High-power narrow-linewidth fiber laser based on rayleigh scattering and working method thereof

A technology of fiber laser and Rayleigh scattering, which is applied in the direction of laser, laser parts, and laser using scattering effect, etc., can solve the problems that the doping concentration level cannot be further improved, the transmission loss increases, and the manufacturing process is complicated, so as to avoid stability Non-linearity and transmission loss issues, avoid nonlinear effects, good beam quality effect

Pending Publication Date: 2018-11-13
SHANDONG UNIV
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AI Technical Summary

Problems solved by technology

The method of segmented tapering is not only complicated in manufacturing process, but also the stability of the non-uniform optical fiber after tapering decreases, and the transmission loss increases
In order to accumulate stimulated Rayleigh scattering, inhomogeneous fibers on the order of hundreds of meters are usually used, which greatly limits the performance of lasers
[0005] The method of reducing the length of the gain fiber can lower the threshold value, but the doping concentration level of the commonly used silica matrix gain fiber cannot be further increased due to the concentration quenching effect of rare earth ions, so the pump absorption coefficient is generally biased. Low, reducing the length of the gain fiber will also reduce the conversion efficiency of the laser and affect its output power

Method used

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  • High-power narrow-linewidth fiber laser based on rayleigh scattering and working method thereof

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Embodiment 1

[0035] like figure 1 shown.

[0036] A high-power narrow-linewidth fiber laser based on Rayleigh scattering, including a pump laser 1, a wavelength division multiplexer 2, and YAG-SiO arranged along the optical path 2 Doped fiber 3, first fiber circulator 4, polarization controller 7, second fiber circulator 8, YAG-SiO 2 Optical fiber 9, variable optical attenuator 10 and Faraday rotating mirror 11; Described first optical fiber circulator 4 is also connected with high reflectivity fiber Bragg grating 5; The output end of described second optical fiber circulator 8 is also connected with fiber coupling Device 12, an output end of the fiber coupler 12 is connected with the wavelength division multiplexer 2, and the other output end of the fiber coupler 12 is the output end of the whole laser; the wavelength division multiplexer 2, YAG-SiO 2 The doped fiber 3, the first fiber circulator 4, the polarization controller 7, the second fiber circulator 8 and the fiber coupler 12 to...

Embodiment 2

[0044] The high-power narrow-linewidth fiber laser based on Rayleigh scattering as described in Example 1, further, the YAG-SiO 2 The doped fiber 3 is connected to the first port of the first fiber circulator 4; the high reflectivity fiber Bragg grating 5 is connected to the second port of the first fiber circulator 4; the polarization controller 7 is connected to the first fiber circulator 4 The third port is connected; the polarization controller 7 is connected to the first port of the second fiber circulator 8, and the YAG-SiO2 optical fiber 9 is connected to the second port of the second fiber circulator 8, and the fiber coupler 12 is connected with the third port of the second optical fiber circulator 8.

[0045] The operating wavelength of the first optical fiber circulator 4 and the second optical fiber circulator 8 is 1 μm; the insertion loss from the first port to the second port of the second optical fiber circulator 8 is 1.02dB; the second port of the second optical...

Embodiment 3

[0047] For the high-power narrow-linewidth fiber laser based on Rayleigh scattering described in Example 1, further, the 3dB bandwidth of the high-reflectivity fiber Bragg grating 5 is 0.2nm, and the reflectivity is 97%.

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Abstract

The invention relates to a high-power narrow-linewidth fiber laser based on rayleigh scattering and a working method thereof. The laser comprises a pump laser, a wavelength division multiplexer, a YAG-SiO2 doped fiber, a first fiber circulator, a polarization controller, a second fiber circulator, a YAG-SiO2 fiber, a variable optical attenuator and a faraday rotation mirror which are arranged along the light path. The first fiber circulator is also connected with high-reflectivity fiber Bragg gratings. The output end of the first fiber circulator is also connected with a fiber coupler. One output end of the fiber coupler is connected with the wavelength division multiplexer. The other output end of the fiber coupler is the output end of the whole laser. The wavelength division multiplexer,the YAG-SiO2 doped fiber, the first fiber circulator, the polarization controller, the second fiber circulator and the fiber coupler form a ring cavity together.

Description

technical field [0001] The invention relates to a high-power narrow-linewidth fiber laser based on Rayleigh scattering and a working method thereof, belonging to the technical field of fiber lasers. Background technique [0002] High-power narrow-linewidth single-frequency fiber laser can achieve high output power while ensuring that the laser has good temporal and spatial coherence, low noise, compact structure, and good beam quality. It is widely used in industrial production, scientific research, and national defense. have important applications. For example, high-power narrow-linewidth single-frequency fiber lasers can be used in beam synthesis, lidar, gravitational wave detection, optical fiber communication, nonlinear frequency conversion, photoelectric countermeasures and other fields. [0003] In the production process of high-power single-frequency fiber laser, due to the characteristics of small core area and long length of the fiber, it is easy to produce nonline...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/0941H01S3/30
CPCH01S3/06712H01S3/06716H01S3/06783H01S3/06791H01S3/0941H01S3/302
Inventor 刘兆军高悉宝丛振华谢永耀王上张行愚
Owner SHANDONG UNIV
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