LIGHT MODULATION DETECTOR.
Interim engineering rept. no. 1, 15 Apr-15 Jul 64,
SYLVANIA ELECTRONIC SYSTEMS-WEST MOUNTAIN VIEW CALIF ELECTRONIC DEFENSE LABS
Pagination or Media Count:
This first report describes work performed in an experimental and theoretical program for the stabilization of a laser local oscillator for use in an optical heterodyne receiver for the detection and demodulation of microwave modulated light. The work in the quarter was divided into three main phases. These are 1 the development of a single-sideband suppressed carrier laser local oscillator with maximum power, 2 control of the modes of a laser by interferometric means to assure monochromatic output, and 3 design of an automatic frequency control system to tune the laser LO in frequency in accordance with the changes in the carrier frequency of an incoming signal from an independent laser transmitter. A unique and efficient single-sideband suppressedcarrier modulator has been developed. This modulator is situated inside the laser cavity and couples out only that laser energy which has been shifted in frequency.