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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 27, Iss. 4 — Feb. 15, 2002
  • pp: 270–272

Two-photon spectroscopy and analysis with a white-light continuum probe

Raluca A. Negres, Joel M. Hales, Andrey Kobyakov, David J. Hagan, and Eric W. Van Stryland  »View Author Affiliations


Optics Letters, Vol. 27, Issue 4, pp. 270-272 (2002)
http://dx.doi.org/10.1364/OL.27.000270


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Abstract

We present a powerful experimental tool and analysis for characterization of two-photon absorption (2PA) spectra. We demonstrate this method with ZnS and then apply it to organic dyes in solution. We also compare the results with those from other methods such as two-photon fluorescence spectroscopy. This femtosecond pump—probe method uses a white-light continuum (WLC) as the probe to produce a nondegenerate 2PA spectrum. The extreme chirp of the WLC requires that transmittance data be collected over a range of temporal delays between pump and probe pulses. These data then need to be corrected for the effects of this chirp as well as for the temporal walk-off of the pulses in the sample that result from the frequency nondegenerate nature of the experiment. We present a simple analytic solution for the transmitted fluence through the sample, which is applicable for most practical cases.

© 2002 Optical Society of America

OCIS Codes
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials
(320.7150) Ultrafast optics : Ultrafast spectroscopy

Citation
Raluca A. Negres, Joel M. Hales, Andrey Kobyakov, David J. Hagan, and Eric W. Van Stryland, "Two-photon spectroscopy and analysis with a white-light continuum probe," Opt. Lett. 27, 270-272 (2002)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-27-4-270

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