thermal blooming

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thermal blooming

[′thər·məl ′blüm·iŋ]
(optics)
The phenomenon of self-defocusing in certain weakly absorbing media; it is prominent, for example, in the propagation of high-power infrared laser beams through the atmosphere.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.