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High-power, Yb-fiber-laser-pumped, picosecond parametric source tunable across 752–860 nm

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Abstract

We report a stable, high-power source of picosecond pulses in the near-infrared based on intracavity second harmonic generation (SHG) of a MgO:PPLN optical parametric oscillator synchronously pumped at 81 MHz by a mode-locked Yb-fiber laser. By exploiting the large spectral acceptance bandwidth for Type I (ooe) SHG in β-BaB2O4 and a 5 mm crystal, we have generated picosecond pulses over 752–860 nm spectral range under minimal angle tuning, with as much as 3.5 W of output power at 778 nm and >2W over 73% of the tuning range, in good beam quality with TEM00 spatial profile and M2<1.4. The SHG output pulses have durations of 15.2 ps, with a spectral bandwidth of 3.4nm at 784 nm. In addition, the oscillator simultaneously provides a signal power of >1W over 1505–1721 nm (25 THz) and idler power >1.8W over 2787–3630 nm (25 THz), corresponding to a total (signal plus idler) tuning range of 1059 nm. The SHG, signal, and idler output exhibit passive long-term power stability better than 1.6%, 1.3%, and 1.6% rms, respectively, over 14 h.

©2012 Optical Society of America

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