Abstract
A high power singly resonant optical parametric oscillator based on periodically polled LiNbO3 (PPLN) is developed to produce >6 W cw signal power tunable in the λ= 1.7-2.1 μm range. This OPO was then used to observe net optical refrigeration in a thulium-doped solid for the first time. The OPO was synchronously pumped by a cw-modelocked (70 ps FWHM) Nd:YAG laser with Pave=18 W. The observed slope efficiency is more than 42%.
© 2000 Optical Society of America
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