Vol. 2, issue 06, article # 11

Pushnoi L. A. On the information content and limitations of Strehl criterion. // Atmospheric and oceanic optics. 1989. V. 2. No. 06. P. 516-522.
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The sensitivity of the Strehl criterion (SC) to the value, type and spatial frequency of optics errors was investigated. It is shown in the paper that the information content of SC is lost under the conditions when the variance of the wave front aberrations W exceeds the value 1/8l and SC < 0,6. This occurs due to the dissipation of energy from the diffraction limited core of the image. The ratio of spot sizes (of the actual one to the ideal) kd is suggested as an alternative criterion of the optics quality.