Abstract

We present a technique for rapid characterization of degenerate nonlinear absorption and refraction spectra using a femtosecond white-light continuum (WLC) pulse to perform Z-scans. The spectral components of the WLC source are temporally and spatially dispersed to minimize nondegenerate two-photon absorption (2PA) processes. We demonstrate the validity of the method by measuring the 2PA spectrum of a well-characterized semiconductor, ZnSe.

© 2004 Optical Society of America

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References

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Abstr. Papers Amer. Chem. Soc. (1)

K.D. Belfield, X.Ren, D.J.Hagan, E.W. Van Stryland, V.Dubikovsky and E.J.Miesak, ???Microfabrication via two-photon photoinitiated polymerization,??? Abstr. Papers Amer. Chem. Soc. 218, (2001).

Annual Review of Biomedical Engineering (1)

P.T.C So, C.Y.Dong, B.R.Masters and K.M.Berland, ???Two-photon excitation fluorescence microscopy,??? Annual Review of Biomedical Engineering 2, 399 (2000).
[CrossRef]

Appl. Spectrosc. (1)

CLEO Conference (1)

M.Balu, J.Hales, D.J.Hagan and E.W.Van Stryland, ???White-light continuum z-scan technique for nonlinear material characterization,??? CLEO Conference, San Francisco, May 16-21, 2004.

IEEE J.Quantum Electron. (2)

M.Sheik-Bahae, A.A.Said, T.H.Wei, D.J.Hagan and E.W. Van Stryland, ???Sensitive measurement of optical nonlinearities using a single beam,??? IEEE J.Quantum Electron. 26, 760 (1990).
[CrossRef]

R. Negres, J. Hales, A. Kobyakov, D. J. Hagan and E. W. Van Stryland, ???Experiment and analysis of two-photon absorption spectroscopy using a white-light continuum probe,??? IEEE J.Quantum Electron. 38, 1205 (2002).
[CrossRef]

J. Opt. Soc. Am. B (1)

Opt. Commun. (1)

A. Brodeur, F.A. Ilkov, S.L. Chin, ???Beam filamentation and the white light continuum divergence,??? Opt. Commun. 129, 193 (1996).
[CrossRef]

Opt. Express (2)

Opt. Lett. (2)

Prog. Quamtum Electron (1)

L.W.Tutt and T.F.Boggess, ???A review of optical limiting mechanisms and devices using organics, fullerenes, semiconductors and other materials, ??? Prog. Quamtum Electron 17, 299 (1993).
[CrossRef]

Other (1)

H.M Gibbs, Optical Bistability: Controlling Light with Light (Academic Press, London, 1985).

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Figures (6)

Fig. 1.
Fig. 1.

WLC Z-scan experimental setup. CPA-2001-femtosecond source; WP-waveplate; P-polarizer; L-lens; GP-glass prism; M-mirror; NBF-narrow band filter; BS-beamsplitter; S-sample; D1, D2-detectors. A and B denote the positions of additional elements inserted in the set-up. NBF(SW) is used only in the single wavelength configuration discussed in the text with the other two NBF’s removed.

Fig. 2.
Fig. 2.

Normalized Z-scan transmittances of ZnSe measured at 650nm for a) the WLC configuration and b) the SW configuration. The solid lines represent fittings used to extract β values.

Fig. 3.
Fig. 3.

Normalized Z-scan transmittance of ZnSe measured at 670nm with the WLC beam temporally dispersed. The solid lines represent fittings used to extract β values a) WLC configuration, b) SW configuration.

Fig. 4.
Fig. 4.

Normalized Z-scan transmittance of ZnSe measured at 670nm with the WLC beam temporally and spatially dispersed. The solid lines represent fittings used to extract β values a) WLC configuration, b) SW configuration.

Fig. 5.
Fig. 5.

Normalized Z-scan transmittance of ZnSe measured at different wavelengths with the WLC beam temporally and spatially dispersed. The solid lines represent fittings used to extract β values. Z-scan traces are shifted from their original positions for an easier view.

Fig. 6.
Fig. 6.

2PA coefficient, β, values obtained from theory and from the experimental data fittings.

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