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Proceedings Paper

Mechanisms of excimer laser ablation of strongly absorbing systems
Author(s): Charles E. Otis; Bodil Braren; Michael O. Thompson; D. Brunco; Peter M. Goodwin
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Paper Abstract

The absorption behavior of model polymeric systems is investigated in the low (< 50 mJ/cm2) and high (> 1 J/cm2) fluence regime at standard excimer laser ultraviolet wavelengths. The new technique of nanosecond time resolved thermometry is exploited to resolve the heating and cooling rate, as well as the total thermal load of a thin polymer film that is exposed to low fluence irradiation. The results suggest that a thermal model of heating and ablation is appropriate for these systems. This represents the first direct measurement of the time resolved heating of a strongly absorbing polymer system. In addition, a new nanosecond time resolved digital photographic technique has been used to image the shock wave and debris dynamics of a polymer undergoing high fluence ablation. These results suggest that, at high fluences, the total energy in the incident photon pulse can be entirely accounted for in the energy driving the shock wave.

Paper Details

Date Published: 24 June 1993
PDF: 11 pages
Proc. SPIE 1856, Laser Radiation Photophysics, (24 June 1993); doi: 10.1117/12.147610
Show Author Affiliations
Charles E. Otis, IBM Thomas J. Watson Research Ctr. (United States)
Bodil Braren, IBM Thomas J. Watson Research Ctr. (United States)
Michael O. Thompson, Cornell Univ. (United States)
D. Brunco, Cornell Univ. (United States)
Peter M. Goodwin, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 1856:
Laser Radiation Photophysics
Bodil Braren; Mikhail N. Libenson, Editor(s)

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