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Reduction of speckles in retinal reflection

Appl. Phys. Lett. 91, 054104 (2007); doi:10.1063/1.2761835

Published 31 July 2007

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Vassilios Albanis, Erez N. Ribak, and Yuval Carmon
Department of Physics, Technion - Israel Institute of Technology, Haifa 32000, Israel
Speckle noise can deteriorate the quality of wave-front sensors measuring ocular aberrations. To counter that, a narrow laser beam was acoustically modulated before entering the eye and creating a spot on the retina. Light was scattered back through the aberrations into the sensor. The increased spot size, wider angular spread, and temporal modulation of the incoming beam averaged out the speckles, producing a more uniform response of the wave-front sensor. The method applies also to retinal imagers and to nonbiological speckle. ©2007 American Institute of Physics
History: Received 30 April 2007; accepted 28 June 2007; published 31 July 2007
Permalink: http://link.aip.org/link/?APPLAB/91/054104/1
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Supplemental Material

KEYWORDS and PACS

Keywords
PACS
  • 42.15.Fr
    Optical aberrations
  • 42.30.Ms
    Speckle and moire patterns
  • 42.79.-e
    Optical elements, devices, and systems
  • YEAR: 2007

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
Publisher:
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REFERENCES (16)
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