J. Phys. IV France 01 (1991) C7-391-C7-394
HIGH EFFICIENCY MIDDLE IR PARAMETRIC SUPERRADIANCE IN ZnGeP2 AND GaSe CRYSTALS PUMPED BY AN ERBIUM LASERK.L. VODOPYANOV1, L.A. KULEVSKII2, A.I. GRIBENYUKOV3 and K.R. ALLAKHVERDIEV4
1 EP III, Uni-Bayreuth, Postfach 101251, D-8580 Bayreuth, Germany
2 General Physics Institute, Vavilov str. 38, Moscow 117942, USSR
3 Siberian Branch Acad. Sci. USSR, Tomsk, USSR
4 The Institute of Physics, Acad. Sci. Azerbaijan SSR, Baku, USSR
Parametric superradiant (resonator free) generation in nonlinear crystals of ZnGeP2 and GaSe (type I phase matching) was obtained for the first time. As a pump source 110 ps pulses from the actively mode locked Er:YAG laser (2.94 µm) were used. The tuning range achieved was 4-10 µm (ZnGeP2) and 3.5-18 µm (GaSe) . In case of ZnGeP2 (42 mm crystal) and type II phase matching the quantum efficiency reached 17.6% , corresponding to the output peak power of 3 MW near 5-6 µm.
© EDP Sciences 1991