A CdSe optical parametric oscillator (OPO) pumped by a 2.79-μm , Cr, Er:YSGG laser yielded a 59% signal-plus-idler slope efficiency (η), a total idler output of 1.2–2.4mJ between 8.5 and 12.3 μm , and an idler beam that was 2.2–2.5 times the diffraction limit. A ZnGeP2 OPO operated with a lower threshold, η = 29% , and a forward idler output of 0.7–2.4 mJ from 6.9 to 9.9 µm . The signal and idler bandwidths were typically 4 cm-1 for each OPO.
© 1997 Optical Society of America
Toomas H. Allik, Suresh Chandra, David M. Rines, Peter G. Schunemann, J. Andrew Hutchinson, and Richard Utano, "Tunable 7 12-µm optical parametric oscillator using a Cr,Er:YSGG laser to pump CdSe and ZnGeP2 crystals," Opt. Lett. 22, 597-599 (1997)