J. J. Wanga, Z. H. Huanga, b, D. P. Xua, *, Y. Denga, H. H. Lina, and R. Zhanga
a Laser Fusion Research Center, China Academy of Engineering Physics, P.O. Box 919–988, Mianyang, 621900 China
b Department of Engineering Physics, Tsinghua University, Beijing, 100084 China
*e-mail: xudangpeng@yahoo.com.cn
Received September 17, 2011; in final form, September 25, 2011; published online December 28, 2011
Abstract—Polarization-maintaining fiber amplifier using ytterbium-doped single-mode fiber (SMF) is pro-
posed. A 45 Faraday rotator mirror (FRM) and a polarization independent fiber loop circulator (FLC) with
polarization-maintaining fiber (PMF) pigtails are used to realize double-pass amplification and birefringence
self-compensation. Arbitrary state of polarization (SOP) such as the linear polarization and elliptical polariza-
tion can be maintained. Polarization-maintaining amplification of phase modulated pulse with this amplifier is
experimentally demonstrated while introducing little intensity modulation itself.
DOI: 10.1134/S1054660X12020193
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