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|Title:||Excited-state enhancement of third-order optical nonlinearities: Photodynamics and characterization||Authors:||Gu, B.
|Issue Date:||20-Dec-2010||Citation:||Gu, B., Lou, K., Chen, J., Li, Y., Wang, H.-T., Ji, W. (2010-12-20). Excited-state enhancement of third-order optical nonlinearities: Photodynamics and characterization. Optics Express 18 (26) : 26843-26853. ScholarBank@NUS Repository. https://doi.org/10.1364/OE.18.026843||Abstract:||Based on the simplified five-level rate-equation theory, we investigate the hybrid third-order optical nonlinear processes which combine the instantaneous nonlinearity and the one-photon absorption induced excited-state nonlinearity. We obtain the analytical third-order nonlinear absorption and refraction coefficients originating from the singlet and triplet excited-state effects. We explore the photodynamic process and give the corresponding level diagram in the nanosecond, picosecond, and femtosecond regimes. We develop the pulse-duration-dependent Z-scan theory for characterizing the simultaneous instantaneous nonlinearity and cumulative effect of the excited-state nonlinearity. We also demonstrate the validity of the presented theory to analyze the experimental results. © 2010 Optical Society of America.||Source Title:||Optics Express||URI:||http://scholarbank.nus.edu.sg/handle/10635/96545||ISSN:||10944087||DOI:||10.1364/OE.18.026843|
|Appears in Collections:||Staff Publications|
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