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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 19, Iss. 2 — Feb. 1, 2002
  • pp: 369–377

Adaptive restoration of a partially coherent blurred image using an all-optical feedback interferometer with a liquid-crystal device

Tomohiro Shirai and Thomas H. Barnes  »View Author Affiliations


JOSA A, Vol. 19, Issue 2, pp. 369-377 (2002)
http://dx.doi.org/10.1364/JOSAA.19.000369


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Abstract

A liquid-crystal adaptive optics system using all-optical feedback interferometry is applied to partially coherent imaging through a phase disturbance. A theoretical analysis based on the propagation of the cross-spectral density shows that the blurred image due to the phase disturbance can be restored, in principle, irrespective of the state of coherence of the light illuminating the object. Experimental verification of the theory has been performed for two cases when the object to be imaged is illuminated by spatially coherent light originating from a He–Ne laser and by spatially incoherent white light from a halogen lamp. We observed in both cases that images blurred by the phase disturbance were successfully restored, in agreement with the theory, immediately after the adaptive optics system was activated. The origin of the deviation of the experimental results from the theory, together with the effect of the feedback misalignment inherent in our optical arrangement, is also discussed.

© 2002 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(030.1640) Coherence and statistical optics : Coherence
(110.0110) Imaging systems : Imaging systems
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(230.3720) Optical devices : Liquid-crystal devices

Citation
Tomohiro Shirai and Thomas H. Barnes, "Adaptive restoration of a partially coherent blurred image using an all-optical feedback interferometer with a liquid-crystal device," J. Opt. Soc. Am. A 19, 369-377 (2002)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-19-2-369


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References

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  20. For phase modulation characteristics of the PAL-SLM used in our experiment, see Fig. 2 of Ref. 7.
  21. The focal length of each lens: 30 cm for L1, 20 cm for L2, 30 cm for L3, and 30 cm for L4.
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  23. This hypothesis can, in principle, be justified experimentally by putting a color filter in front of the halogen lamp. However, the limited power of our halogen lamp (100 W) and/or the limited sensitivity of our CCD camera prevented us from obtaining meaningful data.
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