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Femtosecond Spectroscopy of Ferroelectric Perovskites: Explanation of Anomalous Polariton Dynamics in Lithium Tantalate

Published online by Cambridge University Press:  25 February 2011

Gary P. Wiederrecht ,
T. P. Dougherty ,
L. Dhar  and
K. A. Nelson
Gary P. Wiederrecht
Affiliation:
Argonne National Laboratories, Artificial Photosynthesis Division, Argonne, IL 60439
T. P. Dougherty
Affiliation:
NIST, Molecular Physics Division. Bldg 221, rm B268 Gaithersburg, MD 20899
L. Dhar
Affiliation:
Dept. of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139
K. A. Nelson
Affiliation:
Dept. of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139
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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 120K where single pulse excitation led to photorefractive damage.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 293: Symposium U – Solid State Ionics III , 1992 , 431
Copyright
Copyright © Materials Research Society 1993

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