Abstract

We report the observation of thermal-induced optical guiding and bistability in a mid-IR cw, singly resonant optical parametric oscillator (SRO) at 3.2μm. The SRO employs a MgO:PPLN crystal as the gain medium and a 1-nm-linewidth Yb-fiber laser at 1.064μm as the pump source. As soon as the pump power reaches the thermal guiding threshold at 16.5W, the SRO shows a step increase in the parametric efficiency by a factor of 2.5. At 25 W pump power, the SRO generated 5.3 and 1.2W at 1.58 and 3.23μm, respectively, with single-longitudinal-mode performance for the 3.23μm radiation.

© 2008 Optical Society of America

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