Abstract
In this paper optical breakdown process in dielectrics induced by femtosecond pulsed lasers was calculated numerically and 3-dimensional footprint of the breakdown region was simulated. Rate equation was used to calculate the temporal and spatial evolution of free electron density. In these simulations the role of tunneling ionization in free electron generation has been considered. Also absorbed energy from the pulse via multiphoton and inverse bremsstrahlung absorption was calculated numerically. The results show that the absorption of the propagating laser through the initially transparent dielectric is important and its ignorance may results in significant error in estimating the breakdown geometry, and volume. According to the simulation results in compare with our previous calculations, smaller and asymmetrical breakdown footprint is obtained if the absorption is considered in the calculations.
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