17 March 2000 Optical correlation using bitonal magnitude-only spatial light modulators
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An optical correlator based on VanderLugt filtering has been constructed using a bitonal spatial light modulator for the transfer function of the matched filter. Because the spatial light modulator can reproduce bitonal magnitude signals only, the filter is introduced as a Lohmann cellular hologram. The traditional additive random phase may not be used, and thus filter functions constructed from uncompensated cellular holograms are inherently lowpass in nature. In the system reported here, improved performance results from an approximation of the ideal reference spectrum and by using error-diffused quantization.
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John P. Knapp, John P. Knapp, Roger L. Easton, Roger L. Easton, } "Optical correlation using bitonal magnitude-only spatial light modulators", Proc. SPIE 3956, Practical Holography XIV and Holographic Materials VI, (17 March 2000); doi: 10.1117/12.380001; https://doi.org/10.1117/12.380001

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