Laser-induced damage of rugate and quarter-wave stacks high reflectors deposited by ion-beam sputtering

Classicalrugate filter refers to layer system which has modulatedsinusoidal refractive index variation. The continuous chang-ingofrefractiveindexisverydifficulttorealize.Forthetech-nical realization convenience, an approximation of a rugatefilter through stepped-index profile seems to be a suitableapproach.

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