Parametric generation of infrared radiation between 10 µm and 25 µm in CdSe and proustite

Hanna, D., Cotter, D., Luther-Davies, B., Smith, R.C., Turner, A.J. and Wyatt, R. (1974) Parametric generation of infrared radiation between 10 µm and 25 µm in CdSe and proustite. IEEE Journal of Quantum Electronics, 10 (9), 793. (doi:10.1109/JQE.1974.1068243).

Abstract

Generation of tunable infrared radiation by difference mixing of signal and idler outputs from a parametric oscillator allows a considerable extension of tuning range into the infrared, The original proposal for this[1] included a demonstration of the principle in a proustite down-converter crystal together with the further suggestion that using a CdSe crystal would allow coverage from 10 μm to 25 μm. This has now been accomplished.
The doubly resonant proustite parametric oscillator was pumped by a 1.065 μm Q-switched Nd:YAG laser. 30-kW pump pulses of 20-ns duration produced total signal and idler powers of 3 kW over the signal wavelength range 1.91 μm - 2.04 μm. The corresponding range for the idler was 2.40 μm - 2.23 μm and for the difference wavelength 9.4 μm - 24.3 μm.
[1] G.C.Bhar, D.C.Hanna, B.Luther-Davies, and R.C.Smith, Opt. Commun., vol.6, pp.323-326, 1972.

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