Abstract

We demonstrate pulse laser operation of a $\mathrm{Pr}:{\mathrm{LiYF}}_4$ laser pumped by InGaN laser diodes (444 nm) using an acousto-optic modulator. We obtained a maximum laser peak power of 167 W ($4\mathrm{\mu J}/\mathrm{pulse}$) with a pulse width of 24 ns at an 11 kHz repetition rate for a 63  nm wavelength. Employing an 8 mm long lithium triborate nonlinear crystal in the laser cavity, we obtained a maximum peak power of 55 W ($2.7\mathrm{\mu J}/\mathrm{pulse}$) at 320 nm, which corresponds to a conversion efficiency of 69% with respect to the fundamental laser energy. The UV laser pulse width was 36 ns.

©2012 Optical Society of America

InGaN diode pumped actively Q-switched intracavity frequency doubling Pr:LiYF₄ 261  nm laser

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