Femtosecond laser-induced damage in absorbing filters used for laser protection

Joerg Krueger; Matthias Lenzner; Sven Martin; Miklos Lenner; Christian Spielmann; Andreas Fielder; Wolfgang Kautek

doi:10.1117/12.482109

13 September 2002 Femtosecond laser-induced damage in absorbing filters used for laser protection

Joerg Krueger, Matthias Lenzner, Sven Martin, Miklos Lenner, Christian Spielmann, Andreas Fielder, Wolfgang Kautek

Proceedings Volume 4760, High-Power Laser Ablation IV; (2002) https://doi.org/10.1117/12.482109
Event: International Symposium on High-Power Laser Ablation 2002, 2002, Taos, New Mexico, United States

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.

Citation Download Citation

Joerg Krueger, Matthias Lenzner, Sven Martin, Miklos Lenner, Christian Spielmann, Andreas Fielder, and Wolfgang Kautek "Femtosecond laser-induced damage in absorbing filters used for laser protection", Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); https://doi.org/10.1117/12.482109

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