Simultaneous operations at 1125  nm, 1161  nm, and 1567  nm from a single KTiOPO₄ crystal pumped by a passively Q-switched Nd:GGG laser

Abstract

A multiwavelength operation generated from an intracavity optical parametric oscillator (OPO) pumped by a passively $Q$-switched Nd:GGG laser with a ${\mathrm{Cr}}^{4+}\text{:}\mathrm{YAG}$ saturable absorber is demonstrated. ${\mathrm{KTiOPO}}_4$ simultaneously worked as nonlinear OPO and Raman crystal. Maximum output powers of 302 mW at 1566.8 nm and 115 mW at $1124.9/1160.7\mathrm{nm}$ were obtained at a diode power of 10.5 W, corresponding to the optical-to-optical conversion efficiencies of 2.88% and 1.1%, respectively. The measured shortest pulse duration at 1566.8 nm was 1.61 ns, while the obtained minimum pulse duration at $1124.9/1160.7\mathrm{nm}$ was 2.88 ns.

© 2014 Optical Society of America