Two-photon photochromism of a photorefractive organic material for holographic recording

Kevind Belfield, Davidj Hagan, Yong Liu, Ralucaa Negres, Meigong Fan, F. E. Hernandez

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


We report the two-photon induced photoisomerization of 3-[1-(1,2-dimethyl-1H-indol-3-yl)-ethylidene]-4-isopropylidene- dihydro-furan-2,5-dione (1), a photochromic compound with λmax = 385 nm, using 775 nm fs pulses. The resulting photoisomer has a λmax = 582 nm. The kinetic rate constant for the isomerization reaction was measured at two different intensities (two different powers), showing a quadratic dependence with respect to the pump intensity. Results of pump-probe solution phase experiments and guest/host polymer thin film interferometric imaging studies are shown. A two-photon absorption molecular cross-section σ2 = 10.3×10-48 cm4·s/photon was measured using Z-scan, supporting a two-photon induced isomerization process.

Original languageEnglish (US)
Pages (from-to)15-22
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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