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26 October 1983 Synthetic Digital-Phase Gratings - Design, Features, Applications
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Digital-phase gratings are synthetic optical elements operating in-line as direct-vision components. They are called digital because only a few discrete values are allowed for the phase-structure within each grating period. Digital-phase gratings can be used for different applications. Three examples are described: star-couplers using binary-phase gratings for generating a central block of diffraction orders with equal intensity; color-splitters using gratings with more than two phase-levels; alterable gratings the blaze of which can be switched between the 3 central diffraction orders. Surface-relief digital-phase gratings are made by reactive ion etching in glass, and cheap plastic copies are obtained by a simple replication technique.
© (1983) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
H. Dammann "Synthetic Digital-Phase Gratings - Design, Features, Applications", Proc. SPIE 0437, Intl Conf on Computer-Generated Holography, (26 October 1983);


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