Abstract

We report a compact and viable source of broadband, high-power, cw, mid-IR radiation based on a singly resonant optical parametric oscillator (SRO) pumped by a wide-bandwidth cw Yb fiber laser centered at 1060nm. By exploiting the extended phase-matching bandwidth in a 50mm crystal of MgO:PPLN and a ring SRO cavity, we obtain 5.3W of broadband idler output for 25.5W of pump at >80% depletion, transferring a pump bandwidth of 73.9cm1 to an idler spectrum spread across an equal bandwidth centered at 3454nm. By deploying output coupling of the signal, we generate 11.2W of total power at 44% extraction efficiency with a pump depletion of >73% at the maximum available pump power. Measurements of transverse modal power confirm Gaussian distribution of signal and idler beams.

© 2009 Optical Society of America

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