| Summary: | In this paper we experimentally demonstrate a femtosecond all-polarization- maintaining laser amplifier in an all-fiber scheme, which consists of a mode-locked oscillator and a two-stage amplifier. A hybrid method of dispersion compensation is proposed based on a dispersion compensation fiber and two fiber Bragg gratings with different group velocity dispersion. The output pulse from the amplifier is 57 fs with average power of 150 mW and repetition rate of 60 MHz, corresponding to peak power of 38.6 kW. By evaluation of pulse shaping, one third of group velocity dispersion in the amplifier was compensated by the pair of gratings, and the remained amount compensated by the dispersion compensation fiber.
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