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Title: Dynamics of two-photon-induced three-photon absorption in nanosecond, picosecond, and femtosecond regimes
Authors: Gu, B.
Lou, K.
Wang, H.-T.
Ji, W. 
Issue Date: 1-Feb-2010
Citation: Gu, B., Lou, K., Wang, H.-T., Ji, W. (2010-02-01). Dynamics of two-photon-induced three-photon absorption in nanosecond, picosecond, and femtosecond regimes. Optics Letters 35 (3) : 417-419. ScholarBank@NUS Repository.
Abstract: Based on five-level rate-equation theory, we develop the laser-pulse-duration dependence of two-photonabsorption-induced singlet and triplet excited-state absorptions (ESAs We present analytical expressions for the effective three-photon absorption coefficients caused by both singlet and triplet ESAs under the pulsed excitation on time scales from femtoseconds to microseconds. We demonstrate that the triplet ESA is predominant with longer laser pulses (microseconds to tens of nanoseconds) and that the resultant nonlinear absorption (NLA) can be adequately interpreted by a simplified four-level model. Under the excitation of picosecond laser pulses, generally speaking, the competition between singlet and triplet ESAs is observable. In this instance, the photodynamics of the system can be understood by a five-level model. In the femtosecond regime, however, a three-level model is validated in the prediction of NLA, because the triplet ESA becomes negligible © 2010 Optical Society of America.
Source Title: Optics Letters
ISSN: 01469592
DOI: 10.1364/OL.35.000417
Appears in Collections:Staff Publications

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