Abstract
We report the generation of average blue () power by frequency doubling of a diode-pumped Nd:YAG laser. We achieved pulsed operation at a high repetition rate () by driving the relaxation oscillations of the laser. A 40% conversion efficiency to the second harmonic was obtained in a single-pass, extracavity, first-order, quasi-phase-matched process in which periodically poled lithium niobate (period , thickness , and length ) at 140 °C was used. The resulting high-power blue beam was circular in profile and nearly diffraction limited, indicating that photorefractive effects do not appear to limit device performance.
© 1998 Optical Society of America
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