High-average-power diode-end-pumped intracavity-doubled Nd:YAG laser

摘要

A compact diode-pumped ND:YAG laser was frequency-doubled to 0.532 (mu)m with an intracavity KTP or LBO crystal using a 'V' cavity configuration. Two acousto-optic Q-switches were employed at repetition rates of 10-30 kHz. Dichroic fold and end mirrors were used to output two beams with up to 140 W of 0.532 (mu)m power using KTP and 116 W using LBO as the frequency doubling crystal. This corresponds to 66% of the maximum output power at 1.064 (mu)m obtained with an optimized output coupler reflectivity. The minimum output pulse duration varied with repetition rate from 90 to 130 ns. The multimode output beam had a smooth profile and a beam quality of M(sup 2) = 5 1.