The prior work of Dixon, Harris, and Isomet Corp. on the electronically-tunable, collinear-interaction, optical filter was extended with the view toward operation in the infrared spectral range from 0.75 micrometers to 4.0 micrometers. Two filters covering the sub-bands from 0.75 to 1.5 micrometers (Band I) and 1.5 to 2.8 micrometers (Band II) were designed and breadboard models were constructed. Good agreement was obtained between the measured and theoretical of these ...
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