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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 68, Iss. 7 — Jul. 1, 1978
  • pp: 900–908

Laser beam broadening and depolarization in dense fogs

J. S. Ryan and A. I. Carswell  »View Author Affiliations

JOSA, Vol. 68, Issue 7, pp. 900-908 (1978)

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The spatial profiles and polarization properties of a Gaussian laser beam transmitted through dense water-droplet fogs have been studied in the laboratory. A narrow, linearly polarized beam at 514 nm experiences various degrees of broadening on propagating through a 1 m thick layer of fog. The extent of the observed broadening has been found to exhibit a strong dependence on both the attenuation coefficient of the fog and on receiver paramaters. Even at optical thicknesses in excess of 5 the beam retains a Gaussian core which does not broaden appreciably. Measurements of the polarization state of forward-scattered light reveal that in dense fogs the linear polarization is strongly preserved. The linear depolization ratio δ increases with distance off the laser beam axis, although it never exceeds 0.01 in our experiment. The applicability of a single-scatteing model is describing the results is discussed.

© 1978 Optical Society of America

J. S. Ryan and A. I. Carswell, "Laser beam broadening and depolarization in dense fogs," J. Opt. Soc. Am. 68, 900-908 (1978)

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