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Appl Opt. 2006 Mar 1;45(7):1502-6.

Application of optical broadband monitoring to quasi-rugate filters by ion-beam sputtering.

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Laser Zentrum Hannover, Hollerithallee 8, 30419 Hannover, Germany.


Methods for the manufacture of rugate filters by the ion-beam-sputtering process are presented. The first approach gives an example of a digitized version of a continuous-layer notch filter. This method allows the comparison of the basic theory of interference coatings containing thin layers with practical results. For the other methods, a movable zone target is employed to fabricate graded and gradual rugate filters. The examples demonstrate the potential of broadband optical monitoring in conjunction with the ion-beam-sputtering process. First-characterization results indicate that these types of filter may exhibit higher laser-induced damage-threshold values than those of classical filters.


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