Dynamics of two-photon-induced three-photon absorption in nanosecond, picosecond, and femtosecond regimes
Optics Letters, Vol. 35, Issue 3, pp. 417-419 (2010)
http://dx.doi.org/10.1364/OL.35.000417
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Abstract
Based on five-level rate-equation theory, we develop the laser-pulse-duration dependence of two-photon-absorption-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
OCIS Codes
(190.4180) Nonlinear optics : Multiphoton processes
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.4240) Ultrafast optics : Nanosecond phenomena
(320.5390) Ultrafast optics : Picosecond phenomena
ToC Category:
Nonlinear Optics
History
Original Manuscript: November 9, 2009
Revised Manuscript: January 3, 2010
Manuscript Accepted: January 4, 2010
Published: January 29, 2010
Citation
Bing Gu, Kai Lou, Hui-Tian Wang, and Wei Ji, "Dynamics of two-photon-induced three-photon absorption in nanosecond, picosecond, and femtosecond regimes," Opt. Lett. 35, 417-419 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-3-417
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