[21a-A306-1~9] 3.6 Laser processing (formerly 3.7)

[21a-A306-3] Analytical formula on ionization rate in dielectrics under linearly polarized laser field

〇Mizuki Tani¹, Kenichi L. Ishikawa¹ (1.The Univ. of Tokyo)

Keywords:semiconductor, dielectrics, Keldysh theory

Several reports have shown that optical absorption of non-metallic materials is stronger under two-color lasers than under monochromatic lasers. In this study, we extend the Keldysh-like formula for the probability of electronic excitation under a monochromatic linearly polarized laser fields for insulators to the case of a two-color laser fields and apply it to an isotropic two-band model which mimics α-SiO2 (bandgap 9eV).