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Holographic phase conjugation and Strehl ratio.

Deformable-mirror adaptive optic systems strive to correct the phase at every point of the aperture. Calculations exist which relate the system performance to the spatial-frequency response of the mirror. Adaptive systems such as holographic devices; which form the complete complex conjugate of the impressed wave front, require a different treatment. The Strehl ratio for such a system is calculated in terms of the device optical-transfer function. The systems are compared in the limit of photon shot noise.