Parametric generation of tunable infrared radiation in ZnGeP_2 and GaSe pumped at 3 μm
- 1 September 1993
- journal article
- Published by Optica Publishing Group in Journal of the Optical Society of America B
- Vol. 10 (9), 1723-1729
- https://doi.org/10.1364/josab.10.001723
Abstract
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.Keywords
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