Based upon modulation transfer function, the Strehl ratio and compensation efficiency of an adaptive optical technique in the region of strong turbulence are discussed.The amplitude-fluctuation correlation is taken into account. Theoretical expreessions of Strehl ratio and compensation efficiency are derived. Calculations show that the theoretical predictions coincide with the experimental values very well. In the case of noncompelet compensation, the adaptive optical technique is useful even in the region of strong turbulence.
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