Effect of telecentric use of narrow-band filters on diffraction-limited imaging

Jacques Maurice Beckers

doi:10.1117/12.316815

9 July 1998 Effect of telecentric use of narrow-band filters on diffraction-limited imaging

Jacques Maurice Beckers

Proceedings Volume 3355, Optical Astronomical Instrumentation; (1998) https://doi.org/10.1117/12.316815
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

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 illumiatnon of the pupil when viewed from behind the fitler. 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.

Citation Download Citation

Jacques Maurice Beckers "Effect of telecentric use of narrow-band filters on diffraction-limited imaging", Proc. SPIE 3355, Optical Astronomical Instrumentation, (9 July 1998); https://doi.org/10.1117/12.316815

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