Blue/Green Coupled Wave Filter Demonstration
Abstract
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. f/10 (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 f/1 FOV (1 A for f/2 FOV). (5) Significant reduction in out-of-band transmission was shown, using a novel dual-element arrangement with intervening crossed polarizer.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1981
- Accession Number
- ADA099159
Entities
People
- D. M. Henderson
- J. F. Lotspeich
Organizations
- HRL Laboratories