Journal
OPTICS EXPRESS
Volume 17, Issue 2, Pages 1126-1135Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.17.001126
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Funding
- National Science Foundation of China [10704042]
- National University of Singapore [R-144-000-213-112]
- Natural Science Foundation of Jiangsu Higher Education Institutions of China [06KJB140057]
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We report experimental investigations of optical nonlinearities and nonlinear dynamics in acetone solution of 2,4,5-Trimethoxy-4'-nitrochalcone. By performing Z-scans with femtosecond laser pulses at low excitation intensity, two-photon absorption (2PA) and third-order nonlinear refraction are measured. As laser excitation intensity exceeds a critical value, however, the interplay between third- and fifth-order nonlinearities is observed. It is also confirmed that fifth-order processes mainly originate from 2PA-induced excited-state nonlinearities by conducting femtosecond time-resolved degenerate pump-probe measurements. All the nonlinear parameters are determined unambiguously in the near infrared region of the 2PA cross-section, second-order hyperpolarizability, excited-state absorption cross-section, excited-state refraction cross-section, lifetime of excited states induced by 2PA, and critical population of the excited states in 2,4,5-Trimethoxy-4'-nitrochalcone molecule. (C) 2008 Optical Society of America
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