The use of multiple transmitter beams is shown to significantly increase the peak focal-plane irradiance that can be achieved in the presence of thermal blooming. Computer simulation studies of the beam propagation problem show over a factor of 2 increase in the irradiance of a single beam and a factor of 9 increase when three coherent beams are focused on the same target spot. Preliminary experimental results with three mutually noncoherent, nonoverlapping beams are in qualitative agreement with the computer simulation.
C. Yeh, J. E. Pearson, and W. P. Brown, Jr., "Enhanced focal-plane irradiance in the presence of thermal blooming," Appl. Opt. 15, 2913-2916 (1976)