All-polarization-maintaining (PM) fiber oscillator based on nonlinear amplifying loop mirror (NALM) modelocking has important applications for chirped pulse amplification systems. In this paper, we report an all-PM-fiberintegrated femtosecond chirped pulse amplification (CPA) system operating at 1030 nm, which consists of a NALM oscillator, an ytterbium-doped amplifier and a chirped volume Bragg grating (CVBG) compressor. The laser produces linearly polarized, linearly chirped pulses that can be recompressed down to 711 fs, corresponding to 95% compression efficiency. All-PM NALM fiber oscillator combined with CVBG compressor is a promising method for CPA system due to its extremely compact and robust architecture.
We report on a nanosecond all-fiber MOPA with ultra-high repetition rate (tens of MHz), which is seeded by a semiconductor saturable absorber mirror (SESAM) mode-locking fiber oscillator at 1064 nm. Ultra-high repetition rate of tens of MHz is realized by reducing fiber length in laser cavity. By using single-mode fiber stretcher with total length of 16 km, pulse width of mode locking laser pulse can be broadened from 28 ps to 1~7 ns. The maximum average power is achieved to be 54 W with pulse duration of 1.3 ns and repetition rate of 27.7 MHz. To the best of our knowledge, this is the first demonstration on an ultra-high repetition-rate (tens of MHz) nanosecond all-fiber MOPA based on a SESAM passively mode-locking fiber oscillator.
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