Ultrafast Photon-Electron Interactions in Dielectrics by a Single Laser Pulse
This study develops a quantum mechanical model to investigate energy absorption in ultrafast laser of dielectrics. The model investigates the optical property variations, electron temperature, and density changes at femtosecond scales. The ionizations and electron heating are two major factors considered for pulse absorption occurring within the pulse duration. The flux-doubling model is employed to calculate the free electron generation mainly through impact ionization and photoionization. The quantum mechanical treatments are used to account for the specific heat and the relaxation time for free electrons. The time and space dependent optical properties of the dense plasma generated by the ultrafast laser pulse are calculated. The predictions of ablation threshold and ablation depth of fused silica and barium aluminum borosilicate (BBS) are in good agreements with published experimental data. The model greatly improves the accuracy in predicting the ablation depth and can predict the crater shape.
L. Jiang and H. Tsai, "Ultrafast Photon-Electron Interactions in Dielectrics by a Single Laser Pulse," 2004 ASME International Mechanical Engineering Congress and Exposition, November 2004, American Society of Mechanical Engineers (ASME), Nov 2004.
Mechanical and Aerospace Engineering
Keywords and Phrases
Flux-Doubling Model; Free Electrons; Photoionization; Quantum Mechanics; Vaporization
Article - Conference proceedings
© 2004 American Society of Mechanical Engineers (ASME), All rights reserved.