Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003josaa..20.1563y&link_type=abstract
Optical Society of America Journal, Volume 20, Issue 8, pp. 1563-1575 (2003).
Astronomy and Astrophysics
Astronomy
5
Astronomical Telescopes, Optical Transfer Function, Speckle, Light Diffraction, Mirrors, Optical Design Techniques
Scientific paper
We present an analysis of the diffraction effects from a segmented aperture with a very large number of segments-prototype of the next generation of extremely large telescopes. This analysis is based on the point-spread-function analytical calculation for Keck-type hexagonal segmentation geometry. We concentrate on the effects that lead to the appearance of speckles and/or a regular pattern of diffraction peaks. These effects are related to random piston and tip-tilt errors on each segment, gaps between segments, and segment edge distortion. We deliver formulas and the typical numerical values for the Strehl ratio, the relative intensity of higher-order diffraction peaks, and the averaged intensity of speckles associated with each particular case of segmentation error.
Dierickx Philippe
Dohlen Kjetil
Yaitskova Natalia
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