Manufacturing of linear variable filters with straight iso-thickness lines

Laetitia Abel-Tiberini; Frédéric Lemarquis; Gérard Marchand; Luc Roussel; Gérard Albrand; Michel Lequime

doi:10.1117/12.624779

4 October 2005 Manufacturing of linear variable filters with straight iso-thickness lines

Laetitia Abel-Tiberini, Frédéric Lemarquis, Gérard Marchand, Luc Roussel, Gérard Albrand, Michel Lequime

Proceedings Volume 5963, Advances in Optical Thin Films II; 59630B (2005) https://doi.org/10.1117/12.624779
Event: Optical Systems Design 2005, 2005, Jena, Germany

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%.

Citation Download Citation

Laetitia Abel-Tiberini, Frédéric Lemarquis, Gérard Marchand, Luc Roussel, Gérard Albrand, and Michel Lequime "Manufacturing of linear variable filters with straight iso-thickness lines", Proc. SPIE 5963, Advances in Optical Thin Films II, 59630B (4 October 2005); https://doi.org/10.1117/12.624779

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