Diode-pumped short pulse passively Q-switched 912 nm Nd:GdVO _4/Cr:YAG laser at high repetition rate operation

摘要

A diode-end-pumped passively Q-switched 912 nm Nd:GdVO_4/Cr:YAG laser is demonstrated for the first time. In a concave-piano cavity, pulsed 912 nm laser performance is investigated using two kinds of Cr:YAG crystal with different unsaturated transmission (T_U) of 95% and 90% at 912 nm as the saturable absorbers. When the T_U = 90% Cr:YAG is used, as much as 2.6 W average output power for short pulsed 912 nm laser is achieved at an absorbed pump power of 34.0 W, corresponding to an optical efficiency of 7.6% and a slope efficiency of 20.3%. Moreover, 10.5 ns duration pulses and up to 2.3 kW peak power is obtained at the repetition rate around 81.6 kHz.