Beibei Wang, Zhigang Peng, Zhaochen Cheng, Xu Yan, Pu Wang
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Research on hundred-watt level megahertz femtosecond pulse laser based on rod-type photonic crystal fiber
A hundred-watt chirped pulse amplification (CPA) fiber laser system based on Yb-doped rod-type photonic crystal fiber (PCF) is demonstrated. The seed was an all-fiber dispersion-managed mode-locked oscillator based on chirped fiber bragg grating (CFBG) and semiconductor saturable absorber mirror (SESAM). The oscillator delivers 1.5 ps pulses at a repetition rate of 45 MHz. The output power from the oscillator was 0.9 mW and the central wavelength was 1032 nm. After pulse stretching, pulse picking and amplification, 151 W output power with repetition rate of 1 MHz was achieved by employing a home-made 85/260 μm PCF (Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences). After compression, laser pulses with duration of 616 fs and average power of 102.9 W were obtained. The single pulse energy and peak power were calculated to be 102.9 μJ and 167 MW respectively.
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