We have demonstrated a photonic crystal fiber-based regenerative amplifier at $1.078\mu \mathrm{m}$ . The input signal pulse energy is $20\mathrm{pJ}$ in a $12\mathrm{ns}$ pulse at a $3\mathrm{kHz}$ repetition rate. At $8.6\mathrm{W}$ of input pump power, the amplified output pulse energy is $157\mu \mathrm{J}$ , yielding a gain of $69\mathrm{dB}$ . To our knowledge, this is the highest gain achieved in a fiber-based regenerative amplifier to date at any wavelength.

© 2009 Optical Society of America

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