The effect of structural differences of dimethylamine-substituted styrene dyes of the pyridine and quinoline series on the nonlinearity of the 2nd and 3rd order in their microcrystalline powders

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Resumo

The spectral behavior of a styrene dye of the quinoline series of type D-p-A in solvents of various natures has been studied, pronounced solvatochromism and sensitivity to the viscosity of the medium have been found. Studies of microcrystalline dye powder by laser radiation on chromium-forsterite with a wavelength of 1250 nm have been carried out. The observed differences in the nonlinearity of the 2nd order are correlated with the structural differences of analog compounds, as well as with the factors organizing the supramolecular system in the crystal.

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Sobre autores

E. Medyantsev

National Research Centre "Kurchatov Institute"; Moscow Institute of Physics and Technology

Autor responsável pela correspondência
Email: evgenkupffer@gmail.com

Центр фотохимии Курчатовского комплекса кристаллографии и фотоники

Rússia, Moscow; Dolgoprudny

N. Lobova

National Research Centre "Kurchatov Institute"; Moscow Institute of Physics and Technology

Email: evgenkupffer@gmail.com

Центр фотохимии Курчатовского комплекса кристаллографии и фотоники

Rússia, Moscow; Dolgoprudny

A. Koshkin

National Research Centre "Kurchatov Institute"

Email: evgenkupffer@gmail.com

Центр фотохимии Курчатовского комплекса кристаллографии и фотоники

Rússia, Moscow

A. Ivanov

National Research Centre "Kurchatov Institute"

Email: evgenkupffer@gmail.com

Центр фотохимии Курчатовского комплекса кристаллографии и фотоники

Rússia, Moscow

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2. Fig. 1. Structure of DAST and DAQT dyes (in two conformations).

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3. Fig. 2. Schematic diagram of the experimental setup. LBO – SHG crystal, F – spectral filter, L1 – lens with a focal length of 1 cm, K – cuvette with DAST powder, L2 – lens with a focal length of 5 cm.

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4. Fig. 3. Absorption (a) and fluorescence (b) spectra of DAQT dye in solvents of different nature (CDAQT = 2∙10–5 M).

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5. Fig. 4. Geometry of the s-cis-conformation of DAQT dye calculated by the density functional method.

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6. Fig. 5. Signals of the second optical harmonic and two-photon excited luminescence in microcrystalline powder of DAQT dye irradiated with femtosecond pulses at a wavelength of 1250 nm for two positions of the cuvette with the powder when it is moved perpendicular to the direction of the pump beam (a), (image of the sample in the setup is in the inset); spectra of two-photon excitation of luminescence at different average powers of femtosecond radiation at a wavelength of 1250 nm (b) (the inset shows the dependence of the intensity of two-photon excited luminescence on the average power of the femtosecond excitation pulses and its extrapolation by a parabolic function).

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