STEADY STATE THERMAL BLOOMING OF MULTIPULSE LASER BEAMS

Authors
  1. Bissonnette, L.R.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
Steady state thermal blooming of multipulse laser beams subjected to cross winds is studied in the light of numerical solutions. Enhancement resulting in a 100% increase of the peak irradiance with respect to the non-bloomed but linearly absorbed beam is demonstrated at the optimal pulsing rate. The corresponding gain in terms of spatially averaged power density over the target area containing 85% of total power is 40%. A parametric study is made as a function of three similarity parameters which are sufficient to completely define the per flow time, the Fresnel number F based on the absorption-irradiance interaction length scale and the absorption number gamma related to linear depletion. Optimal conditions for a collimated Gaussian beam are shown to exist.
Report Number
DREV-4067/77 —
Date of publication
15 Feb 1977
Number of Pages
35
DSTKIM No
77-01608
CANDIS No
124278
Format(s):
Hardcopy;Originator's fiche received by DSIS

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