178-W picosecond green laser with active beam-pointing stabilization

Abstract

Picosecond lasers with high average power and high beam quality have been widely used for precision processing and space exploration. In this study, we report a high-power picosecond green laser using a multistage Yb-doped rod-shaped photonic crystal fiber as an amplifier combined with a beam combination. The single amplification module achieves a 1,030 nm laser output of 146.8 W, and the maximum second harmonic generation (SHG) power is 92 W with a frequency conversion efficiency of 63.5%. The combined beam of the two SHGs resulted in a final output of 178 W with a repetition frequency of 24.07 MHz, pulse width of 50.1 ps, and beam quality factor of M2 = 1.16. Furthermore, an adaptive filter control method of a two-axis fast-steering mirror was applied to suppress the beam jitter to up to 45 Hz.

10 kHz repetition rate picosecond green laser for high-accuracy satellite ranging

“…It consists of a lens, a frequency doubling crystal, a dichroic mirror, and a highly reflective mirror. The frequency doubling crystal is selected as LBO crystal, which has a wide transmission range, good optical uniformity, high damage threshold, good mechanical properties, and high frequency doubling conversion efficiency [23,24]. LBO adopts a combination of angular phase matching and temperature phase matching.…”