Experiment and analysis of two-photon absorption spectroscopy using a white-light continuum probe

    Authors

    R. A. Negres; J. M. Hales; D. J. Hagan;E. W. Van Stryland

    Comments

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    Abbreviated Journal Title

    IEEE J. Quantum Electron.

    Keywords

    nonlinear transmission; nonlinear wave propagation; two-photon; absorption coefficient; two-photon absorption cross section; white-light; continuum; 2-PHOTON ABSORPTION; PUMP-PROBE; TRANSIENT ABSORPTION; PULSES; PHASE; EXCITATION; SOLIDS; Engineering, Electrical & Electronic; Optics; Physics, Applied

    Abstract

    We present an experimental technique along with the method of data analysis to give nondegenerate two-photon absorption (2PA) spectra. We use a femtosecond pump pulse and a white-light continuum (WLC) probe to rapidly generate the 2PA spectra of a variety of materials. In order to analyze data taken with this method, the spectral and temporal characteristics of the WLC must be known, along with the linear dispersion of the sample. This allows determination of the temporal walk-off of the pump and probe pulses as a function of frequency caused by group-velocity mismatch. Data correction can then be performed to obtain the nonlinear losses. We derive an analytical formula for the normalized nonlinear transmittance that is valid under quite general experimental parameters. We verify this on ZnS and use it for the determination of 2PA spectra of some organic compounds in solution. We also compare some of the data on organics with two-photon fluorescence data and find good agreement.

    Journal Title

    Ieee Journal of Quantum Electronics

    Volume

    38

    Issue/Number

    9

    Publication Date

    1-1-2002

    Document Type

    Article

    Language

    English

    First Page

    1205

    Last Page

    1216

    WOS Identifier

    WOS:000177641100009

    ISSN

    0018-9197

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