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We demonstrate 25-fs laser pulse generation from a photonic crystal fiber (PCF) laser system, which consists of a high energy all normal dispersion mode-locked oscillator based on an ytterbium-doped large mode area PCF and a passive PCF-based grating-pair compressor. The oscillator directly delivers 314-nJ highly-chirped pulses with a duration of 1.32 ps at a repetition rate of 15.58 MHz, which can...
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