Femtosecond laser damage in diamond and its modeling

Sergey I. Kudryashov

doi:10.1117/12.638602

7 February 2006 Femtosecond laser damage in diamond and its modeling

Sergey I. Kudryashov

Proceedings Volume 5991, Laser-Induced Damage in Optical Materials: 2005; 59910V (2006) https://doi.org/10.1117/12.638602
Event: Boulder Damage Symposium XXXVII: Annual Symposium on Optical Materials for High Power Lasers, 2005, Boulder, CO, United States

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 I_las. 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 I_break 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. I_las are obtained, exhibiting non-linear increase with the exponents S for I_las<I_break and S/3 for I_las>I_break, 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.

Citation Download Citation

Sergey I. Kudryashov "Femtosecond laser damage in diamond and its modeling", Proc. SPIE 5991, Laser-Induced Damage in Optical Materials: 2005, 59910V (7 February 2006); https://doi.org/10.1117/12.638602

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