title: Mass transport following impulsive optical excitation.
abstract: Transition from reverse-saturable absorption to saturable absorption of the chloroaluminum phthalocyanine solution excited by a giant laser pulse is ascribed not just to the saturation of excited state absorption, but also to the outward migration of the solute molecules at the laser beam center. While the saturation of excited state absorption occurs within a single picosecond laser pulse, the beam center population decrease is sustained much longer than the pulse duration. We distinguish these two mechanisms with the Z-scan technique, utilizing picosecond pulses with pulse-to-pulse separations ranging from 0.1 to 5.0 s.
authors.affiliation: Department of Physics, National Chung-Cheng University, Ming-Hsiung, Chia-Yi 621, Taiwan, Republic of China. twei@phy.ccu.edu.tw
authors.forename: Tai-Huei
authors.initials: TH
authors.lastname: Wei
authors.forename: Chi-Chen
authors.initials: CC
authors.lastname: Wang
authors.forename: Tzung-Tao
authors.initials: TT
authors.lastname: Wu
authors.forename: Chen-Wei
authors.initials: CW
authors.lastname: Chen
authors.forename: Xin-Biao
authors.initials: XB
authors.lastname: Li
authors.forename: Tzer-Hsiang
authors.initials: TH
authors.lastname: Huang
authors.forename: Sidney
authors.initials: S
authors.lastname: Yang
authors.forename: Tai-Ying
authors.initials: TY
authors.lastname: Wei