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Proceedings Paper

Comparison of gradient index and classical designs of a narrow band notch filter
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Paper Abstract

Rugate structures, as well as gradient refractive index films in general, attract a lot of interest. The gradient index systems may provide advantages in both, optical performance and mechanical properties of the optical coatings. Rugates have shown to be especially interesting for design of notch filters. A lot of theoretical work on design of rugate filters has been done in the last decades. However, only few of the designs could be deposited, which is often caused by practical problems, e.g. preparing materials with the desired refractive index values. In this paper two different gradient refractive index designs are compared to a classical high-low stack. One gradient design is synthesized by an apodized sinusoidal structure that is approximated by homogeneous sublayers. The other one is based on an apodized sinusoidal structure as well, but it is approximated by a hybrid structure, i.e. a combination of linear gradient index ramps between the lowest and the highest refractive index applicable and homogeneous layers of high index values. The two gradient designs take into account the constraints posed by limitations of the real deposition systems. Both designs are compared to a classical high-low stack and the advantages and drawbacks of each approach are commented.

Paper Details

Date Published: 5 October 2005
PDF: 7 pages
Proc. SPIE 5963, Advances in Optical Thin Films II, 59631O (5 October 2005); doi: 10.1117/12.624640
Show Author Affiliations
Vesna Janicki, Fraunhofer Institut für Angewandte Optik und Feinmechanik (Germany)
Ruder Boskovic Institute (Croatia)
Marc Lappschies, Laser Zentrum Hannover e.V. (Germany)
Björn Görtz, Laser Zentrum Hannover e.V. (Germany)
Detlev Ristau, Laser Zentrum Hannover e.V. (Germany)
Uwe Schallenberg, mso jena Mikroschichtoptik GmbH (Germany)
Olaf Stenzel, Fraunhofer Institut für Angewandte Optik und Feinmechanik (Germany)
Norbert Kaiser, Fraunhofer Institut für Angewandte Optik und Feinmechanik (Germany)


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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