Self-diffraction of ultrashort laser pulses under resonant excitation of excitons in a colloidal solution of CdSe/ZnS quantum dots

Journal Article · Thu Oct 31 04:00:00 EDT 2013 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2013V043N10ABEH015257· OSTI ID:22370646

Dneprovskii, V S; Kozlova, M V; Smirnov, A M ^[1]

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1. Department of Physics, M.V. Lomonosov Moscow State University (Russian Federation)

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. (nonlinear optical phenomena)

• OSTI ID: 22370646
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Journal Name: Quantum Electronics (Woodbury, N.Y.) Journal Issue: 10 Vol. 43; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CADMIUM SELENIDES
DIFFRACTION
DIFFRACTION GRATINGS
ELECTRONS
EXCITATION
EXCITONS
HOLES
LASERS
MATHEMATICAL SOLUTIONS
NONLINEAR PROBLEMS
OPACITY
PULSES
QUANTUM DOTS
ZINC SULFIDES