National Optical Astronomy Observatories (NOAO) infrared adaptive optics program. II - Modeling atmospheric effects in adaptive optics systems for astronomical telescopes

Details National Optical Astronomy Observatories (NOAO) infrared adaptive optics program. II - Modeling atmospheric effects in adaptive optics systems for astronomical telescopes National Optical Astronomy Observatories (NOAO) infrared adaptive optics program. II - Modeling atmospheric effects in adaptive optics systems for astronomical telescopes

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..628..298r&link_type=abstract

IN: Advanced technology optical telescopes III; Proceedings of the Meeting, Tucson, AZ, Mar. 3-6, 1986 (A87-35201 15-89). Bellin

Physics

Optics

6

Adaptive Optics, Atmospheric Effects, Atmospheric Refraction, Infrared Telescopes, Airy Function, Atmospheric Turbulence, Bessel Functions, Diffraction, Transfer Functions

Scientific paper

However perfect an adaptive optical system can be, it will never fully correct the image. The effects of amplitude errors due to stellar scintillation, the effects of chromatic errors due to both refraction and diffraction in a two-wavelength system, and the effects of nonisoplanicity, are presently discussed. All these errors are directly related to the height of turbulence layers. An expression is derived for the scale height of turbulence, which should be considered as an important parameter in selecting new sites for astronomical observations. The performance of adaptive optical systems is usually described in terms of Strehl ratios. The results of computations of the whole transfer function for long exposure compensated images are presented. It is shown that the point-spread function for a partially compensated image generally consists of an Airy disk surrounded with a halo. The ratio of the energy in the Airy disk over the energy in the halo is independent of the telescope aperture and provides a better measure of the quality of the compensation.

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