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Proceedings Paper

Energy dissipation during laser breakdown in solids
Author(s): Barry Ward; David C. Emmony
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Paper Abstract

A Q-switched Nd:YAG laser had been used to damage perspex. Damage was initiated on the entry face and within the bulk of the material. Acoustic transients or shock waves were produced centered on the laser focus and high spatial and temporal resolution Mach Zehnder interferometry was used to measure the acoustic pressure field associated with the interaction. The well defined laser pulse had an energy of 4.6 +/- 0.2 mJ with a corresponding energy fluence of 260 J cm-2. This is approximately an order of magnitude larger than the bulk damage threshold at 1.06 mm. Abel inversion and integration of the interferograms gave the total energy dissipated in the polymer in the form of acoustic transients, which was approximately 4 (mu) J. This result suggests that most of the laser pulse is either used to produce the damage void or scattered without absorption from the damage site.

Paper Details

Date Published: 29 July 1992
PDF: 10 pages
Proc. SPIE 1624, Laser-Induced Damage in Optical Materials: 1991, (29 July 1992); doi: 10.1117/12.60109
Show Author Affiliations
Barry Ward, Loughborough Univ. of Technology (United Kingdom)
David C. Emmony, Loughborough Univ. of Technology (United Kingdom)

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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