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Proceedings Paper

Femtosecond laser damage in diamond and its modeling
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Paper Abstract

Using our previously reported model of femtosecond laser ionization in bulk solid dielectrics, density of point defects in a focal volume of arbitrary solid dielectric is predicted as a function of laser intensity Ilas. This dependence shows a nonlinear increase with an exponent 3S (where S is the minimum number of laser photons to excite a carrier in a dielectric material over its bandgap) below a certain threshold intensity Ibreak and with an exponent S above the threshold. Assuming that these point defects coalesce within the focal volume and the volume of the resulting spherical void is proportional to the total number of point defects generated (the point defect density times the focal volume), theoretical curves of void diameter vs. Ilas are obtained, exhibiting non-linear increase with the exponents S for Ilas<Ibreak and S/3 for Ilas>Ibreak, respectively. Comparison of these theoretical predictions with experimental data on femtosecond laser microstructuring of diamond demonstrates their good agreement and gives a new insight into damage mechanisms of bulk solid dielectrics irradiated by ultrashort laser pulses.

Paper Details

Date Published: 7 February 2006
PDF: 8 pages
Proc. SPIE 5991, Laser-Induced Damage in Optical Materials: 2005, 59910V (7 February 2006); doi: 10.1117/12.638602
Show Author Affiliations
Sergey I. Kudryashov, Arkansas State Univ. (United States)

Published in SPIE Proceedings Vol. 5991:
Laser-Induced Damage in Optical Materials: 2005
Gregory J. Exarhos; Arthur H. Guenther; Keith L. Lewis; Detlev Ristau; M.J. Soileau; Christopher J. Stolz, Editor(s)

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