2D simulation of the absorbed energy distribution in a fused silica for the laser pulse duration of and the maximum intensity of in the focal plane at . This corresponds to the pulse energy of for a 3D cylindrical beam. The distribution is normalized to the maximum value which is in this case.
Spatial distribution of the laser fluence obtained in a 2D simulation in silica for the laser pulse duration of and the maximum intensity of in the focal plane at . This corresponds to the pulse energy of for a 3D cylindrical beam. Top: The case where the ionization is taken into account. The laser fluence is normalized to its maximum value of . Bottom: The same case where the ionization is switched off. The laser fluence is normalized to its maximum value of .
Dependence of fraction of absorbed laser energy on the incident laser intensity with (2) and without (1) the Kerr effect taken into account for a laser pulse duration. 2D simulations.
Spatial dependence of the refractive index along the laser propagation axis. (a) The real part of without (1) and with (2) the Kerr effect for a fused silica. Curve (3) shows the dependence of the local absorption coefficient on the coordinate. (b) Contributions to the refractive index related to the non ionized atoms (3) and the imaginary (2) and real (1) parts of the free electron contribution.
Dependence of the laser absorption coefficient in the vicinity of the focal plane in fused silica on the laser pulse duration from the 2D simulations without (1) and with (2) dispersive effects.
3D overview of the ionized zone, with a scale in colors representing the free electrons density contours. In deep red (the far right of the spectrum shown) is the isodensity corresponding to . The arrow shows the laser pulse propagation direction.
Radial distribution of the pressure (a) and the specific energy (b) on the radius for several time moments calculated with the Taylor self-similar explosion model.
Density distribution at in the fused silica for the energy deposition of calculated with the QEOS. The axes are in micrometers.
Density (a) and pressure (b) distributions at in the fused silica for the case of energy deposition calculated with the SESAME table 7387. The axes are in micrometers.
Comparison of the density distributions at in the fused silica for the case of deposited energy: SESAME 7387 table (upper part), and the semi-analytic EOS (bottom part). Panel a—IL0005; panel b—IL0006; panel c—IL0007. The axes are in micrometers.
Radial pressure profiles for several time moments calculated with the SESAME table 7387 (a) and the IL0007 EOS (b).
Density distribution at in silica for the laser energy deposition calculated with the EOS IL0005. The axes are in micrometers.
Dependence of the cavity diameter on the deposited laser energy in the fused silica: circles—the empirical model (Ref. 2); diamonds—simulations with the EOS IL0005; triangles—experimental data (Ref. 2).
The parameters of EOS for the fused silica used in simulations.
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