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High-power, continuous-wave, mid-infrared optical parametric oscillator based on MgO:sPPLT

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Abstract

We report a stable, high-power, cw, mid-IR optical parametric oscillator using MgO-doped stoichiometric periodically poled LiTaO3 (MgO:sPPLT) pumped by a Yb fiber laser at 1064nm. The singly resonant oscillator (SRO), based on a 30mm long crystal, is tunable over 430nm from 3032 to 3462nm and can generate as much as 5.5W of mid-IR output power, with >4W of over 60% of the tuning range and under reduced thermal effects, enabling room temperature operation. Idler power scaling measurements at 3.3μm are compared with an MgO-doped periodically poled LiNbO3 cw SRO, confirming that MgO:sPPLT is an attractive material for multiwatt mid-IR generation. The idler output at 3299nm exhibits a peak-to-peak power stability better than 12.8% over 5h and frequency stability of 1GHz, while operating close to room temperature, and has a linewidth of 0.2nm, limited by the resolution of the wavemeter. The corresponding signal linewidth at 1570nm is 21MHz.

© 2011 Optical Society of America

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