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Proceedings Paper

Physics of high-average-power repetitively pulsed laser ablation of dielectric materials
Author(s): Manfred Hugenschmidt; Ruediger Schmitt; Jean-Pierre Moeglin; Karl Daree; Harmut Borchert
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Paper Abstract

The present paper deals with the impact of pulsed laser radiation on dielectric and semi-conducting materials. Energy trans-fer leads to fast heating and thermal ablation. Mechanical stresses additionally cause deteriorations, cracks, fragmentation or perforation. These processes develop quasi-explosively even at low energy levels. Laser effects are discussed using microsecond(s) - to ps- pulses, acting both on optically passive and active materials (optical sensors). Evaluations of plasma-sustained en-ergy transfer by the impact of ns-pulses in comparison to ps-pulses are included as well. In the medium energy range by contrast, target effects are considered which require three to four orders of magnitude higher energies per pulse and corre-spondingly higher average powers which in the burst mode are determined by the repetition rate. The repetitively pulsed CO2-laser at ISL provides energies up to 150 J, repetition rates up to100 pps, an average power of 15 kW corresponding to peak power values of 75 MW for 2 microsecond(s) pulses. This laser provides a valuable tool, particularly suited for large area out-of-band target studies. Thermo-mechanical processes, as experimentally observed are discussed and compared with results of numerical simulation. Transparency changes of optics due to ablation as quantitatively measured by the modulation trans-fer function are further included in the discussions.

Paper Details

Date Published: 13 September 2002
PDF: 12 pages
Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); doi: 10.1117/12.482077
Show Author Affiliations
Manfred Hugenschmidt, German-French Research Institute Saint-Louis (France)
Ruediger Schmitt, German-French Research Institute Saint-Louis (France)
Jean-Pierre Moeglin, German-French Research Institute Saint-Louis (France)
Karl Daree, German-French Research Institute Saint-Louis (France)
Harmut Borchert, German-French Research Institute Saint-Louis (France)

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

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