Spatially resolvable phase conjugate thresholding system.

David M. Pepper, S. T. Wu, U. Efron

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


A technique is reported that circumvents the complications and limitations inherent with existing approaches, while satisfactorily addressing the requirements for conjugation, thresholding, phasing, and spatial bandwidth. The technique involves placing a liquid crystal light valve (LCLV) in series with a phase conjugate mirror (PCM). In principle, most classes of spatial light modulator can be used, as can any class of PCM (self-pumped, externally pumped, etc.). In both cases, the LCLV is configured as a threshold reflector, while the PCM is used to phase-up and retroreturn the threshold information. Since all the information is incident onto a common PCM, even a self-pumped device can be used; in general, all the conjugated components will maintain the same relative phase relationships to each other before and after conjugation. The thresholding nature of the LCLV is obtained by an optical feedback loop. The PCM compensates for phase distortions present in the optical train, including the LCLV itself, by a double-pass geometry. Hence the spatial fidelity of this processor is expected to be high.

Original languageEnglish
Title of host publicationCLEO 88 Conf Lasers Electro Opt 1988 Tech Dig Ser Vol 7
PublisherInstitute of Electrical and Electronics Engineers
Pages382, 383, 384
ISBN (Print)155752033X
StatePublished - 1 Dec 1988
Externally publishedYes

Publication series

NameCLEO 88 Conf Lasers Electro Opt 1988 Tech Dig Ser Vol 7

ASJC Scopus subject areas

  • General Engineering


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