1.2 kW all-fiber narrow-linewidth picosecond MOPA system

Abstract

Achieving an all-fiber ultrafast system with above kW average power and mJ pulse energy is extremely challenging. This paper demonstrated a picosecond monolithic master oscillator power amplifier system at a 25 MHz repetition frequency with an average power of ~1.2 kW, a pulse energy of ~48 μJ, and a peak power of ~0.45 MW. The nonlinear effects were suppressed by adopting a dispersion stretched seed pulse (with a narrow-linewidth of 0.052 nm) and a multi-mode master amplifier with an extra-large mode area, then an ultimate narrow bandwidth of 1.32 nm and a moderately broadened pulse of ~107 ps were achieved.Meanwhile, the great spatio-temporal stability was verified experimentally, and no sign of transverse mode instability appeared even at the maximum output power. The system shown great power and energy capability with a sacrificed beam propagation product of 5.28

High-repetition-rate and High-power Efficient Picosecond Thin-disk Regenerative Amplifier

“…Researchers have made significant advancements in laser technology to overcome these challenges, resulting in the development of more efficient and sophisticated laser architectures. Notably, fiber master oscillator power amplifiers [ 7 , 8 ] , slab lasers [ 9 , 10 ] and thin-disk lasers (TDLs) [ 11 – 13 ] have emerged as noteworthy solutions, each of which offers a high surface-to-volume ratio for effective heat extraction. Among them, the TDL, with a thickness of sub-mm, stands out for its superior energy storage capacity and efficient 1D heat dissipation.…”