Traveling-wave parametric generators with angular tuning with the use of ZnGeP2 and GaSe crystals pumped by 100-ps pulses from an actively mode-locked Er laser (λ ≈ 3 μm) are reported. The continuous-tuning range achieved was 4–10 μm (ZnGeP2; length, 12 mm) and 3.5–18 μm (GaSe; length, 12 mm) in a type-I interaction, with a quantum conversion efficiency of a few percent. In the case of ZnGeP2 (length, 42 mm) and type-II phase matching, the pump threshold was 0.35 GW/cm2 and the quantum efficiency achieved was 17.6%, corresponding to an output peak power of 3 MW near 5–6 μm.
© 1993 Optical Society of America
Original Manuscript: December 29, 1992
Revised Manuscript: April 6, 1993
Published: September 1, 1993
K. L. Vodopyanov, "Parametric generation of tunable infrared radiation in ZnGeP2 and GaSe pumped at 3 μm," J. Opt. Soc. Am. B 10, 1723-1729 (1993)