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Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 3, Iss. 4 — Apr. 23, 2008

Analytical expression for femtosecond-pulsed z scans on instantaneous nonlinearity

Bing Gu, Wei Ji, and Xiao-Qin Huang  »View Author Affiliations

Applied Optics, Vol. 47, Issue 9, pp. 1187-1192 (2008)

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By employing the Gaussian decomposition method, the analytical formulas of the Gaussian-beam Z-scan traces have been derived for an optically thin material exhibiting both refractive and absorptive parts of third-order nonlinearity, with Gaussian or hyperbolic secant squared laser pulses of femtosecond duration. The formulas have been verified experimentally with femtosecond-pulsed Z scans on a carbon disulfide and acetone solution of a chalcone derivative ( 0.95 C 18 H 17 ClO 4 · 0.05 C 17 H 14 Cl 2 O 3 ). An efficient yet accurate analytical technique has been demonstrated for extracting both the nonlinear refraction coefficient and the nonlinear absorption coefficient from a single closed-aperture Z-scan trace.

© 2008 Optical Society of America

OCIS Codes
(190.4420) Nonlinear optics : Nonlinear optics, transverse effects in
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials
(320.7100) Ultrafast optics : Ultrafast measurements

ToC Category:
Nonlinear Optics

Original Manuscript: November 14, 2007
Revised Manuscript: January 20, 2008
Manuscript Accepted: January 20, 2008
Published: March 14, 2008

Virtual Issues
Vol. 3, Iss. 4 Virtual Journal for Biomedical Optics

Bing Gu, Wei Ji, and Xiao-Qin Huang, "Analytical expression for femtosecond-pulsed Z scans on instantaneous nonlinearity," Appl. Opt. 47, 1187-1192 (2008)

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