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    Broadband Z-scan characterization using a high spectral irradiance high quality supercontinuum

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    Date
    2008-02
    Author
    Balu, Mihaela
    Padilha, Lazaro A.
    Hagan, David J.
    Van Stryland, Eric W.
    Yao, Sheng
    Belfield, Kevin D.
    Zheng, Shijun
    Barlow, Stephen
    Marder, Seth R.
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    Abstract
    We generate a high-spectral-irradiance, high-quality continuum by weakly focusing femtosecond pulses in Kr gas. We use this continuum as a source for rapid Z-scan measurements of the degenerate nonlinear absorption spectrum and the associated dispersion of the nonlinear refraction in optical materials throughout the visible. We measure the degenerate two-photon absorption spectra and the dispersion of the nonlinear refractive index, n 2 , of two well-characterized semiconductors (ZnSe and ZnS ) as reference samples for our method, along with dilute solutions of organic materials. The latter materials demonstrate application of the technique to samples with lower nonlinearities.
    URI
    http://hdl.handle.net/1853/45506
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