フェムト秒レーザーを用いた透明媒質内部加工における変形過程とエネルギー散逸過程の観測法 Methods for Observation of Material Deformations and Energy Dissipation Processes during a Femtosecond Laser Machining Inside Transparent Materials
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.
レーザー研究 35(2), 109-115, 2007-02-15
The Laser Society of Japan