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31.
The medium susceptibility related to stimulated Raman scattering (SRS) is known to be a complex value whose imaginary part
determines the SRS gain coefficient whereas the real part constitutes a small fraction of the refractive index at the frequencies
of the scattered emission that is proportional to the intensity of the exciting beam. Strong transverse nonuniformity of this
beam causes focusing of high-frequency components of the scattered light and defocusing of low-frequency ones that inevitably
affect their amplification efficiency. The effect for Gaussian pumping is responsible for a slight shift of the SRS gain spectrum
towards higher frequencies. The present work analyzes theoretically SRS excited by a Bessel light beam and demonstrates that
the axial component of the scattered emission experiences a frequency shift that is much greater than that for the case of
Gaussian beam pumping.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 75, No. 3, pp. 336–341, May–June, 2008. 相似文献
32.
L. V. Chulkov 《Few-Body Systems》2008,44(1-4):263-267
An experimental investigation of drip-line nuclei by using quasi-free knockout is discussed. The reaction formalism reformulated in terms of Mandelstam variables allows extraction of valuable information from measurements with radioactive beams made in inverse kinematics. 相似文献
33.
34.
S. K. Chulkov N. F. Stepanov Yu. V. Novakovskaya 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2009,83(5):798-808
The ground and low-lying excited states of H3O(H2O) k radicals are studied. The character of the unpaired electron localization in the systems is analyzed, and the relative probability of the radical dissociation onto a water cluster and atomic hydrogen is estimated. Reaction coordinates of the dissociation are constructed and conditions of metastable existence of an H3O radical are determined. Structures, in which H3O can spontaneously dissociate, are found. Lifetimes of H3O(H2O) k clusters before the hydrogen atom detachment at the initial conditions of two kinds, namely, upon the vertical attachment of an electron to H3O+(H2O) k cations and upon the vibrational excitation of metastable neutral H3O(H2O) k systems, are estimated. 相似文献
35.
36.
Abdullaev N. A. Amiraslanov I. R. Aliev Z. S. Jahangirli Z. A. Sklyadneva I. Yu. Alizade E. G. Aliyeva Y. N. Otrokov M. M. Zverev V. N. Mamedov N. T. Chulkov E. V. 《JETP Letters》2022,115(12):749-756
JETP Letters - This work is devoted to the experimental study and symmetry analysis of the Raman-active vibration modes in MnBi2Te4·n(Bi2Te3) van der Waals topological insulators, where n is... 相似文献
37.
First-principles calculations are performed to obtain the dielectric function and loss spectra of bulk PdH(x). Hydrogen concentrations between x = 0 and 1 are considered. The calculated spectra are dominated by a broad peak that redshifts in energy with x. The obtained bulk dielectric function is employed to compute the loss spectra of PdH(x) spherical nanoparticles as a function of x. The dominant plasmon peak in the spherical nanoparticle is lowered in energy with respect to the bulk case. However, the dependence of the resonance energy on the hydrogen concentration is roughly similar to that in bulk. 相似文献
38.
We present results of a comparative study of the vibrational spectrum and local density of phonon states in ordered p(2 x 2) and (√3 x √3)R30° structures formed by potassium atoms on the Pt(111) surface. The calculations were performed with tight-binding interatomic interaction potentials. It was found that the mode associated with vertical displacements of K adatoms has an energy of about 20 meV in both K structures. The strength and energy of this mode slightly decreases with increasing coverage. This result is in good agreement with available experimental data. As in time-resolved second harmonic generation measurements, we observed low frequency modes for both structures considered, which are caused by the interaction of potassium with the second layer of the substrate. 相似文献
39.
P.V. Shpak S.V. Voitikov R.V. Chulkov P.A. Apanasevich V.A. Orlovich A.S. Grabtchikov A. Kushwaha N. Satti L. Agrawal A.K. Maini 《Optics Communications》2012,285(17):3659-3664
We demonstrate a passively Q-switched all-solid-state laser system with intracavity Raman frequency conversion to the eye-safe spectral region. Laser oscillation at the 1.064 μm wavelength with a pulse repetition rate of several kilohertz was provided by a Nd:YAG crystal and a Cr:YAG passive absorber. Third Stokes oscillations at the 1.599 and 1.494 μm wavelengths were obtained in Ba(NO3)2 and PbWO4 crystals with output pulse energies of 5 μJ and 6 μJ, respectively. The results of the numerical simulation of the pulse dynamics are in good agreement with the experimental data. 相似文献
40.
I. V. Silkin T. V. Menshchikova M. M. Otrokov S. V. Eremeev Yu. M. Koroteev M. G. Vergniory V. M. Kuznetsov E. V. Chulkov 《JETP Letters》2012,96(5):322-325
The electronic structure of quaternary natural minerals PbBi2Te2S2 (aleksite), Pb2Bi2Te2S3 (saddlebackite), and PbBi4Te4S3 (C phase) has been theoretically studied. These compounds have a layered structure: aleksite and saddlebackite are formed by seven- and nine-layer blocks, respectively, and C phase consists of five- and seven-layer blocks separated by van der Waals gaps. It has been shown that all studied materials are three-dimensional topological insulators with a wide band gap in the electronic spectrum and have a high spin polarization. For these reasons, they are promising for applications. 相似文献