Third-order nonlinear spectra in C60 and C70: reconciling electroabsorption, third-harmonic generation and degenerate four-wave mixing spectra

Bret C. Hess; Don V. Bowersox; Shant H. Mardirosian; Lawrence D. Unterberger

doi:10.1117/12.262995

16 December 1996 Third-order nonlinear spectra in C₆₀ and C₇₀: reconciling electroabsorption, third-harmonic generation and degenerate four-wave mixing spectra

Bret C. Hess, Don V. Bowersox, Shant H. Mardirosian, Lawrence D. Unterberger

Author Affiliations +

Proceedings Volume 2854, Fullerenes and Photonics III; (1996) https://doi.org/10.1117/12.262995
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

We present an overview of what has been learned form nonlinear optical spectral studies in C₆₀ and C₇₀ by our group and others. These include third harmonic generation (THG), degenerate four-wave mixing (DFWM), and electroabsorption (EA). We present empirical models of interacting states consistent with spectra of EA, THG, and DFWM in C₆₀ and C₇₀. The spectra in the dispersed and solid forms differ significantly. In C₆₀ the lowest- energy resonances in (chi) ^(3_ are dominated by 'forbidden' transitions made allowed by vibronic coupling in the molecule and intermolecular coupling in the solid. These interactions must be included in theoretical models of C₆₀ if comparison is to be made between calculated and experimental nonlinear optical spectra. Major features of (chi) ⁽³) spectra in C₇₀ can be modeled with similar states redshifted from those of C₆₀.

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Bret C. Hess, Don V. Bowersox, Shant H. Mardirosian, and Lawrence D. Unterberger "Third-order nonlinear spectra in C₆₀ and C₇₀: reconciling electroabsorption, third-harmonic generation and degenerate four-wave mixing spectra", Proc. SPIE 2854, Fullerenes and Photonics III, (16 December 1996); https://doi.org/10.1117/12.262995

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