Abstract
A high power orthogonally polarized mid-infrared (mid-IR) laser was realized by a singly resonant optical parametric oscillator (SROPO) employing two KTA crystals with the Z-axes perpendicular to each other. The SROPO was pumped by a diode-end-pumped acoustic-optically (AO) Q-switched Nd:YAG laser, and each of the KTA crystals used a differently polarized part of the fundamental wave and participated in separated frequency conversion. The maximum SROPO output power of 2.18 W including 0.98 W of signal at 1535 nm and 1.2 W of idler at 3468 nm was obtained at a repetition rate of 6 kHz and an absorbed pump power of 16.5 W, corresponding to an optical-to-optical conversion efficiency of up to 13.2 % and a slope efficiency of 19.4 %. The 3468-nm beam M2-factor of 1.6 was measured by a beam analyzer.
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