Bragg Angle Colliner Heterodyning Filter.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent describes a Bragg angle matched filter wherein the light rays reflected by the delay cell are combined with the modulated rays which rebound from the wave plate and travel back through the delay cell. The combined rays are converged by a lens onto an aperture. A photodetector beyond the aperture yields an output proportional to the intensity of the converged wave. Planar waves entering the lens give a maximum output from the photodetector and, therefore, indicate a correlation peak.