Accession Number : AD0742983

Title :   The Mutual Coherence Function of a Finite Cross Section Optical Beam Propagating in a Turbulent Medium.

Descriptive Note : Rept. for Jul-Aug 71,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Yura,H. T.

Report Date : 12 MAY 1972

Pagination or Media Count : 39

Abstract : On the basis of the extended Huygens-Fresnel principle, a general expression is derived for the mutual coherence function (MCF) of a finite optical beam propagating in a weakly inhomogeneous medium. The results obtained for the beam MCF are valid both in the near and far field of the laser transmitting aperture and for an arbitrary complex disturbance in the exit pupil of the aperture. A general expression is also derived for the propagation distance z(B) such that for distances much less (greater) than z(B), the MCF is well approximated by the plane (spherical) wave results. An analytic expression is presented for a gaussian beam such that a numerical error in previous results is corrected. Finally, some comments regarding higher-order statistical moments of the field are given. (Author)

Descriptors :   (*COHERENT RADIATION, PROPAGATION), (*LIGHT TRANSMISSION, TURBULENCE), WAVE FUNCTIONS, INTEGRALS, DISTRIBUTION FUNCTIONS, REFRACTIVE INDEX, INFRARED RADIATION

Subject Categories : Lasers and Masers
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE