Hundred-watt level average power CPA system with all-fiberized laser amplifiers based on CFBG stretcher and CVBG compressor

Abstract

We report on a novel fiber chirped-pulse amplification system with a hundred-watt level average power. All-fiberized laser amplifiers, a chirped fiber Bragg grating stretcher, and a chirped volume Bragg grating compressor make up the system. The chirped fiber Bragg gratings were inscribed in the experiment through the fabrication system built by ourselves, with the parameters fine-tuned during fabrication to match the spectrum after stretching to the source waveband and the spectral width of the chirped volume Bragg grating compressor. A 12 m-long photonic crystal fiber was also used to provide effective spectral bandwidth matching between the pre-amplifier and the chirped fiber Bragg gratings. Meanwhile, the gain fiber length of the amplifiers was suitably selected, and the overall system's spectral matching was achieved. As a result, a compressed average power of 111.4 W was obtained with a pulse duration of 1.5 ps, resulting in peak power of 4.1 MW. The proposed all-fiberized stretcher and amplifier structure significantly decrease the system's volume, increase the system's stability and dependability, and may be used in various applications.