Highly ordered single-crystal films of cubic zinc sulphide are grown epitaxially on silicon substrates by sublimation in u.h.v. The electro-optic coefficients are measured using a sensitive a.c. method and values of r41 up to 6.73×10-13 mV-1 are reported.

Electro-optic thin films of zinc sulphide

A Travelling Wave Light Modulator with 15 GHz Bandwidth

A travelling-wave light-intensity modulator is described which uses two natural crystals of ZnS. This prototype needs a peak microwave pulse of 2 kW for 45% modulation, and has an overall bandwidth of 15% at 9.75 GHz.

D.C. Doughty

Papers

X band travelling-wave light-intensity modulator using ZnS crystals