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Optics Letters

Optics Letters


  • Vol. 36, Iss. 8 — Apr. 15, 2011
  • pp: 1401–1403

Baryscan: a sensitive and user-friendly alternative to Z scan for weak nonlinearities measurements

Thomas Godin, Michael Fromager, Emmanuel Cagniot, Richard Moncorgé, and Kamel Aït-Ameur  »View Author Affiliations

Optics Letters, Vol. 36, Issue 8, pp. 1401-1403 (2011)

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A new and efficient technique for measuring weak optical nonlinearities is reported. Like Z scan, its implementation is basic, both experimentally and theoretically, but leads to an improved sensitivity of λ / 5.10 4 , which represents, to date, one of the highest observed enhancements. With this technique, which is based upon the use of a position sensitive detector, nonlinear properties are deduced by monitoring the barycentric position of a truncated pump–probe laser beam as the sample is moved along the optical axis. The technique is experimentally validated by measuring the pump-induced refractive index change and the underlying polarizability variation resulting from the excitation of the Cr 3 + ions in ruby.

© 2011 Optical Society of America

OCIS Codes
(050.5080) Diffraction and gratings : Phase shift
(160.4330) Materials : Nonlinear optical materials
(190.4420) Nonlinear optics : Nonlinear optics, transverse effects in
(260.5950) Physical optics : Self-focusing

ToC Category:

Original Manuscript: February 22, 2011
Revised Manuscript: March 21, 2011
Manuscript Accepted: March 22, 2011
Published: April 13, 2011

Thomas Godin, Michael Fromager, Emmanuel Cagniot, Richard Moncorgé, and Kamel Aït-Ameur, "Baryscan: a sensitive and user-friendly alternative to Z scan for weak nonlinearities measurements," Opt. Lett. 36, 1401-1403 (2011)

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