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Time-Resolved Picosecond Reflectivity Study of Laser-Excited Layered Compounds

Published online by Cambridge University Press:  28 February 2011

C. Y. Huang ,
A. M. Malvezzi ,
N. Bloembergen  and
F.J. Di Salvo Jr.
C. Y. Huang
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico USA
A. M. Malvezzi
Affiliation:
Division of Applied Sciences, Harvard University, Cambridge, MA 02138, USA
N. Bloembergen
Affiliation:
Division of Applied Sciences, Harvard University, Cambridge, MA 02138, USA
F.J. Di Salvo Jr.
Affiliation:
AT&T Bell Laboratories, Murray Hill, N.J. 07974, USA
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Abstract

We have employed the pump-and-probe technique to perform picosecond time resolved measurements of the reflectivity changes in two archetypal layered compounds, IT-TiS2 and lT-TiSe2 probed at 1.064 μm after pumping by 20 ps, .532 μm laser pulses. At the threshold fluence, ∼ 40 mJ/cm2, the reflectivity drops sharply, marking the occurrence of a phase transformation on the surface of the sample. Above threshold, the reflectivity reaches a value as low as ∼0.1 at high fluences, strongly suggesting that, like in graphite, the high temperature phase is not metallic.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 74: Symposium A – Beam-Solid Interactions and Transient Processes , 1986 , 269
Copyright
Copyright © Materials Research Society 1987

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References

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