Abstract

We demonstrate single-frequency operation of a cw quasi-phase-matched singly resonant optical parametric oscillator (SRO). We obtained widely tunable output from 1.66 to 1.99  µm (signal) and from 2.29 to 2.96  µm (idler) by employing a periodically poled lithium niobate multigrating chip. Using a single-frequency miniature Nd:YAG ring laser as a pump source results in SRO output with high spectral purity and frequency stability (<10 MHz/min), which can be continuously tuned over 2  GHz without mode hops. We obtain a minimum SRO threshold of 260  mW by resonating the pump wave in the SRO cavity.

© 1997 Optical Society of America

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