THEORETICAL AND EXPERIMENTAL INVESTIGATION OF OPTICAL HETERODYNING.
Interim engineering rept. no. 1,
CONTROL DATA CORP MELVILLE N Y TRG DIV
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This report is the first interim report on Theoretical and Experimental Investigation of Optical Heterodyning. The objectives of this study are to improve the A.F.C. tracking system, to study and determine the most suitable means of self-stabilizing lasers, and to construct such a laser in accordance with the findings of this study. The A.F.C. lock between two red lasers has been improved, achieving a tracking stability of 1 part in 10 to the 12th power. Using these two locked lasers in an optical heterodyne system, signal-to-noise measurements were made and found to be within 10db of the theoretical value. Piezo electric transducers which have flat frequency response to 200 kc have been developed, enabling considerable extension of servo gain and bandwidth. Two schemes for selfstabilizing lasers are discussed in detail and experimental models of both are under construction. Author