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Efficient, high-power, ytterbium-fiber-laser-pumped picosecond optical parametric oscillator

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Abstract

We report a high-power picosecond optical parametric oscillator (OPO) synchronously pumped by a Yb fiber laser at 1.064μm, providing 11.7W of total average power in the near to mid-IR at 73% extraction efficiency. The OPO, based on a 50mm MgO:PPLN crystal, is pumped by 20.8ps pulses at 81.1MHz and can simultaneously deliver 7.1W of signal at 1.56μm and 4.6W of idler at 3.33μm for 16W of pump power. The oscillator has a threshold of 740mW, with maximum signal power of 7.4W at 1.47μm and idler power of 4.9W at 3.08μm at slope efficiencies of 51% and 31%, respectively. Wavelength coverage across 1.431.63μm (signal) and 4.163.06μm (idler) is obtained, with a total power of ~11 W and an extraction efficiency of ~68%, with pump depletion of ~78% maintained over most of the tuning range. The signal and idler output have a single-mode spatial profile and a peak-to-peak power stability of ±1.8% and ±2.9% over 1h at the highest power, respectively. A signal pulse duration of 17.3ps with a clean single-peak spectrum results in a time-bandwidth product of ~1.72, more than four times below the input pump pulses.

© 2010 Optical Society of America

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