Abstract
Structural and energy dynamics after femtosecond laser irradiation inside glasses have been investigated by a transient lens (TrL) method. As the conventional TrL method is too simplistic to extract a complicated refractive index distribution (Δn), which is induced by focused femtosecond pulsed laser, we calculated the TrL signal based on the diffraction theory. From simulations of the observed TrL signal, we determined timedependence of pressure wave generation, pressure wave propagation, and thermal diffusion process. The material deformation and energy dissipation processes inside the material can be determined from this analysis of the TrL signal.
