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|Title:||Nonlinear optical properties of 2,4,5-Trimethoxy-4′-nitrochalcone: Observation of two-photon-induced excited-state nonlinearities|
|Authors:||Gu, B. |
|Source:||Gu, B., Ji, W., Huang, X.-Q., Patil, P.S., Dharmaprakash, S.M. (2009-01-19). Nonlinear optical properties of 2,4,5-Trimethoxy-4′-nitrochalcone: Observation of two-photon-induced excited-state nonlinearities. Optics Express 17 (2) : 1126-1135. ScholarBank@NUS Repository. https://doi.org/10.1364/OE.17.001126|
|Abstract:||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′- mtrochalcone molecule. © 2008 Optical Society of America.|
|Source Title:||Optics Express|
|Appears in Collections:||Staff Publications|
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