HIGH INTENSITY LASER PROPAGATION IN THE ATMOSPHERE
Semiannual rept. 1 Jul-30 Dec 1968
TRW SYSTEMS REDONDO BEACH CA QUANTUM PHYSICS LAB
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An approximate solution is found to the nonlinear, partial differential equation describing the thermal self-defocusing effect. The solution is for the special case of a flux distribution leaving the laser face, which has planar symmetry, is uniform over a semi-infinite region simulating the interior of the beam and falls off exponentially at the edge. The rays originating in the interior region are found to go up undeflected until they reach a height proportional to their original distance in from the edge and inversely proportional to the square root of the amount of heat per unit volume thus far deposited along the ray path. Then they begin to deflect outwards parabolically, more sharply for a larger heat density so far deposited, and also more sharply for a more steeply descending edge of the initial flux distribution.
- Atmospheric Physics
- Lasers and Masers