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Proceedings Paper

Applications of reverse engineering in the fabrication of optical coatings with high performance
Author(s): XiLin Yao; ChangXin Xiong; ChangCheng Yang; NanChun Tong
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Paper Abstract

"Reverse Engineering" attempts to derive information about the makeup of an existing optical coating from optical spectrum measurements, usually of performance, which can be converted into targets for inverse optimization synthesis. In the method of inverse synthesis, optimization targets are measured spectral data, the starting design is the original theoretical design and the final results gives more actual indices, layer thickness, dispersive index functions and material tooling factors, or some of them by selected optimization for multi-layers. This paper presents some new optimization methods, such as gradually constrained optimization approach, subsection synthesis, accelerating optimization model, etc. The methods applies to all kinds of transmission spectra and do not rely on the existence of interference fringe patterns or transparency. Through a lot of experiments of the films Ta2O5, TiO2 under different ion-assisted deposition (IAD) conditions, the deviation between the measured and the theoretical spectra data is less than 0.52% in p-order model merit function, which shows that these methods are reliable. With "Reverse Engineering" for multi-layers, we have successfully manufactured 400-700nm broadband antireflection coatings (average reflectivity is around 0.25%, maximum reflectivity is on more than 0.35%) and broadband beam splitters (R/T=30:70 for a 45 degree angle of incidence, average reflectivity deviation is less than 2.5% in visible spectral region). Of course, many difficulties have not still been overcome, especially for multi-layers.

Paper Details

Date Published: 1 February 2006
PDF: 10 pages
Proc. SPIE 6034, ICO20: Optical Design and Fabrication, 60341I (1 February 2006); doi: 10.1117/12.668154
Show Author Affiliations
XiLin Yao, Huazhong Institute of Electronics and Optics (China)
ChangXin Xiong, Huazhong Institute of Electronics and Optics (China)
ChangCheng Yang, Huazhong Institute of Electronics and Optics (China)
NanChun Tong, Huazhong Institute of Electronics and Optics (China)

Published in SPIE Proceedings Vol. 6034:
ICO20: Optical Design and Fabrication
James Breckinridge; Yongtian Wang, Editor(s)

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