Phase-Only Optical Filter for Use in an Optical Correlation System.
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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A phase-only optical filter capable of being utilized within a phase-only optical correlation system. The phase-only optical correlation system. The phase-only optical filter is made by mathematically generating preselected phase-only information by a fast Fourier Transform technique. This generated phase-only information is transferred onto an unexposed holographic film. Therefore, the film is developed and subsequently bleached. The resultant bleached film is the phase-only filter which, when utilized in a correlation system, provides substantially 100 utilization of the source of electromagnetic radiation during the corelation process.