Irradiance dependence of the resonant nonlinearities in an organic material

R. Rangel-Rojo, H. Matsuda, H. Kasai, H. Nakanishi

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


We present experimental data for the irradiance dependence of the optical nonlinearity of an organic material at different wavelengths across resonance. The material studied was a suspension of vanadyl-phthalocyanine nanocrystals in cyclohexane. The refractive and absorptive contributions to the nonlinearity were resolved by use of the z-scan technique with a tunable picosecond laser source. The observed dependence of the nonlinearity with irradiance is explained by excited-state absorption, and a three-level model is used to describe the nonlinear response. A fit to the experimental data is made, allowing the extraction of molecular parameters that are of interest for a full characterization of the nonlinearity.

Original languageEnglish
Pages (from-to)1376-1382
Number of pages7
JournalJournal of the Optical Society of America B: Optical Physics
Issue number8
Publication statusPublished - 2000 Aug
Externally publishedYes

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Irradiance dependence of the resonant nonlinearities in an organic material'. Together they form a unique fingerprint.

Cite this