Investigation of two-photon absorption induced excited state absorption in a fluorenyl-based chromophore.
Two-photon absorption induced excited state absorption in the solution of a new fluorenyl-based chromophore is investigated by a time-resolved pump-probe technique using femtosecond pulses. With the help of an additional femtosecond open-aperture Z-scan technique, numerical simulations based on a three-energy level model are used to interpret the experimental results, and we determine the nonlinear optical parameters of this new chromophore uniquely. Large two-photon absorption cross section and excited state absorption cross section for singlet excited state are obtained, indicating a good candidate for optical limiting devices. Moreover, the influence of two-beam coupling induced energy transfer in neat N,N'-dimethylformamide solvent is also considered, although this effect is strongly restrained by the instantaneous two-photon absorption.
Li
Changwei
C
Department of Physics, Harbin Institute of Technology, Harbin 150001, PR China.
Yang
Kun
K
Feng
Yan
Y
Su
Xinyan
X
Yang
Junyi
J
Jin
Xiao
X
Shui
Min
M
Wang
Yuxiao
Y
Zhang
Xueru
X
Song
Yinglin
Y
Xu
Hongyao
H