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Proceedings Paper

Femtosecond laser-induced damage in absorbing filters used for laser protection
Author(s): Joerg Krueger; Matthias Lenzner; Sven Martin; Miklos Lenner; Christian Spielmann; Andreas Fielder; Wolfgang Kautek
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Paper Abstract

Damage experiments of absorbing filters (Schott BG18 and BG36) were performed with Ti:sapphire laser pulses with durations from 30 fs to 340 fs (800 nm, 1 kHz) in air. The direct focusing technique was employed under single- and multi-pulse irradiation conditions. Ablation threshold fluences were determined from a semi-logarithmic plot of the ablation crater diameter vs. laser fluence. The damage threshold fluence decreases for shorter pulse durations. In the investigated pulse duration range, the measured multi-pulse ablation threshold fluences are practically similar to those of undoped glass material (~1 Jcm-2). That means that the multi-pulse ablation threshold is independent on the doping level of the filters. For more than 100 pulses per spot and all pulse durations applied, the threshold fluence saturates. This leads to technically relevant damage threshold values in the femtosecond laser pulse duration domain.

Paper Details

Date Published: 13 September 2002
PDF: 8 pages
Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); doi: 10.1117/12.482109
Show Author Affiliations
Joerg Krueger, Federal Institute for Materials Research and Testing (Germany)
Matthias Lenzner, Federal Institute for Materials Research and Testing (Germany)
Sven Martin, Federal Institute for Materials Research and Testing (Germany)
Miklos Lenner, Technische Univ. Wien (Austria)
Christian Spielmann, Technische Univ. Wien (Austria)
Andreas Fielder, Rupp and Hubrach Inferoptics (Germany)
Wolfgang Kautek, Federal Institute for Materials Research and Testing (Germany)

Published in SPIE Proceedings Vol. 4760:
High-Power Laser Ablation IV
Claude R. Phipps, Editor(s)

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