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Proceedings Paper

Diffraction in OWL: effects of segmentation and segments edge misfigure
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Paper Abstract

We consider the diffraction by segmented apertures with a very large number of segments, concentrating mostly on the effects which lead to the appearance of regular patterns of diffraction peaks, specific to extremely large telescopes (ELT). These effects are associated to gaps between segments, turned down/up segment edges and random tip-tilt errors. We discuss briefly the effect of segment piston error, which does not produce the higher-order diffraction peaks, but also affect the image quality. We deliver an analytical expression of the Point Spread Function (PSF) associated to each particular case and approximate formulae for the Strehl ratio and relative intensity of higher-order diffraction peaks.

Paper Details

Date Published: 30 January 2003
PDF: 12 pages
Proc. SPIE 4840, Future Giant Telescopes, (30 January 2003); doi: 10.1117/12.459957
Show Author Affiliations
Natalia Yaitskova, European Southern Observatory (United States)
Kjetil Dohlen, Lab. d'Astrophysique de Marseille (United States)
Philippe Dierickx, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 4840:
Future Giant Telescopes
J. Roger P. Angel; Roberto Gilmozzi, Editor(s)

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