Callaghan Innovation Research Papers

Back to Research Papers

TitleReal-time restoration of a blurred image with a liquid-crystal adaptive-optics system based on all-optical feedback interferometry
Publication TypeJournal Article
Year of Publication2001
AuthorsShirai, T., Barnes T.H., and Haskell T.G.
JournalOptics Communications
Pagination275 - 282
Date Published2001
ISSN00304018 (ISSN)
KeywordsAberrations, Adaptive optics, All-optical adaptive optics system, All-optical feedback interferometry, Image analysis, Image reconstruction, Interferometers, Light modulators, Light reflection, Liquid crystal displays
AbstractReal-time restoration of a blurred image using an all-optical adaptive-optics system with a liquid-crystal (LC) device is described. This system is based on a feedback interferometer, where the two-dimensional output fringe intensity from a Mach-Zehnder interferometer with large radial shear is optically fed back to an optically addressed phase-only LC spatial light modulator (SLM). In operation the phase of the reflection-type modulator approximates to half of the conjugate of the input aberrated wave front without a separate aberration-free reference wave. We applied this system to a problem of imaging through a phase-distorting medium and observed that an image blurred by the phase disturbance was restored immediately after the feedback loop was closed. In this case the response time and the resolution of the SLM were about 60 ms and 40 line pairs/mm, respectively.

Back to top