Thermal Blooming in Viscous and Thermally Conducting Fluids.
NAVAL RESEARCH LAB WASHINGTON D C
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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
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