We present experimental data for the irradiance dependence of the optical nonlinearity of a suspension of vanadyl-phthalocyanine nano-crystals in cyclohexane at different wavelengths across resonance. The refractive and absorptive contributions to the nonlinearity were resolved using the z-scan technique with a tunable picosecond laser source. A three-level model is used to describe the observed dependence of the nonlinearity with irradiance, which is considered as arising solely from excited-state absorption. A fit to the experimental data is made, allowing the extraction of molecular parameters which are of interest for a full characterisation of the nonlinearity.
|Number of pages||6|
|Journal||Molecular Crystals and Liquid Crystals Science and Technology Section B: Nonlinear Optics|
|Publication status||Published - 2000|
- Excited-state absorption
ASJC Scopus subject areas
- Control and Systems Engineering
- Condensed Matter Physics