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Title: Two-step four-photon absorption
Authors: Gu, B. 
Ji, W. 
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.
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
ISSN: 10944087
DOI: 10.1364/OE.16.010208
Appears in Collections:Staff Publications

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