Femtosecond spectroscopy of ferroelectric perovskites: Explanation of anomalous polariton dynamics in lithium tantalate

Gary P. Wiederrecht*, T. P. Dougherty, L. Dhar, K. A. Nelson

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Time resolved impulsive stimulated Raman scattering (ISRS) is used to characterize the lowest frequency A1 phonon-polariton mode in lithium tantalate. The anomalously high and wavevector-dependent damping rates observed are explained in terms of coupling of the polariton to a weakly Raman-active relaxational mode and to two heavily damped vibrational modes. The dynamics of the relaxational mode are explored further through temperature dependent ISRS studies. Femtosecond optical pulse shaping is used for multiple pulse ISRS at temperatures lower than 120 K where single pulse excitation led to photorefractive damage.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium Proceedings
PublisherPubl by Materials Research Society
Pages431-436
Number of pages6
ISBN (Print)1558991883
StatePublished - 1993
Externally publishedYes
EventProceedings of the Second Symposium on Dynamics in Small Confining Systems - Boston, MA, USA
Duration: Nov 30 1992Dec 4 1992

Publication series

NameMaterials Research Society Symposium Proceedings
Volume293
ISSN (Print)0272-9172

Conference

ConferenceProceedings of the Second Symposium on Dynamics in Small Confining Systems
CityBoston, MA, USA
Period11/30/9212/4/92

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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