Off-axis optical transfer function calculations in an adaptive-optics system by means of a diffraction calculation for weak index fluctuations.

Details Off-axis optical transfer function calculations in an adaptive-optics system by means of a diffraction calculation for weak index fluctuations. Off-axis optical transfer function calculations in an adaptive-optics system by means of a diffraction calculation for weak index fluctuations.

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994josaa..11.2100t&link_type=abstract

Journal of the Optical Society of America A, Vol. 11, No. 7, p. 2100 - 2111

Physics

Optics

10

Adaptive Optics: Earth Atmosphere

Scientific paper

The effects of turbulence-induced anisoplanatism cause the performance of an adaptive-optics system to be dependent on the separation angle between the imaged object and the source used as a reference. One method of quantifying this performance is through the optical transfer function (OTF). A new method is presented for calculating the upper bound on the OTF that is due to the residual or uncorrected phase and amplitude variations in an adaptive-optics system. The method includes diffraction effects, which in turn result in phase and amplitude effects. These results are compared with the geometric optics and are shown to yield a larger isoplanatic angle. A general expression for the OTF is obtained that permits evaluation of the effect of the inner- and outer-scale size of turbulence. A method is presented for layering the atmosphere and scaling the transfer function to different values of r0 and Cn2 profiles without the need to recompute the entire OTF. The authors show that with four layers placed at 200 m, 2 km, 10 km, and 18 km the calculated OTF's are within 1% of the OTF's obtained with a continuous atmosphere.

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