AO (adaptive optics) systems have been extensively used to improve the beam quality in high-energy lasers; however, few studies\nhave focused on how much the beam quality could be improved. A novel evaluation criteria and factor is presented in this paper.\nThe factor, defined as power in ring (PIR), is expressed by distinguishing the low- and high-spatial frequency components in the\nfar-field laser intensity distribution. Beams with different PIR values are generated in our model, and then they are compensated\nby AO systems. Calculation result shows that the PIR factor could evaluate a laser beamâ??s improvement potential by an AO\nsystem quantitatively.
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