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 crystal of MgO:sPPLT, is pumped by a , cw OPSL at . 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 of idler and of signal over while maintaining a total output power of over 93% of the tuning range at an extraction efficiency of 48.7% and pump depletion of 84%. The signal power remains within across the entire tuning range and has a spatial profile with and circularity of . Measurements of signal spectrum confirm single-frequency performance with an instantaneous linewidth of and frequency stability better than over .
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