A 2 [mu]m band low-noise narrow-linewidth single-frequency fiber laser

A fiber laser, low-noise technology, used in lasers, phonon exciters, laser components, etc., can solve the problems of failing to achieve extremely low noise and extremely narrow linewidth output characteristics, and not considering the optimization selection problem. Avoid random perturbations, reduce frequency noise and intensity noise, narrow linewidth effects

Inactive Publication Date: 2019-01-04
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, the above two patents did not consider the optimal selection of the same-band pump wavelength and the influence of the intensity noise of the pump source

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  • A 2 [mu]m band low-noise narrow-linewidth single-frequency fiber laser

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[0018] Below in conjunction with the accompanying drawings, the present invention will be further described through specific embodiments. It should be noted that the claimed scope of the present invention is not limited to the scope expressed by the embodiments.

[0019] like figure 1 , the 2μm-band low-noise narrow-linewidth single-frequency fiber laser based on a noise-suppressed co-band pump source provided by the present invention includes a broadband fiber Bragg grating 1, a highly doped gain fiber 2, a narrow-band fiber Bragg grating 3, a resonant cavity A temperature control module 4 , a wavelength division multiplexer 5 , a co-band pump source 6 , a first optical isolator 7 , a pump source intensity noise suppression module 8 , and a second optical isolator 9 . The structural relationship between the components is: broadband fiber Bragg grating 1, highly doped gain fiber 2 and narrow-band fiber Bragg grating 3 are sequentially connected to form a DBR single-frequency l...

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Abstract

A 2 [mu]m band low-noise narrow-linewidth single-frequency fiber laser is provided, which comprises a single-frequency laser resonant short cavity, a resonant cavity temperature control module, a wavelength division multiplexer, a co-band pumping source, a pumping source intensity noise suppression module and an optical isolator. The invention uses a laser with small difference between the workingwavelength and the laser signal wavelength as a co-band pumping source, uses an intensity noise suppression module to suppress the noise of the pumping source, and then uses a low-noise pumping source to pump the 2 [mu]m single-frequency laser resonant short cavity. Finally, single frequency fiber laser with low noise, narrow linewidth, and the working band of 2 [mu]m is output from the cavity. The laser provided by the invention has the advantages of all-optical fiber structure, excellent noise performance, extremely narrow laser linewidth, high conversion efficiency, simple structure, etc.,and can be used for atmospheric measurement, laser radar, biomedical, and realizing laser output in 3-5 [mu]m band as a pump source of an optical parametric oscillator (OPO) and the like.

Description

technical field [0001] The invention belongs to the technical field of fiber lasers, and in particular relates to a single-frequency fiber laser with 2 μm band, low noise and narrow line width. Background technique [0002] 2μm band (mainly concentrated in 1.7~2.1μm) single-frequency fiber laser has a single longitudinal mode output form, and has the advantages of narrow spectral linewidth, good coherence, low noise, and compact structure. It is used in high-resolution spectroscopy, laser radar, Atmospheric measurement, biomedicine, optical parametric oscillator (OPO) pump source and other fields have certain application value. However, some applications also require single-frequency lasers to have low noise and extremely narrow linewidth performance. For example, differential absorption radar requires consideration of the extremely narrow width of the absorption band of the substance molecules to be detected, while coherent Doppler wind radar is based on coherent The detec...

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Application Information

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IPC IPC(8): H01S3/067H01S3/094
CPCH01S3/06708H01S3/0675H01S3/094042
Inventor 杨昌盛徐善辉甘久林冯洲明黄振鹏杨中民
Owner SOUTH CHINA UNIV OF TECH
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