Lasers, Fiber Optics, and Communications

160 W high-power, high-efficiency, near-diffraction-limited beam quality all-fiber picosecond pulse laser

[+] Author Affiliations
Chang Sun, Tingwu Ge, Na An, Kang Cao, Zhiyong Wang

Beijing University of Technology, Institute of Laser Engineering, No. 100 Pingleyuan Street, Chaoyang, Beijing 100124, China

Opt. Eng. 55(10), 106116 (Oct 20, 2016). doi:10.1117/1.OE.55.10.106116
History: Received June 19, 2016; Accepted September 30, 2016
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Abstract.  We experimentally demonstrate a high-power, high-efficiency, near-diffraction-limited beam quality all-fiber picosecond pulse laser, which consists of a passively mode-locked seed laser and three-stage master power amplifiers. A repetition frequency multiplier and a high Yb-doped gain fiber with shorter length are utilized in the laser system to suppress the nonlinear effects and reduce the pulse broadening caused by dispersion. Moreover, the homemade light mode controllers based on a coiling and tapering fiber technique and the active fiber of the amplifier with a relatively small mode area are adopted to improve the beam quality. In addition, by experimentally adjusting the active fiber length, the optical conversion efficiency of the overall laser system can be optimized. Eventually, a 160 W high-power, high-efficiency, near-diffraction-limited picosecond pulse fiber laser is obtained, with the beam quality factor M2 at 1.12 and an optical conversion efficiency of the system of 75%.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Chang Sun ; Tingwu Ge ; Na An ; Kang Cao and Zhiyong Wang
"160 W high-power, high-efficiency, near-diffraction-limited beam quality all-fiber picosecond pulse laser", Opt. Eng. 55(10), 106116 (Oct 20, 2016). ; http://dx.doi.org/10.1117/1.OE.55.10.106116


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