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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 26 — Dec. 20, 2010
  • pp: 26843–26853

Excited-state enhancement of third-order optical nonlinearities: photodynamics and characterization

Bing Gu, Kai Lou, Jing Chen, Yongnan Li, Hui-Tian Wang, and Wei Ji  »View Author Affiliations


Optics Express, Vol. 18, Issue 26, pp. 26843-26853 (2010)
http://dx.doi.org/10.1364/OE.18.026843


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Abstract

Based on the simplified five-level rate-equation theory, we investigate the hybrid third-order optical nonlinear processes which combine the instantaneous nonlinearity and the one-photon absorption induced excited-state nonlinearity. We obtain the analytical third-order nonlinear absorption and refraction coefficients originating from the singlet and triplet excited-state effects. We explore the photodynamic process and give the corresponding level diagram in the nanosecond, picosecond, and femtosecond regimes. We develop the pulse-duration-dependent Z-scan theory for characterizing the simultaneous instantaneous nonlinearity and cumulative effect of the excited-state nonlinearity. We also demonstrate the validity of the presented theory to analyze the experimental results.

© 2010 Optical Society of America

OCIS Codes
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials
(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: September 24, 2010
Revised Manuscript: November 4, 2010
Manuscript Accepted: November 17, 2010
Published: December 7, 2010

Citation
Bing Gu, Kai Lou, Jing Chen, Yongnan Li, Hui-Tian Wang, and Wei Ji, "Excited-state enhancement of third-order optical nonlinearities: photodynamics and characterization," Opt. Express 18, 26843-26853 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-26-26843


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