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|Title:||Theoretical and experimental studies of three-photon-induced excited-state absorption||Authors:||Gu, B.
|Issue Date:||2010||Citation:||Gu, B., Ji, W., Yang, H.-Z., Wang, H.-T. (2010). Theoretical and experimental studies of three-photon-induced excited-state absorption. Applied Physics Letters 96 (8) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.3327340||Abstract:||We theoretically and experimentally study excited-state absorption (ESA) induced by three-photon absorption (3PA) under the excitation of ultrafast laser pulses. Based on five-level rate-equation theory, we obtain an analytical expression for the effective four-photon absorption coefficient that originates from both singlet-singlet (S-S) and triplet-triplet (T-T) ESA. We validate that the T-T ESA could be justifiably neglected in the femtosecond regime. Experimentally, we verify it in acetone solution of 2,4,5-trimethoxychalcone by performing femtosecond Z-scan measurements; at low excitation intensity, only 3PA is determined; and under the excitation of high intensity, however, we observe the concurrence of 3PA and 3PA-induced S-S ESA processes. © 2010 American Institute of Physics.||Source Title:||Applied Physics Letters||URI:||http://scholarbank.nus.edu.sg/handle/10635/98333||ISSN:||00036951||DOI:||10.1063/1.3327340|
|Appears in Collections:||Staff Publications|
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