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Proceedings Paper

Dispersion of third harmonic generation in all-trans ?-carotene
Author(s): J. B. van Beek
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Paper Abstract

The third order nonlinear optical susceptiblity, X(3)zzzz(-3?; ?, ?,?) of all-trans ?- carotene has been measured over three nearly contiguous spectral regions with 6,146 cm-1? ? ? 10,427 cm-1. Maker fringes generated by the third-harmonic signal, either from a thin film or from a thin solution, are analyzed. A strong three -photon resonance is found for the wellknown 1 1Bu <- 1 1Ag band in the blueireen. X(3) is vibronically interpreted within a simple 'essential' states model to produce parameters that successfully account for the very large magnitude of x(3)-1.6x10-10 esu - and its dispersion. A twophoton resonance is found, also in the same blue-green spectral region, with a peak located at 21 ,300 cm-1 and identified with the one n1Ag that is 'essential' to the optical nonlinearity. A 'giant' transition dipole of 31 D is found between this state and the essential' 11Bu state that is nearly degenerate with it. The two-photon cross-section for the 21Ag < -11Ag Thflsition is apparently very weak, for no (two-photon) resonance is seen anywhere in the green to the far red spectral region where the 21Ag is thought to lie.

Paper Details

Date Published: 1 February 1992
Proc. SPIE 1599, Recent Advances in the Uses of Light in Physics, Chemistry, Engineering, and Medicine, (1 February 1992); doi: 10.1117/12.2322307
Show Author Affiliations
J. B. van Beek, Cornell Univ. (United States)

Published in SPIE Proceedings Vol. 1599:
Recent Advances in the Uses of Light in Physics, Chemistry, Engineering, and Medicine

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