Abstract
The wavefront aberration of laser beam produced in the process of laser propagation in the atmosphere can be compensated with the stimulated Brillouin-scattering (SBS) effect. However, in case of an uncooperative extensive target, the beacon is remained as a problem. Based on the method of active beacon, and making use of threshold effect of SBS, we present a method to obtain a beacon of small area on an uncooperative target, and with it, the laser beam can be focused on the small area.
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