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Proceedings Paper

Influence of the laser pulse length and shape on the damage threshold of UV optics
Author(s): Klaus R. Mann; Harald Gerhardt; G. Pfeifer; Reinhard Wolf
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Paper 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 t0.5- 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.

Paper Details

Date Published: 29 July 1992
PDF: 8 pages
Proc. SPIE 1624, Laser-Induced Damage in Optical Materials: 1991, (29 July 1992); doi: 10.1117/12.60133
Show Author Affiliations
Klaus R. Mann, Laser-Lab. Goettingen (Germany)
Harald Gerhardt, Laser-Lab. Goettingen (Germany)
G. Pfeifer, Ingenieurhochschule Mittweida (Germany)
Reinhard Wolf, Ingenieurhochschule Mittweida (Germany)

Published in SPIE Proceedings Vol. 1624:
Laser-Induced Damage in Optical Materials: 1991
Harold E. Bennett; Lloyd L. Chase; Arthur H. Guenther; Brian Emerson Newnam; M. J. Soileau, Editor(s)

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