Zenith-Distance Dependence of Chromatic Shear Effect: A Limiting Factor for an Extreme Adaptive Optics System

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dc.creatorNakajima, Tadashi
dc.date2006-08-17
dc.date.accessioned2026-07-07T10:39:48Z
dc.date.available2026-07-07T10:39:48Z
dc.descriptionConsider a perfect AO system with a very fine wavefront sampling interval and a very small actuator interval. If this AO system senses wavefront at a wavelength, lambda_{WFS}, and does science imaging at another wavelength, lambda_{SCI}, the light paths through the turbulent atmosphere at these two wavelengths are slightly different for a finite zenith distance, z. The error in wavefront reconstruction of the science channel associated with this non-common path effect, or so-called chromatic shear, is uncorrectable and sets an upper bound of the system performance. We evaluate the wavefront variance, sigma^2(lambda_{WFS},lambda_{SCI},z) for a typical seeing condition at Mauna Kea and find that this effect is not negligible at a large z. If we require that the Strehl ratio be greater than 99 or 95%, z must be less than about 50 or 60 deg respectively, for the combination of visible wavefront sensing and infrared science imaging.
dc.descriptionTo appear in 2006/12/01 issue of ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0608388
dc.identifierhttp://arxiv.org/abs/astro-ph/0608388
dc.identifierAstrophys.J.652:1782-1786,2006
dc.identifierdoi:10.1086/508418
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181158
dc.subjectAstrophysics
dc.titleZenith-Distance Dependence of Chromatic Shear Effect: A Limiting Factor for an Extreme Adaptive Optics System
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