Compact 15 mJ Fiber–Solid Hybrid Hundred-Picosecond Laser Source for Laser Ablation on Copper

We report on a millijoule-level fiber–solid hybrid hundred-picosecond laser system with stable performance and compact structure. The is based master oscillator power amplifier structure containing an all-fiber oscillator, quasi-continuous-wave side-pumped Nd:YAG regenerative amplifier, double-pass amplifier. By using the filtering effect of fiber Bragg grating dispersion characteristics single-mode stretcher, spectrum broadening caused by self-phase modulation effectively suppressed. Thus, gain linewidth Yb-doped seed source amplifiers accurately matched. reason for thermally induced depolarization in solid-state theoretically analyzed, more flexible compensation adopted experiment. Furthermore, pulse energy 14.58 mJ width 228 ps achieved at 500 Hz repetition rate. central wavelength 1064.1 nm 3 dB bandwidth 0.47 nm. beam quality factors horizontal vertical directions are 1.49 1.51, respectively. This has simple stability 1.9%. high this confirmed latter theoretical simulation copper ablation. It very practical material processing laser-induced damage.