Year: 2016
Type: article
Abstract: In this study, we observed the dynamics inside a calcium fluoride (CaF2) single crystal following photoexcitation by a tightly focused femtosecond laser pulse. This observation method is based on a pumpprobe method and a polarization microscope. The observed dynamics indicated the generation of a stress wave and cracks generated from the photoexcited region. The stress wave had a characteristic shape due to anisotropy of the crystal’s elastic properties. The crack propagation occurred along the (110) planes. We determined the time evolution of the stress in a stress wave and estimated the temperature elevation in the photoexcited region by comparing our observed results with the results from a thermo-elastic simulation. The simulation results of the stress at a temperature elevation of 1000 K in the photoexcited region were in good agreement with our experimental results in the <100> directions, but we obtained lower stress values in the <110> directions. This discrepancy may be due to the fact that the thermo-elastic simulation did not take the influence of crack generation into consideration.
Author: Yoshinaga, Kohei
Language: Japanese
Subfield: Industrial and Manufacturing Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7067415449