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Ultrafast dynamic reflectivity of vanadium pentoxide

Published online by Cambridge University Press:  31 January 2011

Gregory J. Taft ,
Matthew T. Newby ,
Joel J. Hrebik ,
Marshall Onellion ,
Thomas F. George ,
Dániel Szentesi ,
Sándor Szatmári  and
László Nánai
Gregory J. Taft
Affiliation:
Department of Physics & Astronomy, University of Wisconsin—Stevens Point, Stevens Point, Wisconsin 54481
Matthew T. Newby
Affiliation:
Department of Physics & Astronomy, University of Wisconsin—Stevens Point, Stevens Point, Wisconsin 54481
Joel J. Hrebik
Affiliation:
Department of Physics & Astronomy, University of Wisconsin—Stevens Point, Stevens Point, Wisconsin 54481
Marshall Onellion
Affiliation:
Department of Physics, University of Wisconsin—Madison, Madison, Wisconsin 53706
Thomas F. George*
Affiliation:
Office of the Chancellor and Center for Nanoscience, Departments of Chemistry & Biochemistry and Physics & Astronomy, University of Missouri—St. Louis, St. Louis, Missouri 63121
Dániel Szentesi
Affiliation:
Department of Experimental Physics, University of Szeged, Dóm tér 9, H-6720 Szeged, Hungary
Sándor Szatmári
Affiliation:
Department of Experimental Physics, University of Szeged, Dóm tér 9, H-6720 Szeged, Hungary
László Nánai
Affiliation:
Department of Experimental Physics, University of Szeged, Dóm tér 9, H-6720 Szeged, Hungary
*
b) Address all correspondence to this author. e-mail: tfgeorge@umsl.edu
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Abstract

The ultrafast dynamic reflectivity of vanadium pentoxide is measured using 40 fs pulses from a self-mode-locked Ti:sapphire laser. The laser pulses excite acoustic vibrations at wave numbers of 145 and 103 cm−1. The amplitudes of the induced oscillations depend strongly on the orientation between the linear polarization of the laser pulses and the crystal axes, with the largest oscillations observed for an orientation of 45°. The higher-frequency oscillation is induced immediately upon arrival of the laser pulse, while the lower-frequency oscillation appears a few picoseconds later. The oscillations persist for approximately 10 ps after the arrival of the pulse. The oscillations are attributed to transverse acoustic modes propagating along the a-axis of the crystal.

Keywords

CrystalLaser
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 2 , February 2008 , pp. 308 - 311
Copyright
Copyright © Materials Research Society 2007

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References

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