Issues concerning the investigation of hyperpolarizability tensor of organic molecules by depolarized hyper-Rayleigh scattering

K. Y. Wong; S. W. Wong

doi:10.1117/12.256165

1 November 1996 Issues concerning the investigation of hyperpolarizability tensor of organic molecules by depolarized hyper-Rayleigh scattering

K. Y. Wong, S. W. Wong

Author Affiliations +

Proceedings Volume 2852, Nonlinear Optical Properties of Organic Materials IX; (1996) https://doi.org/10.1117/12.256165
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

We address two experimental issues concerning the measurement of depolarized Hyper-Rayleigh scattering (HRS). The first issue concerns with the possibility of two-photon induced fluorescence (TPF). We observed that the depolarization of TPF from crystal violet, which is an octupolar molecule with a very short fluorescence lifetime, is identical to that expected theoretically for HRS. This makes distinguishing the two processes difficult. The second issue concerns with the way second harmonic light is collected in a HRS measurement. We developed a simple procedure to ensure the depolarization ratio measured would correspond to the ideal 90 degree(s) scattering from a point source. We measure the depolarized HRS of p-nitroaniline (PNA) using this improved technique. The result indicates that the hyperpolarizability tensor of PNA has essentially the characteristics of a rod-like structure, with a single nonvanishing diagonal component (beta) ₃₃₃, where the 3- axis corresponds to the polar direction. This is in contrast with previous-theoretical calculations, which predicted non- negligible values for some of the off-diagonal components. A plausible explanation of the experimental result is suggested based on a model of the local field correction factors.

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K. Y. Wong and S. W. Wong "Issues concerning the investigation of hyperpolarizability tensor of organic molecules by depolarized hyper-Rayleigh scattering", Proc. SPIE 2852, Nonlinear Optical Properties of Organic Materials IX, (1 November 1996); https://doi.org/10.1117/12.256165

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