Wædegaard, Kristian Juncher2; Frislev, Martin Thomas2; Balling, Peter2
1 Department of Physics and Astronomy, Science and Technology, Aarhus University2 Department of Physics and Astronomy, Science and Technology, Aarhus University
Modeling of the interaction between a dielec- tric material and ultrashort laser pulses provides the tem- poral evolution of the electronic excitation and the optical properties of the dielectric. Experimentally determined re- flectances and ablation depths for sapphire are compared to the calculations. A decrease in reflectance at high fluences is observed experimentally, which demonstrates the neces- sity of a temperature-dependent electron scattering rate in the model. The comparison thus provides new constraints on the optical parameters of the model.
Applied Physics a, 2013, Vol 110, Issue 3, p. 601-605