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Proceedings Paper

Manufacturing of linear variable filters with straight iso-thickness lines
Author(s): Laetitia Abel-Tiberini; Frédéric Lemarquis; Gérard Marchand; Luc Roussel; Gérard Albrand; Michel Lequime
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Paper Abstract

Linear variables filters are band-pass multilayer coatings manufactured with a thickness gradient that allows a significant wavelength shift of the centring wavelength of the filter according to the point that is illuminated. In case such a filter is associated with a 2D matrix detector in order to form a compact spectrometer, iso-thickness lines must be as straight as possible, perpendicularly to the thickness gradient. To answer this problem, we developed a masking mechanism that combine the classical rotation movement of substrates and a translation movement for the mask, this last movement being induced during the rotation by the mean of a cam. Thickness gradient can be freely adjusted according to specifications, while transverse uniformity is 99.9%.

Paper Details

Date Published: 4 October 2005
PDF: 9 pages
Proc. SPIE 5963, Advances in Optical Thin Films II, 59630B (4 October 2005); doi: 10.1117/12.624779
Show Author Affiliations
Laetitia Abel-Tiberini, Institut Fresnel, CNRS, Univ. Paul Cézanne (France)
Frédéric Lemarquis, Institut Fresnel, CNRS, Univ. Paul Cézanne (France)
Gérard Marchand, Institut Fresnel, CNRS, Univ. Paul Cézanne (France)
Luc Roussel, Institut Fresnel, CNRS, Univ. Paul Cézanne (France)
Gérard Albrand, Institut Fresnel, CNRS, Univ. Paul Cézanne (France)
Michel Lequime, Institut Fresnel, CNRS, Univ. Paul Cézanne (France)


Published in SPIE Proceedings Vol. 5963:
Advances in Optical Thin Films II
Claude Amra; Norbert Kaiser; H. Angus Macleod, Editor(s)

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