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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 61, Iss. 7 — Jul. 1, 1971
  • pp: 847–851

Speckle Removal by a Slowly Moving Diffuser Associated with a Motionless Diffuser

SERGE LOWENTHAL and DENIS JOYEUX  »View Author Affiliations

JOSA, Vol. 61, Issue 7, pp. 847-851 (1971)

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A moving diffuser destroys the spatial coherence of laser light only partially when the integration time is finite; this can be expressed by the signal-to-noise (S/N) ratio in the observed illuminance, due to the residual speckle. The method can be improved by the use of a two-diffuser system of which one diffuser is motionless, the other moving. In this case, the integration time (or the displacement of the diffuser) required to obtain a given S/N ratio can be greatly reduced, allowing the use of a slowly moving diffuser. Moreover, the S/N ratio does not depend on the optical-system parameters, whereas it depends on these parameters when a single diffuser is used.

© 1971 Optical Society of America

SERGE LOWENTHAL and DENIS JOYEUX, "Speckle Removal by a Slowly Moving Diffuser Associated with a Motionless Diffuser," J. Opt. Soc. Am. 61, 847-851 (1971)

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