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modulated grating hologram

A computer-generated, phase-and-amplitude, off-axis hologram made by a multi-exposure technique that uses three computer generated transmission masks. Each mask controls one fixed-phase component of the complex hologram transmittance. Large digital holograms (25x25mm) have been generated with this method. This method can be used with any holographic recording medium and was designed primarily for spatial filtering applications in which large dynamic and free spectral range is required.
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