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Лазерная модификация титановой пленки на поверхности оптических волноводов в ниобате лития
Письма в Журнал технической физики. 2020. Т. 46. № 17. С. 51-54.
Тронев А. В., Парфенов М. В., Соломонов Н. А., Ionov A. M., Божко С. И., Ильичев И. В., Агрузов П. М., Шамрай А. В.
Priority areas:
engineering science
Language:
Russian
Gordeev N. Y., Payusov A. S., Shernyakov Y. M. et al., Laser Physics 2019 Vol. 29 No. 2 Article 025003
The influence of waveguide parameters (thicknesses and contrasts in both transverse and
lateral directions) on optical mode compositions in narrow-ridge lasers is numerically
investigated. The proposed numerical model explains our experimental results on the drastic
difference in optical mode compositions in broad-area and narrow-ridge lasers processed from
the same wafer based on a broadened GaAs/AlGaAs transverse-waveguide heterostructure.
It is shown ...
Added: March 16, 2021
Шерняков Ю. М., Гордеев Н. Ю., Паюсов А. С. et al., Физика и техника полупроводников 2021 Т. 55 № 3 С. 256-263
Edge-emitting lasers with active regions based on novel InGaAs/GaAs quantum heterostructures of transitional dimensionality, i.e., quantum well-dots, which are intermediate in properties between quantum wells and quantum dots, are studied. It is shown that the rate of the lasing-wavelength blue shift decreases with increasing number of quantum well-dot layers in the active region and with ...
Added: April 19, 2021
Boldyrev K., Попова М. Н., Optical Materials 2017 Vol. 63 P. 101-104
We report on the first high-resolution optical spectroscopy study of LiYF4:Ho in an external magnetic field. Peculiarities in the hyperfine structure of holmium spectral lines are discussed for the cases H||c and H⊥c (H = 0.53 and 0.87 T). The spectra reveal a strong interaction between crystal-field levels, mediated by Zeeman and hyperfine terms in the Hamiltonian. A ...
Added: February 8, 2019
Ferrari S., Kovalyuk V., Hartmann W. et al., Optics Express 2017 Vol. 25 No. 8 P. 8739-8750
We investigate how the bias current affects the hot-spot relaxation dynamics in niobium nitride. We use for this purpose a near-infrared pump-probe technique on a waveguide-integrated superconducting nanowire single-photon detector driven in the two-photon regime. We observe a strong increase in the picosecond relaxation time for higher bias currents. A minimum relaxation time of (22 ...
Added: June 6, 2017
Pudalov V., Vlasenko V., Pervakov K. et al., IEEE Transactions on Applied Superconductivity 2019 Vol. 29 No. 3 P. 6900505-1-5
The FeSe wires and tapes with Fe (S22 steel) and Cu/Nb sheath were fabricated by various modifications of the
powder-in-tube (PIT) method. The superconducting critical parameters (upper critical field, critical current, critical temperature) depending on heat treatment time were investigated using resistive R(T) and transport measurements I (V) in magnetic fields up to 9T. The low-temperature ...
Added: November 26, 2019
Rumyantsev B. V., Guk I. V., Kozachuk A. I. et al., Acta Astronautica 2020 Vol. 176 P. 609-612
The authors investigate aluminum shaped charge jet (SCJ) penetration into an aluminum alloy target at 8–11 km/s velocities. The analysis of kinetics, penetration parameters and structures of cavern surfaces formed after the penetration show that at velocities exceeding 9–11 km/s, the hydrodynamic character of the penetration changes due to the melting of the interacting materials. When during ...
Added: September 19, 2020
Idrissi A., Kiselev M. G., Kalinichev A. G., Journal of Molecular Liquids 2017 Vol. 239 P. 1-2
Professor Yuri E. Gorbatywas born 30 July 1932 in the city Grozny, in the Soviet Union. He has graduated from the Mendeleev Institute of Chemical Technology,Moscow, in 1955. He has got his Candidate of Sciences (Ph.D.) degree in 1963 for his work on “Non-equilibrium crystallization of the three-componentmelts”, and later in 1988 he was awarded ...
Added: July 13, 2017
Sattayaporn S., Loiseau P., Aka G. et al., Journal of Luminescence 2020 Vol. 219 P. 116895
Single crystals of Pr3+ doped hexa-aluminate Sr0.7La0.3Mg0.3Al12O19 (ASL) were prepared for spectroscopic
characterization. We investigated their optical spectroscopic properties in σ and π polarization of light. Absorption
spectra were recorded in extended spectral range, 400 nm–5400 nm. Energies of Pr3+ crystal field states
were determined. In addition to the major D3h sites, minor sites were found. Judd-Ofelt analysis was performed:
the ...
Added: October 22, 2020
V. E. Anikeeva, Semenova O. I., Tereshchenko O. E., Journal of Physics: Conference Series 2018 Vol. 1124 No. 4 P. 041008
For the past five years methyl-ammonium lead trihalide perovskite solar cells have shown remarkable progress in power conversion efficiencies due to their unique properties. Single CH3NH3PbI3 crystals were grown on the base of concentrated aqueous solution condensation of the precursor. The grown crystal structure and stoichiometry were studied by RHEED, X-ray and XPS. The perovskite crystal ...
Added: October 23, 2020
Ionov A. M., Ageeva T., Golubev D. et al., Macroheterocycles 2018 Vol. 11 No. 2 P. 155-161
Synthesis of bismuth complexes of etioporphyrin II, protoporphyrin IX dimethyl ester and three tetraphenylporphyrin derivatives in which iodine atom is an extraligand, was carried out. Obtained compounds were characterized by mass spectrometry, UV-vis, 1H NMR spectroscopy, and HPLC. The study of X-ray spectra showed that bismuth valence is +3. Bismuth atom coordinates four nitrogen atoms ...
Added: December 10, 2020
Boldyrev K., Gutsenko D. D., Klimin S. A. et al., Optics and Spectroscopy 2020 Vol. 128 No. 9 P. 1374-1378
We have studied high-resolution low-temperature IR luminescence and absorption spectra of
undoped high-quality SiC single crystals of the 4H and 6H hexagonal modifications. Narrow lines with a
width of smaller than 0.2 cm–1 have been revealed, with some of which being observed for the first time. We
have found that some of the lines in the 4H and ...
Added: October 22, 2020
Кузьмин Н. Н., Климин С. А., Маврин Б. Н. et al., Data in Brief 2020 Vol. 28 P. 104889
In “Lattice dynamics and structure of the new langasites
Ln3CrGe3Be2O14 (Ln ¼ La, Pr, Nd): vibrational spectra and ab initio
calculations” [1], experimental and calculated results on lattice
dynamics of the recently discovered new compounds La3CrGe3Be2O14, Pr3CrGe3Be2O14, and Nd3CrGe3Be2O14 are reported. These
compounds belong to the langasite series and constitute a new
class of low-dimensional antiferromagnets. The data presented in
this ...
Added: October 22, 2020
Расходчиков А. В., Щербак С. А., Kryzhanovskaya N. et al., Journal of Physics: Conference Series 2020
We performed a numerical study of a surrounding medium influence on coupling efficiency between a microdisk resonator supporting optical whispering gallery modes and a straight optical waveguide. Quality factors of the modes and relative optical power coupled to the waveguide were calculated using COMSOL Multiphysics environment. It was shown that the most efficient coupling takes ...
Added: December 7, 2020
Boldyrev K., Романов А., Хаула Е. et al., Journal of the American Ceramic Society 2019 Vol. 102 No. 5 P. 2745-2751
Single crystal of TlCl was doped with NIR photoluminescent univalent bismuth cations by prolonged immersion in liquid bismuth metal. The ion exchange Tl+ + Bi0 ↔ Tl0 + Bi+ at the crystal surface with subsequent Bi+ migration to the bulk are expected to drive the doping process. Contrary with Bi‐doped TlCl crystals, grown by Bridgman method, the ion exchange does ...
Added: February 8, 2019
Zhukov A., Kryzhanovskaya N., Moiseev E. et al., Физика и техника полупроводников 2020 Т. 54 № 6 С. 570-574
A model is developed that makes it possible to analytically determine the threshold current of a microdisk laser with consideration for its self-heating as a function of the ambient temperature and the microlaser diameter. It is shown that there exists a minimum microdisk diameter determined by self-heating, up to which continuous-wave lasing can be reached ...
Added: September 15, 2020
ФГБНУ "НИИ ПМТ", 2019
Труды содержат представленные на конференцию доклады из вузовских, академических и отраслевых организаций России и стран СНГ (Армении, Азербайджана, Белоруссии, Казахстана, Узбекистана). В опубликованных докладах содержатся новые результаты исследований процессов образования, миграции и эволюции радиационных дефектов в твердых телах, радиационно-технологических методов модифицирования и обработки материалов с целью улучшения их эксплуатационных свойств, эффектов радиационно-стимулированной диффузии, радиационно-индуцированной сегрегации ...
Added: August 16, 2019
Boldyrev K., Маврин Б. Н., Шерин П. С. et al., Journal of Luminescence 2018 Vol. 193 P. 119-124
We report on the quantum yield (eta) and decay time (tau) measurements at room temperature for the bright red-orange (602 nm) luminescence from new germanium-vacancy (Ge-V) centers in nano- and microcrystalline diamonds synthesized at high pressure and high temperature. The values eta = 3 +/- 1% and tau = 6.2 +/- 0.2 ns were found. ...
Added: February 8, 2019
M. : Association of graduates and employees of AFEA named after prof. Zhukovsky, 2018
The materials of The International Scientific – Practical Conference is presented below.
The Conference reflects the modern state of innovation in education, science, industry and social-economic sphere, from the standpoint of introducing new information technologies.
It is interesting for a wide range of researchers, teachers, graduate students and professionals in the field of innovation and information technologies. ...
Added: May 24, 2018
Tikhomirova K., Tantardini C., Sukhanova E. et al., The Journal of Physical Chemistry Letters 2020 No. 11 P. 3821-3827
NaCl is one of the simplest compounds and was thought to be well-understood, and yet, unexpected complexities related to it were uncovered at high pressure and in low-dimensional states. Here, exotic hexagonal NaCl thin films on the (110) diamond surface were crystallized in the experiment following a theoretical prediction based on ab initio evolutionary algorithm USPEX. State-of-the-art ...
Added: May 8, 2020
Semenok D. V., Kvashnin А. G., Ivanova A. G. et al., Materials Today 2020 Vol. 33 P. 36-44
Here we report targeted high-pressure synthesis of two novel high-TC hydride superconductors, P63/mmc-ThH9 and Fm3m-ThH10, with the experimental critical temperatures (TC) of 146 K and 159–161 K and upper critical magnetic fields 38 and 45 Tesla at pressures 170–175 Gigapascals, respectively. Superconductivity was evidenced by the observation of zero resistance and a decrease of TC under external magnetic field ...
Added: November 26, 2019
Boldyrev K., Седов В., Кривобок В. et al., Physica Status Solidi (A) Applications and Materials 2017 Vol. 214 No. 11 P. 1700198-1-1700198-8
The effect of isotopic modification of diamond lattice on photoluminescence (PL) and optical absorption spectra of ensembles of SiV− centers was studied. Thin epitaxial diamond layers were grown by a microwave plasma CH4/H2 mixtures using methane enriched to 99.96% for either 12C or 13C isotopes, while the Si doping was performed by adding a small percentage of silane SiH4 into ...
Added: February 8, 2019
Boldyrev K., Малкин Б. З., Абишев Н. М. et al., Physical Review B: Condensed Matter and Materials Physics 2017 Vol. 96 No. 1 P. 014116-1-014116-13
We construct a distribution function of the strain-tensor components induced by point defects in an elastically anisotropic continuum, which can be used to account quantitatively for many effects observed in different branches of condensed matter physics. Parameters of the derived six-dimensional generalized Lorentz distribution are expressed through the integrals computed over the array of strains. ...
Added: February 8, 2019
Boldyrev K., Мельников А. А., Селиванов Ю. Г. et al., Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 97 No. 21 P. 214304-1-214304-10
We report an observation of coherent phonons of E-g(1), E-u(1), A(1g)(1), and E-g(2) symmetry generated in a single-crystal film of Bi2Se3 by an intense single-cycle THz pulse. The atomic vibrations reveal themselves through periodic modulation of the refractive index of the film. The largest signal is detected at the frequency of 4.05 THz that corresponds ...
Added: February 8, 2019
Chaika A. N., Bozhko S. I., Sveklo I. et al., Scripta Materialia 2021 Vol. 194
We have studied the solid state dewetting of ten monolayer sthick Ag film deposited on periodicall ypatterned Si(557) surface. The annealing of the system in the ultra-high vacuum at the temperatures between 300 and 400°C resulted in full agglomeration of the film and formation of faceted single crystalline Ag nanoparticles exhibiting bimodal size distribution.We demonstrated ...
Added: December 10, 2020