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- W2045160962 abstract "Photoinduced second harmonic generation (SHG) in Bi2Se3–CaBr2–PbCl2 optical fibers have been studied using experimental and theoretical quantum chemical and molecular-dynamics methods. Infra-red (IR) induced SHG was measured in the IR region within the 5.5–21μm. CO laser (λ=5.5μm) was used as a source of the photoinducing IR light. The glasses had diameters varied within the 5–35μm. The lengths of the fibers varied from 0.5 cm up to the 1.4 m. We have found that with increasing photoinducing power, the SHG for the doubled frequency 5.3μm of the CO2-laser increases and achieves its maximum value at photoinducing power 1.35GW/cm2 per pulse. The maximal by achieved values of the second-order nonlinear optical susceptibilities d222 was equal about 1.5 pm/V. With decreasing temperature, the SHG signal strongly increases within the 75–220 K temperature range. Picosecond probe–pump measurements indicate on the occurrence of the SHG maximum at pump–probe time delay about 25 ps. These dependencies we explain within a framework of the quantum chemical approach taken into acount photoinduced anharmonic electron–phonon interactions. We have found that Bi–Se tetrahedral bonds play a key role in the observed IR photoinduced nonlinear optical (NLO) effects. The obtained results show that the mentioned glasses may be applied as materials for IR picosecond–second quantum electronics." @default.
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- W2045160962 date "2002-04-01" @default.
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- W2045160962 title "Photoinduced second harmonic generation in Bi2Se3–CaBr2–PbCl2 optical fibers" @default.
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- W2045160962 doi "https://doi.org/10.1016/s0030-4018(02)01192-6" @default.
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