High-power chirped pulse amplification based on Yb-doped Rod-type PCF and nonlinear amplifying loop mirror oscillator

摘要

We report a high-power chirped pulse amplification (CPA) based on nonlinear amplifying loop mirror (NALM) oscillatorand Yb-doped rod-type photonic crystal fiber (PCF). An all-polarization-maintaining NALM mode-locked fiber oscillatorwas used providing an average power of 9.4 mW, a pulse duration of 5.3 ps at the repetition rate of 21 MHz. After pulsestretching, selection and amplification, an average power of 120 W with the pulse duration of 145 ps at repetition rate of4.2 MHz has been achieved. The pulse duration is compressed to 14 ps using a pair of reflective gratings coated by goldfilm. In order to prevent the damage of the gratings, the compressed average power is limited to 51 W. The compressedpulse average power can be further improved by using transmissive gratings coated by dielectric film.