Abstract

We report a high-power, cw, single-frequency optical parametric oscillator pumped external to an optically pumped semiconductor laser (OPSL). The singly resonant oscillator (SRO), based on a 30mm crystal of MgO:sPPLT, is pumped by a 6W, cw OPSL at 532nm. By deploying signal outcoupling and loose focusing in the presence of low pump power, we achieve significant improvements in SRO performance across the tuning range with regard to signal power, extraction efficiency, and pump depletion by reducing thermal effects. We generate >1.78W of idler and >0.9W of signal over 8561404nm while maintaining a total output power of >2W over 93% of the tuning range at an extraction efficiency of 48.7% and pump depletion of 84%. The signal power remains within 0.851.05W across the entire tuning range and has a TEM00 spatial profile with M2<1.28 and circularity of >97%. Measurements of signal spectrum confirm single-frequency performance with an instantaneous linewidth of 15MHz and frequency stability better than 60MHz over 60s.

© 2010 Optical Society of America

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