Ultrafast dynamics of the interaction between double-pulse femtosecond laser and silica glass

Abstract

Temporally shaping a single femtosecond (fs) laser pulse into a double-pulse (DP) mode has been demonstrated to be an efficient method for internal modifications of transparent dielectrics [1,2]. However, the mechanism of double-pulse propagation and excitation in dielectrics has not been well clarified. In this work, the ultrafast response of silica glass under the irradiation of a shot of DP fs laser is studied. The results are helpful for understanding the laser absorption into the excited electrons, as well as the microprocessing applications in integrated photonics.