The physical model of strong optical scintillation of plane waves is extended to the case of spherical-wave propagation. The spherical-wave amplitude filter function is derived and compared to the corresponding plane-wave result. Specifically, we calculate the spherical- to plane-wave log-amplitude-variance ratio. For weak fluctuations, our results are identical to the results of perturbation theory, with which the spherical-wave log-amplitude variance is less than the corresponding plane-wave result. On the other hand, for strong fluctuations (i.e., in the saturation regime), the plane- and spherical-wave log-amplitude variances saturate to the same constant value. Expressions are presented, in the saturation regime, for the plane- and spherical-wave log-amplitude covariance function and compared with the corresponding results in the regime of weak fluctuations.
© 1974 Optical Society of AmericaFull Article | PDF Article
L. C. Andrews, R. L. Phillips, C. Y. Hopen, and M. A. Al-Habash
J. Opt. Soc. Am. A 16(6) 1417-1429 (1999)
H. T. Yura
J. Opt. Soc. Am. 64(1) 59-67 (1974)
H. T. Yura
J. Opt. Soc. Am. 64(3) 357-359 (1974)