified for multiple times; meanwhile, axial prestress is applied to the two ends of the single-frequency fiber laser resonant cavity, so that the whole single-frequency fiber laser resonant cavity is converted into a tightened state from a loose free state, adhesive dispensing and fixing are carried out at the positions where the optical fibers outside the resonant cavity and the resonant cavity packaging base are arranged, and the tension inside the resonant cavity is remarkably improved through introduction of the axial prestress.

Description

Technical Field

[0001] The invention belongs to the field of optical fiber lasers, in particular to a vibration-resistant and time-frequency-stable single-frequency optical fiber laser for aerospace and navigation. Background Art

[0002] Single-frequency fiber laser refers to the output in the form of single longitudinal mode (single frequency) oscillation in the laser resonant cavity. Its characteristic is that the laser spectrum line width is very narrow, which can reach up to 10 -8 nm, in addition, it also has the characteristics of high beam quality and long coherence length, and has important application prospects in the fields of fiber optic sensing, coherent lidar, high-power coherent synthesis, gravitational wave detection, etc. However, in practical applications of aerospace and navigation such as space coherent velocity measurement, deep space / deep sea navigation, airborne lidar, shipborne laser communication, etc., single-frequency fiber lasers are easily affected by the external environment. External sounds or mechanical vibrations will disturb the single-frequency fiber laser resonant cavity. This disturbance will not only degrade the stability of the laser's center frequency, introduce additional light intensity fluctuations, but also cause the cavity length change to produce a certain modulation of the laser frequency, causing the laser line width to be broadened. Therefore, it is necessary to focus on breaking through the key anti-vibration technology from the perspective of resonant cavity design and packaging, so as to effectively reduce the sensitivity of the resonant cavity to external environmental vibrations and achieve single-frequency fiber laser output with stable time-frequency characteristics.

[0003] For the study of the anti-vibration characteristics of fiber lasers, the traditional methods of isolating vibrations are active and passive vibration reduction. Passive vibration reduction uses spring structures or buffer materials, while the active method uses displacement actuators (such as piezoelectric ceramics and electromagnetic coils, etc.) to control the movement of the platform where the optical resonant cavity is located, thereby achieving the purpose of offsetting external vibrations. These two vibration isolation methods can filter out most of the high-frequency signals of vibrations, but it is difficult to handle vibrations in the low-frequency band. At the same time, such high-precision passive or active control systems are costly, difficult to reduce in size, complex in structure, and difficult in process. For the development of high-stability fiber lasers, it is particularly important to explore cavities with vibration-immune structures or vibration-immune support methods.

[0004] In recent years, scientists have proposed various resonant cavity structures or support methods with vibration immunity characteristics, thereby reducing the sensitivity of the optical resonant cavity to external environmental vibrations. Related research work includes: ADLudlow et al. designed a vertically placed optical resonant cavity in the shape of an American football, supporting the resonant cavity at the middle end face of the cavity. When there is vertical vibration in the outside world, the relative distance between the cavity mirrors remains unchanged, effectively reducing the change of the cavity length caused by external vibration. However, this method only targets vertical vibrations. When lateral vibrations occur, the optical resonant cavity will still be disturbed. At the same time, this method uses a spatial structure, the overall size is relatively large, and the temperature control is difficult, which is not conducive to the temperature tuning of the laser. The German PTB research institute adopts a self-balancing structure base design. The three linkage balls under the base can automatically adjust the translation effect to avoid the support point being affected by uneven horizontal stress, thereby reducing the vibration sensitivity in any direction in space. However, when the base placement platform vibrates, the optical resonant cavity placed on the self-balancing structure base level will cause corresponding vibrations with the vibration of the platform. In addition, both of the above methods require precision machining and strict assembly, which increases the technical complexity and operational difficulty, and is difficult to apply to complex and harsh field environments. Therefore, it is necessary to design a simpler and more convenient optical resonant cavity that can effectively reduce the vibration sensitivity in all directions to solve the above problems. Summary of the invention

[0005] The invention provides a vibration-resistant and time-frequency-stable single-frequency optical fiber laser for aerospace and navigation, so as to solve the defects in the prior art.

[0006] The present invention is achieved through the following technical solutions: A vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and navigation, comprising a single-frequency fiber laser resonant cavity, a resonant cavity packaging base, a temperature control module, a wavelength division multiplexer, a pump source, and an optical isolator; The single-frequency fiber laser resonant cavity is used to realize resonance and generate single-frequency fiber laser; The resonant cavity packaging base is used to package and fix the single-frequency fiber laser resonant cavity, and apply axial tensile prestress to improve the anti-vibration performance of the resonant cavity; The temperature control module is arranged in the single-frequency fiber laser resonant cavity to provide a stable temperature environment and ensure the frequency stability of the resonant cavity; The common end of the wavelength division multiplexer is connected to the single-frequency fiber laser resonant cavity, and is used to couple the transmission pump light into the single-frequency fiber laser resonant cavity, and couple the output of the single-frequency fiber laser; The pump source is connected to the pump end of the wavelength division multiplexer to provide pump energy to achieve population inversion and laser oscillation in the single-frequency fiber laser resonant cavity; The input end of the optical isolator is connected to the signal end of the wavelength division multiplexer to ensure the unidirectional transmission of the single-frequency fiber laser and avoid the interference of return light and external light on the stable operation of the single-frequency fiber laser resonant cavity.

[0007] As described above, in the vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and navigation, the external optical fiber of the single-frequency fiber laser resonant cavity and the two ends of the resonant cavity packaging base are fixed by glue spotting, and the curing glue between the resonant cavity packaging base and the external optical fiber of the single-frequency fiber laser resonant cavity is any one of ultraviolet curing glue, heat curing glue, epoxy resin glue, anaerobic glue, and instant glue, or a mixture of any two or more of them in any proportion.

[0008] As described above, a vibration-resistant and time-frequency stable single-frequency fiber laser for aerospace and navigation, the single-frequency fiber laser resonant cavity is any one of a distributed Bragg reflection (DBR) resonant cavity or a distributed feedback (DFB) resonant cavity; the distributed Bragg reflection resonant cavity is formed by fusing a pair of fiber gratings at both ends of a high-gain optical fiber, and the reflectivity of the fiber grating is 10% to 99.9%; the distributed feedback resonant cavity is formed by writing a phase-shift grating on a high-gain optical fiber, and the reflectivity of the phase-shift grating is 70% to 99.9%.

[0009] The vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and navigation as described above, wherein the high-gain fiber is a rare-earth ion-doped fiber, the core material of the rare-earth ion-doped fiber is any one of phosphate glass, germanate glass, tellurate glass, silicate glass, and fluoride glass, or a mixture of any two or more of them in any proportion, and the rare-earth ion-doped fiber is Yb 3+ , Er 3+ 、Tm 3+ 、Ho 3+ 、Nd 3+ , Pr 3+ 、Eu 3+ 、Ce 3+ Cr 3+ Any one of them or a mixture of any two or more of them in any proportion.

[0010] As described above, in the vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and navigation, the pre-tensioning force applied by the single-frequency fiber laser resonator at both ends of the axial direction is 0.01~100N.

[0011] In the vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and navigation as described above, the resonant cavity packaging base is made of any one of metal, ceramic, glass, resin, and plastic.

[0012] As described above, in the vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and navigation, the temperature control module includes a cooling element and a heating element, the cooling element is a semiconductor cooling plate, and the heating element is a resistance heating plate or a thin film heating plate.

[0013] The vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and navigation as described above, wherein the pump source is any one of a semiconductor laser, a fiber laser, and a solid-state laser.

[0014] The vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and navigation as described above, wherein the wavelength division multiplexer is a reflection-operating wavelength division multiplexer or a transmission-operating wavelength division multiplexer.

[0015] In the vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and navigation as described above, the optical isolator is a single-stage isolator or a double-stage isolator.

[0016] The advantages of the present invention are: the present invention has a simple structure, low cost and is easy to implement. First, the pump source pumps the single-frequency fiber laser resonant cavity, and the rare earth ions in the high-gain fiber undergo particle beam inversion to generate stimulated radiation signal light; second, the temperature control module accurately controls the working temperature of the single-frequency fiber laser resonant cavity, and under the feedback of the resonant cavity, the signal light oscillates back and forth multiple times and is amplified multiple times; at the same time, by applying 0.01~100 The axial prestress of N causes the entire single-frequency fiber laser resonant cavity to change from a relaxed free state to a stretched state, and the optical fiber outside the resonant cavity is fixed to the resonant cavity packaging base by glue. The introduction of the axial prestress significantly increases the tension inside the resonant cavity, weakens the effects of string vibration, microbend and standing wave on the optical fiber caused by external environmental vibration, thereby reducing the elastic deformation of the single-frequency fiber laser resonant cavity caused by radial and axial disturbances, and further reduces the laser frequency fluctuation caused by the change in the resonant cavity length, while effectively overcoming the laser intensity jitter caused by the loss fluctuation in the cavity, and ultimately improving the vibration resistance of the single-frequency fiber laser, and realizing the single-frequency fiber laser output with stable time-frequency characteristics. The present invention can meet the urgent needs of the aerospace and navigation fields for vibration-resistant and time-frequency stable single-frequency fiber lasers. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 The single-frequency fiber laser of the present invention is compared with the vibration tolerance test results of foreign lasers in the X-axis dimension with or without prestress; Figure 3 The single-frequency fiber laser of the present invention is compared with the vibration tolerance test results of foreign lasers in the Y-axis dimension with or without prestress; Figure 4 The present invention is a single-frequency fiber laser with or without prestress and a vibration tolerance test comparison result with foreign lasers in the Z-axis dimension.

[0019] Figure numerals: 1. single-frequency fiber laser resonant cavity; 2. resonant cavity packaging base; 3. temperature control module; 4. pump source; 5. wavelength division multiplexer; 6. optical isolator. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figure 1 As shown, a vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and navigation includes a single-frequency fiber laser resonant cavity 1, a resonant cavity packaging base 2, a temperature control module 3, a wavelength division multiplexer 5, a pump source 4, and an optical isolator 6; The single-frequency fiber laser resonant cavity 1 is used to realize resonance and generate single-frequency fiber laser; The resonant cavity packaging base 2 is used to package and fix the single-frequency fiber laser resonant cavity 1, and apply axial tensile prestress to improve the anti-vibration performance of the resonant cavity; The temperature control module 3 is arranged in the single-frequency fiber laser resonant cavity 1 to provide a stable temperature environment and ensure the frequency stability of the resonant cavity; The common end of the wavelength division multiplexer 5 is connected to the single-frequency fiber laser resonant cavity 1, and is used to couple the transmission pump light into the single-frequency fiber laser resonant cavity 1, and couple the output of the single-frequency fiber laser; The pump source 4 is connected to the pump end of the wavelength division multiplexer 5 to provide pump energy to achieve population inversion and laser oscillation in the single-frequency fiber laser resonant cavity 1; The input end of the optical isolator 6 is connected to the signal end of the wavelength division multiplexer 5 to ensure the unidirectional transmission of the single-frequency fiber laser and avoid the interference of the return light and external light on the stable operation of the single-frequency fiber laser resonant cavity 1.

[0022] Specifically, the external optical fiber of the single-frequency fiber laser resonant cavity 1 described in this embodiment is fixed to the two ends of the resonant cavity packaging base 2 by glue (such as Figure 1 As shown, both points (a) and (b) are glue points), the curing glue between the resonant cavity packaging base 2 and the external optical fiber of the single-frequency fiber laser resonant cavity 1 is any one of ultraviolet curing glue, thermal curing glue, epoxy resin glue, anaerobic glue, instant glue, or a mixture of any two or more of them in any proportion.

[0023] Specifically, the single-frequency fiber laser resonant cavity 1 described in this embodiment is any one of a distributed Bragg reflection (DBR) resonant cavity or a distributed feedback (DFB) resonant cavity; the distributed Bragg reflection resonant cavity is formed by fusing a pair of fiber gratings at both ends of a high-gain optical fiber, and the reflectivity of the fiber grating is 10%~99.9%; the distributed feedback resonant cavity is formed by writing a phase-shift grating on a high-gain optical fiber, and the reflectivity of the phase-shift grating is 70%~99.9%.

[0024] More specifically, the high-gain optical fiber described in this embodiment is a rare-earth ion-doped optical fiber, the core material of which is any one of phosphate glass, germanate glass, tellurate glass, silicate glass, and fluoride glass, or a mixture of any two or more of them in any proportion. The rare-earth ion-doped optical fiber is Yb 3+ , Er 3+ 、Tm 3+ 、Ho 3+ 、Nd 3+ , Pr 3+ 、Eu 3+ 、Ce 3+ Cr 3+ Any one of them or a mixture of any two or more of them in any proportion.

[0025] More specifically, the pre-tension applied to the single-frequency fiber laser resonant cavity 1 of this embodiment at both ends of the axial direction is 0.01-100 N.

[0026] More specifically, the resonant cavity packaging base 2 described in this embodiment is made of any one of metal, ceramic, glass, resin, and plastic.

[0027] Furthermore, the temperature control module 3 described in this embodiment includes a cooling element and a heating element, wherein the cooling element is a semiconductor cooling sheet, and the heating element is a resistance heating sheet or a thin film heating sheet.

[0028] Furthermore, the pump source 4 described in this embodiment is any one of a semiconductor laser, a fiber laser, and a solid laser.

[0029] Furthermore, the wavelength division multiplexer 5 described in this embodiment is a reflection-operating wavelength division multiplexer or a transmission-operating wavelength division multiplexer.

[0030] Furthermore, the optical isolator 6 described in this embodiment is a single-stage isolator or a double-stage isolator.

[0031] Embodiment: A vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and navigation, comprising a single-frequency fiber laser resonant cavity 1, a resonant cavity packaging base 2, a temperature control module 3, a pump source 4, a wavelength division multiplexer 5, and an optical isolator 6. The single-frequency fiber laser resonant cavity 1 is a DBR resonant cavity structure, and a broadband fiber grating and a narrowband fiber grating are respectively connected to the two ends of a high-gain optical fiber to form a single-frequency fiber laser resonant cavity 1; the two ends of the external optical fiber of the single-frequency fiber laser resonant cavity 1 are respectively fixed by glue (such as Figure 1 As shown, both point (a) and point (b) are glue points); a temperature control module 3 is set in the single-frequency fiber laser resonant cavity 1 for precise temperature control; the pump end of the wavelength division multiplexer 5 is connected to the pump source 4, and the common end of the wavelength division multiplexer 5 is connected to the single-frequency fiber laser resonant cavity 1. The pump light generated by the pump source 4 is input through the pump end of the wavelength division multiplexer 5, and then coupled to the high-gain optical fiber through the fiber grating for pumping, and a single-frequency fiber laser is generated in the single-frequency fiber laser resonant cavity 1. The signal end of the wavelength division multiplexer 5 is connected to the input end of the optical isolator 6, and the single-frequency fiber laser finally generated is output through the output port of the optical isolator 6.

[0032] The high-gain optical fiber used as the laser working medium in this embodiment is an ytterbium-doped phosphate glass optical fiber. The ytterbium ion doping concentration in the core of the phosphate optical fiber is 5.0×10 20 ions / cm 3, its use length is 1.2 cm; the central wavelength of the broadband fiber Bragg grating is 1040 nm, the 3 dB bandwidth of its reflection spectrum is 0.3 nm, and the reflectivity of its central wavelength is 99%; the central wavelength of the narrowband fiber Bragg grating is 1040 nm, the 3 dB bandwidth of its reflection spectrum is 0.08 nm, and the reflectivity of its central wavelength is 70%; the broadband fiber Bragg grating, the ytterbium-doped phosphate glass fiber and the narrowband fiber Bragg grating are combined to form a single-frequency fiber laser resonant cavity 1; by applying an axial prestress of 0.1 N at both ends of the single-frequency fiber laser resonant cavity 1, the entire single-frequency fiber laser resonant cavity 1 is transformed from a relaxed free state to a stretched state, and epoxy resin glue is used to glue and fix the two ends of the external optical fiber of the single-frequency fiber laser resonant cavity 1 (such as Figure 1 As shown, both points (a) and (b) are dispensing points). The resonant cavity packaging base 2 made of steel has good wrapping properties for the single-frequency fiber laser resonant cavity 1, can fix and protect the single-frequency fiber laser resonant cavity 1, and selects the cooling element of the resonant cavity temperature control module 3 as a semiconductor refrigeration plate, and selects the heating element of the resonant cavity temperature control module 3 as a thin film heating plate, so as to achieve precise temperature control of the entire single-frequency fiber laser resonant cavity 1, and the control accuracy is less than ±0.1 ° C; at the same time, a semiconductor laser pump source 4 with an operating wavelength of 980 nm is selected, and its pump output power is 250 mW. The pumping method adopts backward pumping, that is, the pump source 4 injects pump light, which is coupled into the narrow-band fiber grating through the wavelength division multiplexer 5 (a reflection-working wavelength division multiplexer is selected), and then input into the core of the ytterbium-doped phosphate glass fiber in the single-frequency fiber laser resonant cavity 1. The signal light oscillates back and forth many times under the feedback of the front and rear cavity mirrors, and finally achieves a maximum output power of 30 mW and a relative intensity noise of <-120 The single-frequency fiber laser of dB / Hz is outputted through the output port of the optical isolator 6 (double-stage isolator is selected).

[0033] The frequency fluctuation of the laser was monitored during operation, and in the ±11.5° swing test, the frequency fluctuation amplitude of the laser was reduced by 66.7%.

[0034] Vibration tests were conducted to compare the vibration acceleration tolerance of self-made lasers without prestress and with prestress, as well as foreign single-frequency fiber lasers. The acceleration tolerance was determined by the dual criteria of laser power fluctuation (≤1%) and frequency fluctuation (≤1 MHz). The results are shown in the figure below. Figure 2-Figure 4 As shown, through the effect of prestress, the vibration acceleration tolerance performance of the single-frequency fiber laser of the present invention is significantly improved in the three dimensions of X, Y, and Z, especially the y-axis and z-axis reach the 5g level, which is far superior to foreign lasers, and significantly improves the adaptability of the laser in the vibration environment of the aviation system.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and marine applications, characterized by: It includes a single-frequency fiber laser resonant cavity, a resonant cavity packaging base, a temperature control module, a wavelength division multiplexer, a pump source and an optical isolator; The single-frequency fiber laser resonant cavity is used to realize resonance and generate single-frequency fiber laser; The resonant cavity packaging base is used to package and fix the single-frequency fiber laser resonant cavity, and apply axial tensile prestress to improve the anti-vibration performance of the resonant cavity; The temperature control module is arranged in the single-frequency fiber laser resonant cavity to provide a stable temperature environment and ensure the frequency stability of the resonant cavity; The common end of the wavelength division multiplexer is connected to the single-frequency fiber laser resonant cavity, and is used to couple the transmission pump light into the single-frequency fiber laser resonant cavity, and couple the output of the single-frequency fiber laser; The pump source is connected to the pump end of the wavelength division multiplexer to provide pump energy to achieve population inversion and laser oscillation in the single-frequency fiber laser resonant cavity; The input end of the optical isolator is connected to the signal end of the wavelength division multiplexer to ensure the unidirectional transmission of the single-frequency fiber laser and avoid the interference of return light and external light on the stable operation of the single-frequency fiber laser resonant cavity.

2. A vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and marine use according to claim 1, characterized in that: The external optical fiber of the single-frequency fiber laser resonant cavity and the two ends of the resonant cavity packaging base are fixed by glue respectively, and the curing glue between the resonant cavity packaging base and the external optical fiber of the single-frequency fiber laser resonant cavity is any one of ultraviolet curing glue, heat curing glue, epoxy resin glue, anaerobic glue, instant glue, or a mixture of any two or more in any proportion.

3. The vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and marine use according to claim 1, characterized in that: The single-frequency fiber laser resonant cavity is any one of a distributed Bragg reflection resonant cavity or a distributed feedback resonant cavity; the distributed Bragg reflection resonant cavity is formed by fusing a pair of fiber gratings at both ends of a high-gain optical fiber, and the reflectivity of the fiber grating is 10% to 99.9%; the distributed feedback resonant cavity is formed by writing a phase-shift grating on a high-gain optical fiber, and the reflectivity of the phase-shift grating is 70% to 99.9%.

4. The vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and marine use according to claim 3, characterized in that: The high-gain optical fiber is a rare earth ion-doped optical fiber, the core material of which is any one of phosphate glass, germanate glass, tellurate glass, silicate glass, and fluoride glass, or a mixture of any two or more of them in any proportion. The rare earth ion-doped optical fiber is Yb 3+ , Er 3+ 、Tm 3+ 、Ho 3+ 、Nd 3 + , Pr 3+ 、Eu 3+ 、Ce 3+ Cr 3+ Any one of them or a mixture of any two or more of them in any proportion.

5. The vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and marine use according to claim 1, characterized in that: The pre-tensioning force applied by the single-frequency fiber laser resonant cavity at both ends of the axial direction is 0.01~100N.

6. The vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and marine use according to claim 1, characterized in that: The resonant cavity packaging base is made of any one of metal, ceramic, glass, resin and plastic.

7. The vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and marine use according to claim 1, characterized in that: The temperature control module comprises a cooling element and a heating element. The cooling element is a semiconductor cooling sheet, and the heating element is a resistance heating sheet or a thin film heating sheet.

8. The vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and marine use according to claim 1, characterized in that: The pump source is any one of a semiconductor laser, a fiber laser, and a solid laser.

9. The vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and marine use according to claim 1, characterized in that: The wavelength division multiplexer is a reflection working type wavelength division multiplexer or a transmission working type wavelength division multiplexer.

10. The vibration-resistant and time-frequency-stable single-frequency fiber laser for aerospace and marine use according to claim 1, characterized in that: The optical isolator is a single-stage isolator or a double-stage isolator.

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