All-Fiber Picoseconds MOPA Laser
with a Narrow Spectrum Output¹

Y. Lei, H. W. Chen, H. Chen, J. Hou*, and J. B. Chen**

College of Optoelectric Science and Engineering, National University of Defense Technology,
Changsha 410073, China

*e-mail: houjing25@sina.com
**e-mail: kdchenjinbao@yahoo.com.cn

Received April 27, 2012; in final form, April 30, 2012; published online August 1, 2012

Abstract—we report an all-fiber picoseconds MOPA laser with a narrow spectrum output in this paper. The
repetition rate of the seed source is increased to ~1 GHz with a unique all-fiber device to suppress nonlinear
effects, and a small core gain fiber is used in the power amplifier to support the less transverse mode. Three
cascaded amplifiers are adopted to amplify the signal light, and the maximum output power is 30 W with an
optical conversion efficiency of 73.9%. The 6 dB spectral linewidth just extends from 0.89 nm of the seed to
1.34 nm at the max output.

DOI: 10.1134/S1054660X1209006X

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