Determination of two-photon extinction coefficients of organic molecules

Peter C.E. Tackx; Martti Kauranen; Andre P. Persoons

doi:10.1117/12.187515

23 September 1994 Determination of two-photon extinction coefficients of organic molecules

Peter C.E. Tackx, Martti Kauranen, Andre P. Persoons

Author Affiliations +

Proceedings Volume 2285, Nonlinear Optical Properties of Organic Materials VII; (1994) https://doi.org/10.1117/12.187515
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

A phase-conjugate interferometer, based on degenerate four-wave mixing in the retroreflected pump beam configuration, is used to determine the complex third-order hyperpolarizability of organic molecules in solution. The imaginary part of this third-order hyperpolarizability yields a value for the two-photon extinction coefficient of the molecule. This is an absolute value with respect to the reference material and does not depend on the laser intensity used. We show that the observed attenuation in the phase-conjugate signal is not necessarily due to two- photon absorption. In several cases more complex loss mechanisms are responsible for the absorption of the signal.

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Peter C.E. Tackx, Martti Kauranen, and Andre P. Persoons "Determination of two-photon extinction coefficients of organic molecules", Proc. SPIE 2285, Nonlinear Optical Properties of Organic Materials VII, (23 September 1994); https://doi.org/10.1117/12.187515

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