Abstract
A solution is obtained for Maxwell's field equations in the case of a cylindrical microwave cavity containing two concentric dielectrics, the outer being isotropic while the inner is a uniaxial crystal which has unequal transverse and longitudinal permittivities. The electric field along the crystal axis is then calculated in terms of the cavity parameters and microwave power, and related via the Pockels coefficient to the modulation produced in a light beam travelling along the crystal axis. Measurements of modulation depth for a given microwave input enable the Pockels coefficient at 9 Gc/s to be calculated, and the value so obtained in a crystal of potassium dihydrogen phosphate (KDP) is shown to agree reasonably well with previous measurements at low frequency and d.c.
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