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Nonlinear Optical Responses of Spin-Coated Vanadium Oxide Films

Published online by Cambridge University Press:  15 March 2011

Masanori Ando ,
Kohei Kadono ,
Kenji Kamada ,
Koji Ohta ,
Jean-François Delouis ,
Keitaro Nakatani  and
Jacques Delaire
Masanori Ando
Affiliation:
Osaka National Research Institute, AIST, MITI, Ikeda, Osaka 563-8577, JAPAN
Kohei Kadono
Affiliation:
Osaka National Research Institute, AIST, MITI, Ikeda, Osaka 563-8577, JAPAN
Kenji Kamada
Affiliation:
Osaka National Research Institute, AIST, MITI, Ikeda, Osaka 563-8577, JAPAN
Koji Ohta
Affiliation:
Osaka National Research Institute, AIST, MITI, Ikeda, Osaka 563-8577, JAPAN
Jean-François Delouis
Affiliation:
PPSM, Ecole Normale Supérieure de Cachan, 94235 Cachan, FRANCE
Keitaro Nakatani
Affiliation:
PPSM, Ecole Normale Supérieure de Cachan, 94235 Cachan, FRANCE
Jacques Delaire
Affiliation:
PPSM, Ecole Normale Supérieure de Cachan, 94235 Cachan, FRANCE
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Abstract

We report on the third-order nonlinear optical responses of V2O5 films prepared by pyrolysis of spin-coated films of vanadium 2-ethylhexanoate. Temporal behavior of third-order optical nonlinearity of the spin-coated V2O5 films was examined at a wavelength of 532 nm by the degenerate four-wave mixing (DFWM) technique using a mode locked Nd/YAG laser (35 ps fwhm). Fast relaxation with a lifetime of 25 ps and slow relaxation with a lifetime of 150 ps were observed. The nonlinear transmission experiment on the spin-coated V2O5 films using the same laser source showed that the transmittance decreased with increasing intensity of the incident light. The intensity-dependent absorption coefficients (β) were roughly estimated to be 3.5×10−5 cm/W. Transient absorption properties of the V2O5 film were measured by use of the second and third harmonics of a Q switched Nd/YAG laser (10 ns fwhm). The results observed for the nonlinear transmission and the transient absorption suggest that induced absorption would contribute to the third-order optical nonlinearity of the V2O5 films with fast response times, and also suggest that the V2O5 films have potentiality for use as optical power limiting materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 637: Symposium E – Microphotonics-Materials, Physics, and Applications , 2000 , E5.19
Copyright
Copyright © Materials Research Society 2001

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References

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