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Narrow linewidth laser output method based on micro-groove fiber

An output method and micro-groove technology, applied in the laser field, can solve the problems of difficult gain accumulation, weak signal, and inability to achieve single-frequency operation, and achieve the effects of achieving Rayleigh gain accumulation, improving signal strength, and simple structure.

Active Publication Date: 2018-11-02
ZHEJIANG NORMAL UNIVERSITY
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Problems solved by technology

However, the Brillouin gain bandwidth in the fiber is relatively wide (about 20MHZ). If the fiber is too long, there will be multiple laser modes in the Brillouin gain spectrum range (20MHZ), which will form a random mode hopping phenomenon, and cannot achieve stable single-frequency run
Therefore, limited by the length of the fiber, it is not easy to form gain accumulation in the resonator, and the signal is weak

Method used

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  • Narrow linewidth laser output method based on micro-groove fiber
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  • Narrow linewidth laser output method based on micro-groove fiber

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Embodiment Construction

[0018] Such as Figure 1a with Figure 1b As shown, this embodiment includes a 980nm pump laser 1, a wavelength division multiplexer 2, an erbium-doped optical fiber 3 with a length of 2 meters to 10 meters, a three-port circulator 4, a section of micro-groove optical fiber 5, a Variable optical attenuator 6, a fiber Bragg grating 7 with a center wavelength of 1548.839nm, and a 1*2 coupler 8;

[0019] A specific method for realizing narrow linewidth laser output includes the following steps:

[0020] (1) Select the micro-groove fiber 5 used to realize the ultra-narrow linewidth fiber laser, the micro-groove fiber is made by ordinary single-mode fiber 9 through femtosecond laser micromachining, and the femtosecond laser is used on the single-mode fiber Two symmetrical grooves 5-1 with a depth of 6-7 microns are written on the surface, and 20-22 pairs of micro-groove areas are formed on the common single-mode optical fiber through multiple writing operations. The micro-groove ...

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Abstract

The invention discloses a micro groove fiber-based narrow linewidth laser output method. A fiber grating serves as a wavelength selection device, an erbium-doped fiber serves as a gain medium, the micro groove fiber is adopted for realizing laser linewidth compression, and narrow linewidth laser output is realized. The method of the invention can be applied to fields such as distributed fiber vibration sensing, gas detection, environment monitoring and scientific research, and the structure is simple and the cost is low.

Description

technical field [0001] The invention belongs to the field of laser technology, and in particular relates to a narrow-linewidth laser output method based on a micro-groove optical fiber. Background technique [0002] Narrow linewidth single longitudinal mode laser has the advantages of ultra-long coherence length and extremely low phase noise, and has broad application prospects in the fields of optical fiber sensing, optical fiber communication, lidar, and distributed oil pipeline detection. [0003] At present, the ways to realize single-frequency narrow linewidth output of fiber laser mainly include: 1. Short cavity method based on distributed feedback fiber Bragg grating. The advantage of this method is that the laser structure is compact and the laser wavelength is stable; the disadvantage is that a highly doped fiber is required as the gain medium, the manufacturing process of the distributed feedback fiber Bragg grating is complicated, and the output laser power is ver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/30H01S3/067H01S3/10
CPCH01S3/06708H01S3/06716H01S3/06791H01S3/10H01S3/302
Inventor 陈达如王晓亮李海涛
Owner ZHEJIANG NORMAL UNIVERSITY
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