High-power, fiber-pumped, picosecond green source based on BiB3O6

We report a stable, high-power, high-repetition-rate, picosecond green source at 532 nm in a compact and practical design based on single-pass second-harmonic generation (SHG) of a mode-locked ytterbium fiber laser in the nonlinear material BiB 3 O 6 . Using a 10-mm-long crystal, we have generated as much as 5.4 W of picosecond green radiation at 80 MHz for a fundamental average power of 14.2 W at a single-pass SHG conversion efficiency of 38%. The green output power exhibits excellent passive stability of 0.24% rms over 15 h, has a TEM 00 spatial profile with M 2 < 1.93, and a beam pointing stability <9 μ rad over 1 h without active control.