Abstract

A compact source of stable cw single-frequency radiation at 473 nm has been realized by second-harmonic generation of a diode-pumped miniature Nd:YAG ring laser operating on the ${{}^{4}F}_{3/2}$–${{}^{4}I}_{9/2}$ laser transition. By use of potassium niobate (KNbO₃), single-longitudinal-mode output powers of 500 mW cw with high stability and maximum optical-to-optical conversion efficiencies $>81$% are achieved. An external semimonolithic cavity permits mode-hop-free frequency tuning of blue radiation over as much as 20 GHz.

© 1997 Optical Society of America

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