Effect of spatial temperature profile, which can be introduced due to illumination of an amorphous material by a focused ultra-short laser pulse, on different physical parameters of the material is studied by numerically solving thermoelastic wave equations by using Finite Element Method. It is observed that temperature profile in the focal region has significant effect on the spatial and temporal behavior of the displacement, strain, stress, and consequently, refractive index of the material. Therefore, assuming temperature profile as uniform or similar to the initial laser pulse profile may lead to inaccurate results, and are should take into account nonlinear effects during pulse propagation and the resulting temperature profile.

Keywords: Refractive Index, Temperature Profile, Material Processing, thermoelastic wave equations, Ultra-Short pulse laser

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