Origin Of Negative Chi³ In Squaraines: Experimental Observation Of Two-Photon States
Document Type
Article
Publication Date
6-1-1994
Published In
Optics Letters
Abstract
Femtosecond pump-probe experiments performed on squaraines demonstrate strong couplings between the first excited state and high-lying two-photon states. The experimental data agree well with our earlier quantum many-electron calculations based on multiple-excited configuration interactions. We show that high-lying two-photon states in squaraines are critically important to understanding the observed third-order optical properties and that two-level models are inadequate even for molecules with negative third-order optical susceptibilities.
Recommended Citation
Y. Z. Yu et al.
(1994).
"Origin Of Negative Chi³ In Squaraines: Experimental Observation Of Two-Photon States".
Optics Letters.
Volume 19,
Issue 11.
786-788.
DOI: 10.1364/OL.19.000786
https://works.swarthmore.edu/fac-physics/187
