Abstract
We have studied the nonlinear refractive properties of the organometalic fullerene-C 60 derivatives fac- and mer- [bis (1,2-diphenylphosphino) ethane] (tricarbonyl)(η 2-fullerene-C 60) chromium and molybdenum using the Z-scan method. These compounds change from being self-defocusing to self-focusing as the input light intensity increases. The experimental results have been interpreted using rate-equation theory. Critical conditions for the occurrence of this kind of transition have been elucidated for the steady-state situation.
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