20 April 1998 Oxygen-enriched binary composite films for high-power laser applications
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In recent years, the emergence of novel composite films has created considerable interest in development of complex optical coatings for high power laser applications. In the present work, oxygen pressure dependent tunability in optical and structural properties of a mixed- composite thin film material in solid solution has been investigated. It was observed that optical properties of mixed oxide films are greatly influenced by the chemical composition and microstructural changes under various oxygen pressure conditions. Atomic force microscopy is used to study such structural and morphological changes. Energy dispersive x-ray analysis using the feature of a scanning electron microscope made evident the correlation between the oxygen enrichment and tunability in the film refractive index. Since oxygen pressure can be dynamically varied during a deposition process, coatings constructed of suitable mixed- composite thin films can benefit from continuous modulation of the index of refraction eliminating the discrete interfaces. Electric field distributions within several multilayer- equivalent optical coatings developed by a step modulation approach have also been analyzed.
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N. K. Sahoo, N. K. Sahoo, Alan P. Shapiro, Alan P. Shapiro, "Oxygen-enriched binary composite films for high-power laser applications", Proc. SPIE 3244, Laser-Induced Damage in Optical Materials: 1997, (20 April 1998); doi: 10.1117/12.307027; https://doi.org/10.1117/12.307027

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