Diffraction in OWL: Effects of segmentation and segments edge misfigure

Details Diffraction in OWL: Effects of segmentation and segments edge misfigure Diffraction in OWL: Effects of segmentation and segments edge misfigure

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4840..171y&link_type=abstract

Future Giant Telescopes. Edited by Angel, J. Roger P.; Gilmozzi, Roberto. Proceedings of the SPIE, Volume 4840, pp. 171-182 (2

Physics

1

Scientific paper

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.

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