Blue/Green Coupled Wave Filter Demonstration
Final rept. 4 Jun 1980-28 Feb 1981
HUGHES RESEARCH LABS MALIBU CA
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The performance of AgGaS2 iso-index coupled-wave electro-optic filters in wide-field of view FOV operation has been characterized in detail, both theoretically and experimentally. The principal conclusions of this program are 1 The effect of optical activity on the filter passband is negligible for input light cones smaller than approx. f10 3 deg half-angle. 2 For larger FOVs, the main lobe of the filter transfer characteristic broadens considerably, and increased out-of-band transmission occurs. 3 At very large FOVs aprox. f 0.5, the peak transmittance approaches 50, virtually independent of applied electric field. 4 the effects of optical activity override attempts to narrow the passband by increasing filter length, resulting in an optimum crystal length of about 3 mm and a minimum passband of about 2 A for f1 FOV 1 A for f2 FOV. 5 Significant reduction in out-of-band transmission was shown, using a novel dual-element arrangement with intervening crossed polarizer.
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