Abstract

A tandem optical parametric oscillator (OPO) is used to convert radiation from 1.064μm to the mid-infrared. Spectral bandwidth narrowing close to 80 times compared with a conventional cavity was achieved by using a bulk Bragg grating as an outcoupler in a near-degenerate periodically poled KTiOPO4 OPO. The narrowed 2008nm radiation was subsequently used for pumping the ZnGeP2 OPO, which was tunable between 3.3 and 5.2μm. Pulse energies of 170μJ and pump depletion close to 70% were obtained in the ZnGeP2 OPO. To our knowledge this is the first time the output from a near-degenerate type I PPKTP OPO has been used for ZnGeP2 OPO pumping.

© 2006 Optical Society of America

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