Propagation of femtosecond white-light continuum pulse in polymer latex powder investigated by optical kerr gate and time-resolved diffuse reflectance spectroscopy

Akihiro Furube*, Tsuyoshi Asahi, Hiroshi Masuhara

*Corresponding author for this work

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Propagation of a femtosecond while-light continuum pulse (350 fs) in poly (methyl methacrylate) (PMMA) latex powders with particle diameters of 1, 5, 20, 60, and 100 μm was investigated by means of an optical Kerr gate and time-resolved diffuse reflectance spectroscopy, which is a pump-probe technique for multiple light scattering materials. The temporal profile of a diffuse reflected light pulse from the powder and the temporal response of transient absorption of the powder doped with an organic molecule were measured. The Kubelka-Munk model was extended to address the propagation of a short light pulse, and its numerical simulations reproduced both experimental results quite well. It is suggested that in a dense scattering medium such as powder, an effect that light is confined or proceeds in a twisted manner is of importance. Fitting the experimental data with the diffusion theory was unsuccessful, which is also discussed.

Original languageEnglish
Pages (from-to)4236-4243
Number of pages8
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume38
Issue number7 B
DOIs
StatePublished - 15 Jul 1999

Keywords

  • Diffuse reflectance spectroscopy
  • Kubelka-Munk theory
  • Light propagation
  • Optical kerr gate
  • PMMA latex powder
  • Pump-probe technique
  • Transient absorption

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