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Opt Lett. 2009 Dec 1;34(23):3644-6. doi: 10.1364/OL.34.003644.

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

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1
1Department of Physics, National Institute of Technology, Durgapur 713209, India.

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.

PMID:
19953148
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