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 AmericaFull Article | PDF Article
OSA Recommended Articles
J. S. Ryan, S. R. Pal, and A. I. Carswell
J. Opt. Soc. Am. 69(1) 60-67 (1979)
Appl. Opt. 21(9) 1593-1598 (1982)
Adarsh Deepak, Usamah O. Farrukh, and Andrew Zardecki
Appl. Opt. 21(3) 439-447 (1982)