NOAO Abstracts for SPIE Meeting in March
Effect of Telecentric Use of Narrow-Band Imaging Filters on
Diffraction Limited Imaging
Authors:
Jacques M. Beckers
Abstract:
Sometimes Fabry-Perot, and other narrow-band filters, are
used for astronomical imaging in the so-called telecentric mode. In it the
pupil is collimated through the filter, resulting in different incidence
angles on the filter for rays coming from different parts of the objective.
This results in variations of the central transmission wavelength, which
broaden the effective filter bandpath. In addition each wavelength within
this filter bandpath sees a different illumination of the pupil when viewed
from behind the filter. This causes the diffraction limited
point-spread-function to vary with wavelength. With the advent of
diffraction limited imaging using adaptive optics, this can cause
complications. In this paper, which elaborates further on research
published elsewhere, I examine the magnitude of this effect.
[NOAO at the SPIE Meeting in
March]
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P.O. Box 26732, Tucson, Arizona 85726 Phone: (520) 318-8000
Posted: 02Mar1998