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Saint Petersburg, Russia

Petrashen A.G.,Institute of Fine Mechanics and Optics
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2010

The possibility of cancelling the signal of linear polarization upon coherent excitation of 4s 3S1 atoms via a Λ scheme from 3p 3P1 and 3p 3P2 levels is demonstrated using an ensemble of sulphur atoms as an example. © Pleiades Publishing, Ltd., 2010.


Danilov V.V.,S. I. Vavilov State Optical Institute | Baranov A.V.,Institute of Fine Mechanics and Optics | El'yashevich G.K.,RAS Institute of Macromolecular Compounds | Orlova A.O.,Institute of Fine Mechanics and Optics | And 2 more authors.
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2010

The fluorescence of CdSe/ZnS semiconductor quantum rods (QRs) in the CdSe/ZnS-hexane pentylcyanobiphenyl and CdSe/ZnS-methyl methacrylate pentylcyanobiphenyl multicomponent systems has been investigated. It is shown that the presence of pentylcyanobiphenyl affects differently the QR fluorescence in each composite. The QR fluorescence in hexane solutions is efficiently quenched in the presence of pentylcyanobiphenyl, whereas in the composites based on methyl-methacrylate the QR fluorescence is enhanced as a result of the introduction of pentylcyanobiphenyl in the mesomorphic state. This difference is explained by the different forms of pentylcyanobiphenyl in these systems. The composites based on structured porous polyethylene films containing QR s in a mesomorphic medium have been obtained for the first time. The measured degree of polarization of the QR fluorescence characterizes the composite as strongly ordered. © Pleiades Publishing Ltd. 2010.


Perlin E.Y.,Institute of Fine Mechanics and Optics | Levitskii R.S.,Institute of Fine Mechanics and Optics | Ivanov A.V.,Institute of Fine Mechanics and Optics | Eliseev K.A.,Institute of Fine Mechanics and Optics
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2015

A new model of photogeneration of nonequilibrium electron-hole pairs in crystal with deep impurities is proposed. The probabilities of two-center transitions between band and impurity states with simultaneous absorption of photon and energy transfer between electrons interacting in accordance with the Coulomb law are calculated within the second-order perturbation theory. The two-band zero-range potential model is used to describe deep-impurity states. © 2015, Pleiades Publishing, Ltd.

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