The extremely early stage of the ferroelectric B 2 soft mode of KDP studied by the impulsive stimulated Raman scattering

Jun Kano, Yuhji Tsujimi, Keith A. Nelson, Toshirou Yagi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

It has been reported that the ferroelectric B 2 soft mode of KDP in time-domain was observed directly by the impulsive stimulated Raman scattering with a heterodyne detection method (HD-ISRS). With 80 femtosecond laser pulses, the initial process in the extremely early stage of the B 2 mode excitation observed for the first time in time-domain. The signals are analyzed using the modified Debye model (MDM) which gives phenomenologically the initial process of the Debye model. MDM produces a poor fit to the initial process of the B 2 mode in contrast to the good fit to its relaxation process. This indicates that a new model to describe a whole time dependence of the B 2 mode is needed.

Original languageEnglish
Pages (from-to)59-66
Number of pages8
JournalFerroelectrics
Volume285
DOIs
Publication statusPublished - Jun 1 2003
Externally publishedYes

Keywords

  • Debye model
  • Heterodyne detection
  • Impulsive stimulated Raman scattering
  • Initial process
  • KDP
  • Phase transition
  • Soft mode

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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