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|Title:||Two-step four-photon absorption||Authors:||Gu, B.
|Issue Date:||7-Jul-2008||Citation:||Gu, B., Ji, W. (2008-07-07). Two-step four-photon absorption. Optics Express 16 (14) : 10208-10213. ScholarBank@NUS Repository. https://doi.org/10.1364/OE.16.010208||Abstract:||We report a theoretical investigation of effective four-photon absorption (4PA) process and propose a two-step 4PA model of threephoton-induced excited-state absorption (ESA). Based on three-level rate-equation theory, we find an analytical result for the effective 4PA coefficient that depends on the three-photon absorption (3PA) cross-section, excited-state photophysical properties, and laser pulse duration. We present the analytical theory of the z-dependent nonlinear transmission for straightforwardly yet unambiguously evaluating the 3PA and effective 4PA coefficients simultaneously. © 2008 Optical Society of America.||Source Title:||Optics Express||URI:||http://scholarbank.nus.edu.sg/handle/10635/98491||ISSN:||10944087||DOI:||10.1364/OE.16.010208|
|Appears in Collections:||Staff Publications|
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