Title

Experiment And Analysis Of Two-Photon Absorption Spectroscopy Using A White-Light Continuum Probe

Keywords

Nonlinear transmission; Nonlinear wave propagation; Two-photon absorption coefficient; Two-photon absorption cross section; White-light continuum

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.

Publication Date

9-1-2002

Publication Title

IEEE Journal of Quantum Electronics

Volume

38

Issue

9

Number of Pages

1205-1216

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/JQE.2002.802448

Socpus ID

0036714907 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0036714907

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