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Published on: May 29, 2018
Investigation of optical nonlinearities and transient dynamics in a stilbenzene derivative
Junyi Yang1, Yinglin Song, Weiju Zhu
1School of Physical Science and Technology, Soochow University, Suzhou 215006, P. R. China.
Abstract:
The temporal properties of nonlinear absorption of a stilbenzene derivative have been investigated by time-resolved pump-probe techniques with picosecond laser pulses at the wavelength of 532 nm. With the help of an additional nanosecond and picosecond open-aperture Z-scan technique, numerical simulations based on a new five-energy level model are used to interpret the experimental results, and the nonlinear optical parameters of this new compound are determined. The five-energy level model is described by two-photon absorption (TPA) excited from ground-state-induced excited-state absorption (ESA) including singlet ESA and triplet ESA. Under the nanosecond pulse excitation, a TPA excited from the triplet excited state contributes to the nonlinear absorption, and the value of the TPA is found to be 1 order of magnitude larger than those usually found for TPA excited from the ground state.
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