Graded-index AR coatings for large angles of inclination
| Autor: | Barrett G. Potter, C. J. Simmons, Edward Nashed Boulos, Mark F. Best, L.K. Downie, S.J. Pagano, Joseph H. Simmons |
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| Rok vydání: | 1994 |
| Předmět: |
Materials science
business.industry chemistry.chemical_element engineering.material Condensed Matter Physics Reflectivity Electronic Optical and Magnetic Materials law.invention Wavelength Optics Anti-reflective coating Coating chemistry law Angle of incidence (optics) Materials Chemistry Ceramics and Composites engineering Fluorine business Refractive index Single layer |
| Zdroj: | Journal of Non-Crystalline Solids. 178:166-175 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/0022-3093(94)90281-x |
| Popis: | Antireflective coatings consisting of a single layer of glass with a graded variation in refractive index offer advantages over multi-layer coatings. These include a weaker dependence on angle of incidence at large angles and a flatter response to different wavelenghts over the visible. Consequently, graded-index films are desirable in automotive applications where colorless coatings are required. A sol-gel process is presented for the formation of a graded-index coating of MgOSiO2 with in-diffused fluorine. Refractive index variations over a range 1.46-1.40 are achieved over a few hundred micrometers. A theoretical analysis of the angular and wavelength dependence of the reflectivity of uncoated, single-layer coated, triple-layer coated and graded-index-layer coated samples was performed and compared with experimentally derived films. Good agreement between model and experiment was observed. |
| Databáze: | OpenAIRE |
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