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

Chang Sun; Tingwu Ge; Na An; Kang Cao; Zhiyong Wang

doi:10.1117/1.OE.55.10.106116

20 October 2016 160 W high-power, high-efficiency, near-diffraction-limited beam quality all-fiber picosecond pulse laser

Chang Sun, Tingwu Ge, Na An, Kang Cao, Zhiyong Wang

Author Affiliations +

Optical Engineering, Vol. 55, Issue 10, 106116 (October 2016). https://doi.org/10.1117/1.OE.55.10.106116

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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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," Optical Engineering 55(10), 106116 (20 October 2016). https://doi.org/10.1117/1.OE.55.10.106116

Published: 20 October 2016

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KEYWORDS

Picosecond phenomena

Pulsed laser operation

Fiber lasers

Optical amplifiers

Fiber amplifiers

High power lasers

Laser systems engineering

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