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Results are presented which provide information about the correlation between deposition parameters (Assistance, choice of working gas) and the optical properties of the films. Correlations between optical and non-optical (stress, EDXresults) properties are further presented and discussed in terms of classical models. Reproducibility issues are discussed, too.
Silver is a noble metal. However, corrosion activators (e.g. S and Cl) can lead to corrosion. Thus, a protective layer is required to prevent the corrosion and sustain the high reflectivity of the mirror. However, damage of the Ag-coating can occur, even in the case of protected-Ag. Inhomogeneous film growth of the protective layer can lead to a permeation of corrosion activators and thus to a damage of the Ag. But also the deposition of impervious protective layers is not sufficient for long-term environmental stability. Hygroscopic air borne particles can weaken the protection and therefore subsequently lead to a permeation of corrosion activators and thus to a damage of the Ag.
These damage mechanisms lead to criteria for a durable and efficient protection. AlOxNy and nanolaminates have been tested with respect to these criteria. In particular the protection based on nanolaminates shows a great potential for the protection of Ag. In addition, also the optical performance can be improved by UV-enhancement based on different nanolaminates.
Different coating options were evaluated in order to provide the necessary high reflectivity and a satisfactory laser damage threshold for ultrashort laser pulses in the few ps to fs regime at λ = 1030 nm. High-reflective metal layers enhanced by dielectric HfO2/SiO2 stacks were found to be the most advantageous coating option due to their comparatively small thickness and measured damage thresholds above 1 J/cm2@8ps.
This will count as one of your downloads.
You will have access to both the presentation and article (if available).
The course provides attendees with basic knowledge on the properties of optical coatings. The first part starts with a brief introduction into the classical theory of optical constants of metals and dielectrics, followed by a short discussion of reflection at interfaces and interference of light in thin films. The first part concludes with selected examples of multilayer optical coatings design and properties such as edge filters, bandpass filters, and more.
The second part of the course deals with the technical processes of coating preparation and characterization. It starts from the basics of vacuum technology, followed by the description of most impor-tant coating technologies, relevant characterization techniques and application examples.
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