title: Formation mechanism of element distribution in glass under femtosecond laser irradiation.
abstract: We report on the formation mechanism of element distribution in glass under high-repetition-rate femtosecond laser irradiation. We simultaneously focused two beams of femtosecond laser pulses inside a glass and confirmed the formation of characteristically shaped element distributions. The results of the numerical simulation in which we considered concentration- and temperature-gradient-driven diffusions were in excellent qualitative agreement with the experimental results, indicating that the main driving force is the sharp temperature gradient. Since the composition of a glass affects its refractive index, absorption, and luminescence property, the results in this study provide a framework to fabricate a functional optical device such as optical circuits with a high-repetition-rate femtosecond laser.
authors.affiliation: Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan. m‐shimizu@curl1.kuic.kyoto‐u.ac.jp
authors.forename: Masahiro
authors.initials: M
authors.lastname: Shimizu
authors.forename: Masaaki
authors.initials: M
authors.lastname: Sakakura
authors.forename: Shingo
authors.initials: S
authors.lastname: Kanehira
authors.forename: Masayuki
authors.initials: M
authors.lastname: Nishi
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Shimotsuma
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Hirao
authors.forename: Kiyotaka
authors.initials: K
authors.lastname: Miura