Abstract
We describe a singly resonant optical parametric oscillator (OPO) using a noncritically phase-matched KTP crystal, intracavity- pumped by a Q-switched Nd:YAG laser. Signal pulse energy of as much as 8.1 mJ in the eye-safe range at 1.58-mm wavelength was coupled out of the cavity. We have elaborated a simple model of an intracavity laser- pumped OPO (IOPO), based on the rate equations for the Q-switched laser combined with the coupled equations for the parametric interaction in the nonlinear crystal. At 1.5 times pulsed IOPO threshold, signal pulse widths of 5 and 6 ns were calculated and detected, respectively. © 2001
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