Mass transport following impulsive optical excitation.
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.
Wei
Tai-Huei
TH
Department of Physics, National Chung-Cheng University, Ming-Hsiung, Chia-Yi 621, Taiwan, Republic of China. twei@phy.ccu.edu.tw
Wang
Chi-Chen
CC
Wu
Tzung-Tao
TT
Chen
Chen-Wei
CW
Li
Xin-Biao
XB
Huang
Tzer-Hsiang
TH
Yang
Sidney
S
Wei
Tai-Ying
TY