Influence of the laser pulse length and shape on the damage threshold of UV optics

Klaus R. Mann; Harald Gerhardt; G. Pfeifer; Reinhard Wolf

doi:10.1117/12.60133

29 July 1992 Influence of the laser pulse length and shape on the damage threshold of UV optics

Klaus R. Mann, Harald Gerhardt, G. Pfeifer, Reinhard Wolf

Proceedings Volume 1624, Laser-Induced Damage in Optical Materials: 1991; (1992) https://doi.org/10.1117/12.60133
Event: Laser-Induced Damage in Optical Materials: 1991, 1991, Boulder, CO, United States

Abstract

Investigations of the pulse length dependence of laser induced damage thresholds in the ultraviolet range suffer from the limited possibilities to increase the excimer laser pulse duration. The presented paper describes the application of an external pulse extension unit for damage threshold measurements with an effective pulse length from 25 to 200 ns at 248 nm. High accuracy results were obtained due to the fact that the same laser spot size and spatial profile as well as the same damage detection scheme could be used for all pulse durations. Especially the results for bare and single layer coated substrates strongly support a t^0.5- law of the damage threshold, which is the indication for a thermal breakdown mechanism. First results on double pulse experiments with different separation and amplitude ratios of the pulses reveal interesting details of the interaction process between laser radiation and optical surfaces.

Citation Download Citation

Klaus R. Mann, Harald Gerhardt, G. Pfeifer, and Reinhard Wolf "Influence of the laser pulse length and shape on the damage threshold of UV optics", Proc. SPIE 1624, Laser-Induced Damage in Optical Materials: 1991, (29 July 1992); https://doi.org/10.1117/12.60133

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