Long Wavelength Modulation Techniques (10.6 Microns).
Interim technical rept. 22 Feb-22 Nov 71,
HUGHES RESEARCH LABS MALIBU CA
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This program is an exploratory study, involving both a theoretical and experimental analysis, whose principal goal is to identify an optimum modulation technique for intensity modulation of a 10.6 micrometers CO2 laser. In addition to requirements of minimum driver power burden, the technique so identified must have a minimum frequency response of 200 MHz and show clear capability of extension to 1 GHz. During this report period a comprehensive review of all known techniques applicable to CO2 laser modulation was undertaken. Included in this study were the electro-optic effect, Stark effect, acousto-optic effect, and a number of processes broadly classified under free-carrier effects. In addition, a substantial effort was initially devoted to exploring novel, specialized, innovative techniques not otherwise available in the literature. The study involved a two-stage elimination process. The frequency response capabilities of all techniques were assessed, and those possessing inherent limitations well below 200 MHz were identified and eliminated from further consideration.
- Lasers and Masers
- Non-Radio Communications