J, 3 ns Phase-Modulated Laser Pulse from Ytterbium-Doped Polarization-Maintaining Large-Mode-Area Fiber Amplifier1
Z. H. Huanga, b, Y. Denga, *, D. P. Xua, J. Wanga, H. Lina, R. Zhanga, and X. C. Tiana
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: youaremyfire@sina.com
Received February 18, 2012; published online June 12, 2012
Abstract—In the current inertial confinement fusion laser drivers, integrated fiber front-end is widely applied
to generate the phase-modulated, linearly polarized laser pulses with an output energy of several nano-joules.
In this contribution, we design an amplifier with polarization-maintaining optical components. The amplifica-
tion of the phase-modulated 3 ns, 0.24 nm pulse is experimentally demonstrated in the ytterbium-doped large-
mode-area (11 
m-diameter) fiber amplifier. The pulse energy is amplified to around 4 J which is free of pulse
distortion and stimulated Brillouin scattering. The modulation degree after optimal compensation of waveplates
is less than 6%. The output mode field is diffraction-limited.
DOI: 10.1134/S1054660X12070043
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