Accession Number : AD0748994

Title :   Thermal Blooming in Viscous and Thermally Conducting Fluids.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Hayes,J. N.

Report Date : 21 AUG 1972

Pagination or Media Count : 23

Abstract : The problem of thermal blooming of a laser beam in viscous and thermally conducting fluids is treated by means of the model discussed NRL Report 7213. (In that report blooming was treated for an ideal gas only). It is shown that viscous effects are small, as should be expected. The longtime behavior of the density in the presence of thermal conductivity is discussed at length. The cases of beam diameters of 0.5 and 1.0 cm with Gaussian intensity profiles are treated. The effect of thermal conduction in these cases is small, but in the direction of reducing the thermal blooming. For smaller diameter beams, it is shown that conductive effects are more pronounced. (Author)

Descriptors :   (*LASERS, LIGHT TRANSMISSION), MATHEMATICAL MODELS, HYDRODYNAMICS, PARTIAL DIFFERENTIAL EQUATIONS

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE