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LIGHT MODULATION DETECTOR.
SYLVANIA ELECTRONIC SYSTEMS-WEST MOUNTAIN VIEW CALIF ELECTRONIC DEFENSE LABS
This third interim engineering report describes work performed by Sylvania Electronic Systems - West in the third quarter of an experimental and theoretical program to determine the feasibility of an automatic-frequencycontrolled AFC optical heterodyne receiver for the detection and demodulation of microwave-modulated light. The work of this quarter was divided into two main activities. The first was directed toward the demonstration of the supermode laser. Originated and first successfully employed in this laboratory, this is a technique for producing essentially single-frequency light using an output beam from a multimode laser, without suffering the loss of power inherent to conventional approaches which involve the suppression of modes. The second phase of the work in this quarter was concerned with the assembly and test of the AFC system used with the laser local oscillator to track the variations in frequency between the laser local oscillator and an independent laser transmitter sending microwave information. The AFC system has been assembled and tested with two lasers. Results show that all components of the system operate in accordance with the design, and frequency lock was achieved using the automatic acquisition circuits, without any necessity for manually tuning the lasers. Author
Interim engineering rept. no. 3, 15 Oct 64-15 Jan 65,
See also AD-604 022.
AF33 615 1938