Please use this identifier to cite or link to this item: https://doi.org/10.1364/OE.16.017745
Title: Two-photon-induced excited-state nonlinearities
Authors: Gu, B. 
Sun, Y.
Ji, W. 
Issue Date: 27-Oct-2008
Citation: Gu, B., Sun, Y., Ji, W. (2008-10-27). Two-photon-induced excited-state nonlinearities. Optics Express 16 (22) : 17745-17751. ScholarBank@NUS Repository. https://doi.org/10.1364/OE.16.017745
Abstract: We report a theoretical investigation of laser-pulse-duration dependence of excited-state nonlinearities induced by two-photon absorption (2PA). We investigate the spatiotemporal characteristics of the transmitted pulses caused by 2PA-induced excited-state absorption, which strongly depends on laser pulse duration. By taking into account 2PA cross-section, excited-state photophysical properties, as well as laser pulse duration, we quantitatively determine the effective fifth-order nonlinearities caused by excited-state absorption and refraction. The results are capable of predicting the magnitude of 2PA-induced excited-state nonlinearities on the time scales where laser pulse duration is less than or comparable to the lifetime of 2PA-induccd excited states. We also develop Z-scan theories for quickly yet unambiguously estimation of 2PA coefficient, third-order nonlinear refraction index, and excited-state absorption and refraction cross-sections. © 2008 Optical Society of America.
Source Title: Optics Express
URI: http://scholarbank.nus.edu.sg/handle/10635/98488
ISSN: 10944087
DOI: 10.1364/OE.16.017745
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