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Design of hybrid coatings composed of homogeneous layers and refractive index gradients

: Janicki, V.; Leitel, R.; Wilbrandt, S.; Stenzel, O.; Gäbler, D.; Kaiser, D.


Amra,C.; Kaiser, N.; Macleod, H.A. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Advances in Optical Thin Films II : SPIE Conference on Optical Systems Design, 12-16 September 2005, Jena, Germany
Bellingham/Wash.: SPIE, 2005 (SPIE Proceedings Series 5963)
ISBN: 0-8194-5981-X
Paper 59631D
Conference on Optical Systems Design <2005, Jena, Germany>
Conference Paper
Fraunhofer IOF ()
omnidirectional; mixing layer; gradient index; antireflection

Inhomogeneous coatings are promising for superior optical properties, e.g. broadband antireflection, in comparison to conventional HL-stack designs. Although a Iot of excellent theoretical work an optical behaviour of rugates and gradient index films has been done during the last decades, there is no real breakthrough in industrial fabrication. The realization of such coatings leads to an extensive and time-consuming computer-aided control, because of complicated layer designs with continuously changing refractive index gradients. We describe the design and optical performance of an omnidirectional antireflection coating that essentially represents a hybrid coating composed from homogeneous layers and linear refractive index gradient layers.