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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 2 — Jan. 19, 2009
  • pp: 1126–1135

Nonlinear optical properties of 2,4,5-Trimethoxy-4′-nitrochalcone: observation of two-photon-induced excited-state nonlinearities

Bing Gu, Wei Ji, Xiao-Qin Huang, P. S. Patil, and S.M. Dharmaprakash  »View Author Affiliations

Optics Express, Vol. 17, Issue 2, pp. 1126-1135 (2009)

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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.

© 2009 Optical Society of America

OCIS Codes
(190.3270) Nonlinear optics : Kerr effect
(190.4180) Nonlinear optics : Multiphoton processes
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials

ToC Category:
Nonlinear Optics

Original Manuscript: November 30, 2008
Revised Manuscript: December 23, 2008
Manuscript Accepted: December 28, 2008
Published: January 15, 2009

Bing Gu, Wei Ji, Xiao-Qin Huang, P. S. Patil, and S. M. Dharmaprakash, "Nonlinear optical properties of 2,4,5-Trimethoxy-4ʹ-nitrochalcone: observation of two-photon-induced excited-state nonlinearities," Opt. Express 17, 1126-1135 (2009)

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