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Design of a Microwave-Frequency Light Modulator

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1 Author(s)
Blumenthal, R.H. ; Sperry Electro Devices Laboratory, Sperry Gyroscope Co., Division of Sperry Rand Corp., New Hyde Park, N.Y.

A device is described which intensity modulates a light beam at modulating frequencies in the microwave region. A high-Q re-entrant capacity-loaded coaxial-line resonator employing a properly oriented slab of uniaxial crystal of the dihydrogen phosphate variety as its dielectric medium is coupled to a microwave-frequency generator tuned to the fundamental cavity mode. A light path is provided through the resonator so that a beam of plane polarized light can pass through the crystal into a suitably oriented analyzer. The intensity of the light beam emerging from the latter varies at the same rate as the cavity frequency.

Published in:

Proceedings of the IRE  (Volume:50 ,  Issue: 4 )