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This article is cited in 19 scientific papers (total in 19 papers)
Nonlinear optical phenomena
Self-diffraction of ultrashort laser pulses under resonant excitation of excitons in a colloidal solution of CdSe/ZnS quantum dots
V. S. Dneprovskii, M. V. Kozlova, A. M. Smirnov Lomonosov Moscow State University, Faculty of Physics
Abstract:
We report self-diffraction processes of two types under resonant excitation of the fundamental electron – hole (exciton) transition in a strongly absorbing colloidal solution of CdSe/ZnS quantum dots (QDs) by high-power picosecond laser pulses. In the first case the absorption saturation (bleaching) at the exciton transition frequency and the Stark shift of exciton absorption line lead to the formation of a transparency channel and self-diffraction of the laser beam from the thus induced round diaphragm. In the second case, self-diffraction of two laser beams, intersecting in a cell with a colloidal QD solution, occurs on the diffraction grating induced by these beams. The physical processes responsible for the nonlinear optical properties of CdSe/ZnS QDs and the found selfaction effects are analysed.
Keywords:
semiconductor quantum dots, self-diffraction, exciton, induced diffraction grating, absorption saturation, Stark effect.
Received: 13.06.2013
Citation:
V. S. Dneprovskii, M. V. Kozlova, A. M. Smirnov, “Self-diffraction of ultrashort laser pulses under resonant excitation of excitons in a colloidal solution of CdSe/ZnS quantum dots”, Kvantovaya Elektronika, 43:10 (2013), 927–930 [Quantum Electron., 43:10 (2013), 927–930]
Linking options:
https://www.mathnet.ru/eng/qe15257 https://www.mathnet.ru/eng/qe/v43/i10/p927
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