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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 34, Iss. 23 — Dec. 1, 2009
  • pp: 3644–3646

Three-photon-induced four-photon absorption and nonlinear refraction in ZnO quantum dots

M. Chattopadhyay, P. Kumbhakar, C. S. Tiwary, A. K. Mitra, U. Chatterjee, and T. Kobayashi  »View Author Affiliations


Optics Letters, Vol. 34, Issue 23, pp. 3644-3646 (2009)
http://dx.doi.org/10.1364/OL.34.003644


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Abstract

Three-photon-induced four-photon absorption via excited-state absorption and self-defocusing nonlinear refraction are reported for the first time, to our knowledge, in ZnO quantum dots with average sizes of 2.0 ± 0.1   nm with 1064 nm radiation from a Q-switched Nd:YAG laser at a peak intensity of 2.5   GW / cm 2 . By employing the three-level two-step model, the experimental results can be explained quite satisfactorily.

© 2009 Optical Society of America

OCIS Codes
(190.0190) Nonlinear optics : Nonlinear optics
(190.4180) Nonlinear optics : Multiphoton processes
(350.4238) Other areas of optics : Nanophotonics and photonic crystals

ToC Category:
Nonlinear Optics

History
Original Manuscript: August 3, 2009
Revised Manuscript: October 17, 2009
Manuscript Accepted: October 20, 2009
Published: November 20, 2009

Citation
M. Chattopadhyay, P. Kumbhakar, C. S. Tiwary, A. K. Mitra, U. Chatterjee, and T. Kobayashi, "Three-photon-induced four-photon absorption and nonlinear refraction in ZnO quantum dots," Opt. Lett. 34, 3644-3646 (2009)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-34-23-3644


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