All-Fiber Millijoule Energy and Nanoseconds Pulse Operation
of a High Beam Quality Multi-Stage Pulse-Pumped
Yb-Doped Amplifier Cascade¹

C. Zheng*, H. T. Zhang, W. Y. Cheng, M. Liu, P. Yan, and M. L. Gong*

State Key Laboratory of Tribology, Center for Photonics and Electronics, Department of Precision Instruments,
Tsinghua University, Beijing 100084, China

*e-mail: zhengc08@mails.tsinghua.edu.cn

Received October 13, 2011; in final form, October 26, 2011; published online February 6, 2012

Abstract—We report on an all fiber Master Oscillator Power Amplifier (MOPA) structured pulsed-pumped
fiber-amplifier seeded by laser diode and modulated by current with an output of several nanojoule energy at
100 Hz repetition rate. To suppress ASE, pulse-pumped technology was adopted in four stages of amplification.
By means of this technology, repetition could be adjusted freely without change of pump current which is dif-
ferent from continuous pump. 80 J output was achieved in 18 ns pulses in the 15 J amplification stage. More-
over, we achieved over 1.2 mJ/pulse with pulses of 10 ns between 1 Hz to 100 Hz repetition in the 30 m core
amplification stage with output beam quality of M² 1.4. Energy was limited by launched pump power.

DOI: 10.1134/S1054660X12030309

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