High efficiency middle IR parametric superradiance in ZnGeP2 and GaSe crystals pumped by an erbium laser

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Abstract

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.

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1

Present address: EP III, Uni-Bayreuth, Postfach 101251, W-8580 Bayreuth, Germany (also for communications).

2

Siberian Branch Acad. Sci. USSR, Tomsk, USSR.

3

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