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Optics Letters

Optics Letters

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  • Vol. 27, Iss. 10 — May. 15, 2002
  • pp: 845–847

Nonlinear refraction spectroscopy in resonance with laser lines in solids

S. M. Lima, H. Jiao, *L. A. O. Nunes, and T. Catunda  »View Author Affiliations


Optics Letters, Vol. 27, Issue 10, pp. 845-847 (2002)
http://dx.doi.org/10.1364/OL.27.000845


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Abstract

We report a simple extension of the Z-scan technique that permits a spectral line-shape measurement of the real and the imaginary parts of n2 . In this technique the sample is placed at the peak position of the usual Z-scan curve while the laser frequency is scanned. We employed this method to investigate the nonlinear susceptibility of the R lines of ruby and alexandrite, using a cw dye laser. This susceptibility can be explained by the resonant interaction and by a nonresonant contribution that is due to the difference in polarizability between Cr3+ excited and ground states. For ruby, the nonresonant contribution to the technique is 1 order of magnitude larger than the resonant contribution. However, for alexandrite both contributions are comparable, and their interference leads to a shift between n2 and n2′′ spectra that is not observed in ruby.

© 2002 Optical Society of America

OCIS Codes
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.4720) Nonlinear optics : Optical nonlinearities of condensed matter
(300.6250) Spectroscopy : Spectroscopy, condensed matter
(300.6420) Spectroscopy : Spectroscopy, nonlinear

Citation
S. M. Lima, H. Jiao, *L. A. O. Nunes, and T. Catunda, "Nonlinear refraction spectroscopy in resonance with laser lines in solids," Opt. Lett. 27, 845-847 (2002)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-27-10-845

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