Abstract
The efficient generation of a 1.17-mJ laser pulse with 360 ps duration using
an ytterbium (Yb)-doped fiber amplifier chain seeded by a homemade mode-locked fiber
laser is demonstrated experimentally. A specially designed figure-of-eight fiber
laser acts as the seed source of a chirped-pulse amplification (CPA) system and
generates mode-locked pulses with hundreds of picosecond widths. Two kinds of
large-mode-area (LMA) double-clad Yb-doped fibers are employed to construct the
pre-amplifier and main amplifier. All of the adopted instruments help avoid severe
nonlinearity in fibers to raise sub-nanosecond pulse energy with acceptable
signal-to-noise ratio (SNR). The output spectrum of this fiber-based CPA system
shows that amplified spontaneous emission (ASE) is suppressed to better than 30 dB,
and the onset of stimulated Raman scattering is excluded.
© 2011 Chinese Optics Letters
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