title: Distortion induced effects on the finesse of high-performance large-aperture Fabry-Perot etalon filters.
abstract: The effect of thickness uniformity and distortion on the performance of large-aperture Fabry-Perot etalon filters is investigated. It is shown that for etalons currently being used for solar observation it is important to consider the effect of distortion due to mounting and to gravity when in use. It is further shown that the effects of distortion can be largely avoided by operating the etalon at or near normal incidence.
authors.forename: J
authors.initials: J
authors.lastname: Zhang
authors.forename: J W
authors.initials: JW
authors.lastname: Arkwright
authors.forename: D I
authors.initials: DI
authors.lastname: Farrant