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Effects of film stress in laser-induced damage

Investigations of reduced laser-induced damage thresholds in dielectric coatings when tested under vacuum show that film stress is one of the contributors to this effect. Also, there are a number of different approaches to ensure wavefront integrity of surfaces that high stress films have been applied to. To not only identify optimum wavefront integrity but also optimum laser-induced damage threshold, a specific set of samples has been designed, coated and tested. This paper reports on these results, based on films produced in an ion beam sputtering process.