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Opt Lett. 1988 Mar 1;13(3):251-3.

Phase-only modulation with twisted nematic liquid-crystal spatial light modulators.

Abstract

It is shown that twisted nematic liquid-crystal spatial light modulators behave as phase-only modulators when operated below the conventional optical threshold. Thus such devices, when operated in a reflection mode, behave as spatial amplitude modulators when used between crossed polarizers above the optical threshold; they behave as phase modulators when used between parallel polarizers and operated below that threshold.

PMID:
19742044
[PubMed]
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