Dynamics of Yb-Doped Double Clad Pulsed Fiber Amplifier
Based
on Slow Motion Dynamic Rate Equations¹

M. Liu, H. T. Zhang, P. Yan, M. L. Gong*, C. Zheng, and K. Meng

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

*e-mail: mlgong@mail.tsinghua.edu.cn

Received January 30, 2012; in final form, April 30, 2012; published online July 9, 2012

Abstract—A special slow motion dynamic equations are presented especially adapt to the fiber laser analyze
in which a long working cycle simulation and acute state changing are both needed. It can greatly save the cal-
culation time while keep the output result relatively accurate. Then the dynamics of nanosecond high energy
low repetition rate pulsed fiber amplifier is analyzed which indicate that most energy is wasted by means of self
emission between pulses and the amplified self emission (ASE) is no longer the main cause of energy depletion
with proper pulsed pump. Hence, unless a relatively large input seed source is used, the light conversion effi-
ciency of a low repetition rate pulsed laser is usually much lower than the quantum efficiency even with a pulsed
pump.

DOI: 10.1134/S1054660X12080130

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