Photonic Crystal Rod-Based High-Performance Ultrafast Fiber Laser System

In this paper, we innovatively conduct a Porro prism-based beam pointing stability promotion technique research and realize a high-performance rod-type photonic crystal fiber-based chirped pulse amplification (CPA) system, mainly including a frequency-reduced all-fiber pre-amplification stage, photonic crystal rod-based main amplification stage, and 1600 lines/mm transmission grating-pair compressor. Laser output with average power of 50 W, repetition rates of 500 kHz, pulse energy of 100 mu J, pulse duration of 830 fs, beam quality of M-2<1.3, power fluctuation of 0.55% root mean square, and beam pointing drift of 19 mu rad/degrees C over 8 h is realized. The high-performance laser system has an enormous application potential in fundamental research and precision manufacturing fields.