Dispersion of third harmonic generation in all-trans ?-carotene

J. B. van Beek

doi:10.1117/12.2322307

1 February 1992 Dispersion of third harmonic generation in all-trans β-carotene

J. B. van Beek

Proceedings Volume 1599, Recent Advances in the Uses of Light in Physics, Chemistry, Engineering, and Medicine; (1992) https://doi.org/10.1117/12.2322307
Event: Recent Advances in the Uses of Light in Physics, Chemistry, Engineering, and Medicine, 1991, New York, NY, United States

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.

Citation Download Citation

J. B. van Beek "Dispersion of third harmonic generation in all-trans β-carotene", Proc. SPIE 1599, Recent Advances in the Uses of Light in Physics, Chemistry, Engineering, and Medicine, (1 February 1992); https://doi.org/10.1117/12.2322307

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