Share Email Print
cover

Proceedings Paper

Metal layer beamsplitters with one dielectric achromatisation layer
Author(s): M. Schürmann; W. Stöckl; N. Kaiser
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

A high refractive index dielectric layer of thickness λ/4 on the backside of a metal layer can reduce the absorption losses of metallic beamsplitters considerably. This was published by H. Pohlack in 1953. The practical importance of this knowledge may even be greater nowadays, as the availability of sputtering techniques makes the combination of metallic and dielectric layers within an optical coating much easier. In this contribution it will be shown, that the inclusion of dielectric layers into a metallic beamsplitter can possibly have further benefit. For some applications, where achromatic transmission and/or reflectance are needed, an additional dielectric layer can enhance the performance of a metallic beamsplitter. As an example the coating of a beamsplitter cube will be shown. The projected application of this cube demands a high reflection and only a low transmission over a spectral range from 400 nm to 800 nm. Using a metallic beamsplitter coating enhanced by a high refractive index dielectric layer it is possible to fulfil this demand with a comparably simple coating and at the same time to obtain a constant transmission of about 5% over a large spectral range.

Paper Details

Date Published: 25 September 2008
PDF: 5 pages
Proc. SPIE 7101, Advances in Optical Thin Films III, 71011J (25 September 2008); doi: 10.1117/12.797295
Show Author Affiliations
M. Schürmann, Fraunhofer Institute Applied Optics and Precision Mechanics (Germany)
W. Stöckl, Fraunhofer Institute Applied Optics and Precision Mechanics (Germany)
N. Kaiser, Fraunhofer Institute Applied Optics and Precision Mechanics (Germany)


Published in SPIE Proceedings Vol. 7101:
Advances in Optical Thin Films III
Norbert Kaiser; Michel Lequime; H. Angus Macleod, Editor(s)

© SPIE. Terms of Use
Back to Top