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High efficient and narrow linewidth fiber laser based on fiber grating Fabry-Perot cavity |
Bo WU(), Yongzhi LIU, Qianshu ZHANG, Huimin YUE, Zhiyong DAI |
School of Opt-Electronic Information, University of Electronic Science and Technology of China |
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Abstract A high Er3+-doped narrow linewidth fiber laser based on fiber Bragg grating Fabry-Perot cavity was demonstrated. The spatial hole burning effect was restrained by a fiber Faraday rotator. Two short fiber Bragg grating Fabry-Perot cavities as narrow bandwidth filters discriminated and selected laser longitudinal modes efficiently. A stable single-frequency 1534.83 nm laser was acquired. Pumped by two 976 nm laser diodes and two-ended output, the fiber laser exhibited a 12 mW threshold. Total 39.5 mW output power and one end 22 mW output power were obtained at the maximum 145 mW pump power. Optical-optical efficiency was 27% and slope efficiency was 29.7%. The output power seemed to be saturated when pump power increased. The 3 dB linewidth of the laser was less than 7.5 kHz, measured by the delayed self-heterodyne method with 15 km monomode fiber. The high power narrow linewidth fiber laser can be used in high resolution fiber sensor systems.
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Keywords
laser technology
fiber laser
narrow linewidth
fiber grating Fabry-Perot cavity
high Er3+-doped fiber
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Corresponding Author(s):
WU Bo,Email:w_bo@sohu.com
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Issue Date: 05 September 2009
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