Abstract

A new approach for efficient second-harmonic generation using diode lasers is presented. The experimental setup is based on a tapered amplifier operated in a ring resonator that is coupled to a miniaturized enhancement ring resonator containing a periodically poled lithium niobate crystal. Frequency locking of the diode laser emission to the resonance frequency of the enhancement cavity is realized purely optically, resulting in stable, single-frequency operation. Blue light at $488\mathrm{nm}$ with an output power of $310\mathrm{mW}$ is generated with an optical-to-optical conversion efficiency of 18%.

© 2010 Optical Society of America

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