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1. Reshape Dimensions Network for Speaker Recognition

Author

Yakovlev, Ivan, Makarov, Rostislav, Balykin, Andrei, Malov, Pavel, Okhotnikov, Anton, and Torgashov, Nikita

Subjects
Electrical Engineering and Systems Science - Audio and Speech Processing
Abstract

In this paper, we present Reshape Dimensions Network (ReDimNet), a novel neural network architecture for extracting utterance-level speaker representations. Our approach leverages dimensionality reshaping of 2D feature maps to 1D signal representation and vice versa, enabling the joint usage of 1D and 2D blocks. We propose an original network topology that preserves the volume of channel-timestep-frequency outputs of 1D and 2D blocks, facilitating efficient residual feature maps aggregation. Moreover, ReDimNet is efficiently scalable, and we introduce a range of model sizes, varying from 1 to 15 M parameters and from 0.5 to 20 GMACs. Our experimental results demonstrate that ReDimNet achieves state-of-the-art performance in speaker recognition while reducing computational complexity and the number of model parameters., Comment: Proceedings of Interspeech

Published
2024
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2. LRPD: Large Replay Parallel Dataset

Author

Yakovlev, Ivan, Melnikov, Mikhail, Bukhal, Nikita, Makarov, Rostislav, Alenin, Alexander, Torgashov, Nikita, and Okhotnikov, Anton

Subjects
Electrical Engineering and Systems Science - Audio and Speech Processing, Computer Science - Sound
Abstract

The latest research in the field of voice anti-spoofing (VAS) shows that deep neural networks (DNN) outperform classic approaches like GMM in the task of presentation attack detection. However, DNNs require a lot of data to converge, and still lack generalization ability. In order to foster the progress of neural network systems, we introduce a Large Replay Parallel Dataset (LRPD) aimed for a detection of replay attacks. LRPD contains more than 1M utterances collected by 19 recording devices in 17 various environments. We also provide an example training pipeline in PyTorch [1] and a baseline system, that achieves 0.28% Equal Error Rate (EER) on evaluation subset of LRPD and 11.91% EER on publicly available ASVpoof 2017 [2] eval set. These results show that model trained with LRPD dataset has a consistent performance on the fully unknown conditions. Our dataset is free for research purposes and hosted on GDrive. Baseline code and pre-trained models are available at GitHub.

Published
2023
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3. The ID R&D VoxCeleb Speaker Recognition Challenge 2023 System Description

Author

Torgashov, Nikita, Makarov, Rostislav, Yakovlev, Ivan, Malov, Pavel, Balykin, Andrei, and Okhotnikov, Anton

Subjects
Electrical Engineering and Systems Science - Audio and Speech Processing
Abstract

This report describes ID R&D team submissions for Track 2 (open) to the VoxCeleb Speaker Recognition Challenge 2023 (VoxSRC-23). Our solution is based on the fusion of deep ResNets and self-supervised learning (SSL) based models trained on a mixture of a VoxCeleb2 dataset and a large version of a VoxTube dataset. The final submission to the Track 2 achieved the first place on the VoxSRC-23 public leaderboard with a minDCF(0.05) of 0.0762 and EER of 1.30%.

Published
2023

4. Algorithms for Length Spectra of Combinatorial Tori

Author

Delecroix, Vincent, Ebbens, Matthijs, Lazarus, Francis, and Yakovlev, Ivan

Subjects
Computer Science - Computational Geometry, Mathematics - Geometric Topology, Mathematics - Metric Geometry, 54-08, 68U05, F.2.2
Abstract

Consider a weighted, undirected graph cellularly embedded on a topological surface. The function assigning to each free homotopy class of closed curves the length of a shortest cycle within this homotopy class is called the marked length spectrum. The (unmarked) length spectrum is obtained by just listing the length values of the marked length spectrum in increasing order. In this paper, we describe algorithms for computing the (un)marked length spectra of graphs embedded on the torus. More specifically, we preprocess a weighted graph of complexity $n$ in time $O(n^2 \log \log n)$ so that, given a cycle with $\ell$ edges representing a free homotopy class, the length of a shortest homotopic cycle can be computed in $O(\ell+\log n)$ time. Moreover, given any positive integer $k$, the first $k$ values of its unmarked length spectrum can be computed in time $O(k \log n)$. Our algorithms are based on a correspondence between weighted graphs on the torus and polyhedral norms. In particular, we give a weight independent bound on the complexity of the unit ball of such norms. As an immediate consequence we can decide if two embedded weighted graphs have the same marked spectrum in polynomial time. We also consider the problem of comparing the unmarked spectra and provide a polynomial time algorithm in the unweighted case and a randomized polynomial time algorithm otherwise., Comment: 33 pages, 16 figures

Published
2023

5. Contribution of $n$-cylinder square-tiled surfaces to Masur-Veech volume of $\mathcal{H}(2g-2)$

Author

Yakovlev, Ivan

Subjects
Mathematics - Geometric Topology, Mathematics - Combinatorics
Abstract

We find the generating function for the contributions of $n$-cylinder square-tiled surfaces to the Masur-Veech volume of $\mathcal{H}(2g-2)$. It is a bivariate generalization of the generating function for the total volumes obtained by Sauvaget via intersection theory. Our approach is, however, purely combinatorial. It relies on the study of counting functions for certain families of metric ribbon graphs. Their top-degree terms are polynomials, whose (normalized) coefficients are cardinalities of certain families of metric plane trees. These polynomials are analogues of Kontsevich polynomials that appear as part of his proof of Witten's conjecture., Comment: 30 pages, 5 figures

Published
2022
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7. Generating families on arboreal graphs

Author

Yakovlev, Ivan

Subjects
Mathematics - Symplectic Geometry
Abstract

The paper is devoted to the study of exact curves on Arborealized Liouville surfaces. We introduce the notion of a generating family for such curves. Our main statement is a hamiltonian lifting property: the set of curves admitting a generating family is closed with respect to Hamiltonian isotopes. This is part of the author's future thesis. It will be translated into English within a few weeks. In the future, we plan to generalize our results in several directions and find applications., Comment: in Russian. Keywords: Symplectic surfaces, Generating families, Arboreal spaces

Published
2021

9. Dark cytotoxicity beyond photo-induced one of silica nanoparticles incorporated with RuII nitrosyl complexes and luminescent {Mo6I8} cluster units

Author

Bochkova, Olga, Fedorenko, Svetlana, Mikhailov, Artem, Kostin, Gennadiy, Mikhailov, Maxim, Sokolov, Maxim, Elistratova, Julia, Kholin, Kirill, Tarasov, Maxim, Budnikova, Yulia, Sibgatullina, Guzel, Samigullin, Dmitry, Nizameev, Irek, Salnikov, Vadim, Yakovlev, Ivan, Rozhentsova, Darina, Lyubina, Anna, Amerhanova, Syumbelya, Voloshina, Alexandra, Gerasimova, Tatiana, and Mustafina, Asiya

Published
2024
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11. Ligand Environment and Light: Two Triggers for Controlling Cytotoxicity of Ruthenium Nitrosyl Complexes.

Author

Yakovlev, Ivan A., Golubeva, Julia A., Klyushova, Lyubov S., Nadolinny, Vladimir A., Kostin, Gennadiy A., and Mikhailov, Artem A.

Subjects
*NITROSYL compounds, *CYTOTOXINS, *LIGANDS (Chemistry), *RUTHENIUM compounds, *NITRIC oxide, *CHARGE transfer, *LIPOPHILICITY
Abstract

Photoinduced nitric oxide (NO) release for complexes [RuNO(L)2(NO2)2OH], where L=methyl isonicotinate (1), ethyl isonicotinate (2), methyl nicotinate (3) and ethyl nicotinate (4) was studied in DMSO, MeCN and water solutions (PBS, CTAB) using spectroscopic methods (UV‐vis, IR, EPR) and spectrometric techniques (ESI‐MS). Additionally, we present methodological evidence for improving the calculation of the quantum yield (QY) of NO release through the utilization of a combined IR‐UV‐vis‐spectroscopy flow‐through setup. According to DFT calculations, the production of nitric oxide occurs through the photoinduced cleavage of the Ru−NO bond, triggered by irradiation at 445 or 532 nm. This cleavage is a consequence of charge transfer from the orbitals of the Ru−OH group and the equatorial ligands (HOMO, HOMO‐1) to the Ru−NO antibonding orbital (LUMO). The cytotoxicity and photoinduced cytotoxicity of the investigated compounds were assessed against the breast adenocarcinoma cell line MCF‐7. Moreover, the investigation of the lipophilic properties of compounds 1–4 unveiled a significant influence of their lipophilicity on cytotoxic behavior, allowing for the modification of cytotoxicity through changes in the ligand L or by light irradiation. [ABSTRACT FROM AUTHOR]

Published
2024
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15. Dual Adeno-Associated Virus 9 with Codon-Optimized DYSF Gene Promotes In Vivo Muscle Regeneration and May Decrease Inflammatory Response in Limb Girdle Muscular Dystrophy Type R2

Author

Yakovlev, Ivan A., primary, Emelin, Aleksei M., additional, Slesarenko, Yana S., additional, Limaev, Igor S., additional, Vetrova, Iuliia A., additional, Belikova, Liliya D., additional, Grafskaia, Ekaterina N., additional, Bobrovsky, Pavel A., additional, Pokrovsky, Mikhail V., additional, Kuzubova, Elena V., additional, Pokrovsky, Vladimir M., additional, Lebedev, Pyotr A., additional, Bardakov, Sergei N., additional, Isaev, Artur A., additional, and Deev, Roman V., additional

Published
2023
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16. Exawatt Center for Extreme Light Studies (XCELS)

Author

Khazanov, Efim, primary, Shaykin, Andrey, additional, Kostyukov, Igor, additional, Ginzburg, Vladislav, additional, Mukhin, Ivan, additional, Yakovlev, Ivan, additional, Soloviev, Alexander, additional, Kuznetsov, Ivan, additional, Mironov, Sergey, additional, Korzhimanov, Artem, additional, Bulanov, Denis, additional, Shaikin, Ilya, additional, Kochetkov, Anton, additional, Kuzmin, Alexey, additional, Martyanov, Mikhail, additional, Lozhkarev, Vladimir, additional, Starodubtsev, Mikhail, additional, Litvak, Alexander, additional, and Sergeev, Alexander, additional

Published
2023
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18. Genetic screening of an endemic mutation in the DYSF gene in an isolated, mountainous population in the Republic of Dagestan

Author

Bardakov, Sergey N., primary, Deev, Roman V., additional, Isaev, Аrtur А., additional, Khromov‐Borisov, Nikita N., additional, Kopylov, Evgeniy D., additional, Savchuk, Мaria R., additional, Pushkin, Maxim S., additional, Presnyakov, Evgeniy V., additional, Magomedova, Raisat M., additional, Achmedova, Patimat G., additional, Umakhanova, Zoya R., additional, Kaimonov, Vladimir S., additional, Musatova, Elizaveta V., additional, Blagodatskikh, Konstantin А., additional, Tveleneva, Aleksandra А., additional, Sofronova, Yana V., additional, and Yakovlev, Ivan A., additional

Published
2023
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19. Growth Process, Structure and Electronic Properties of Cr2GeC and Cr2-xMnxGeC Thin Films Prepared by Magnetron Sputtering

Author

Tarasov, Anton S., primary, Lyaschenko, Sergey A., additional, Rautskii, Mikhail V., additional, Lukyanenko, Anna V., additional, Andryushchenko, Tatiana A., additional, Solovyov, Leonid A., additional, Yakovlev, Ivan A., additional, Maximova, Olga A., additional, Shevtsov, Dmitriy V., additional, Bondarev, Mikhail A., additional, Bondarev, Ilya A., additional, Ovchinnikov, Sergei G., additional, and Varnakov, Sergey N., additional

Published
2023
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20. Selective synthesis of higher manganese silicides: a new Mn17Si30 phase, its electronic, transport, and optical properties in comparison with Mn4Si7

Author

Tarasov, Ivan A., Visotin, Maxim A., Kuznetzova, Tatiana V., Aleksandrovsky, Aleksandr S., Solovyov, Leonid A., Kuzubov, Aleksandr A., Nikolaeva, Kristina M., Fedorov, Aleksandr S., Tarasov, Anton S., Tomilin, Felix N., Volochaev, Michail N., Yakovlev, Ivan A., Smolyarova, Tatiana E., Ivanenko, Aleksandr A., Pryahina, Victoria I., Esin, Alexander A., Yarmoshenko, Yuri M., Shur, Vladimir Ya, Varnakov, Sergey N., and Ovchinnikov, Sergey G.

Published
2018
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22. Suppressing small-scale self-focusing of high-power femtosecond pulses

Author

Martyanov, Mikhail, primary, Ginzburg, Vladislav, additional, Balakin, Alexey, additional, Skobelev, Sergey, additional, Silin, Dmitry, additional, Kochetkov, Anton, additional, Yakovlev, Ivan, additional, Kuzmin, Alexey, additional, Mironov, Sergey, additional, Shaikin, Ilya, additional, Stukachev, Sergey, additional, Shaykin, Andrey, additional, Khazanov, Efim, additional, and Litvak, Alexander, additional

Published
2023
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24. Sublayer-Enhanced Growth of Highly Ordered Mn5Ge3 Thin Film on Si(111)

Author

Yakovlev, Ivan, primary, Tarasov, Ivan, additional, Lukyanenko, Anna, additional, Rautskii, Mikhail, additional, Solovyov, Leonid, additional, Sukhachev, Alexander, additional, Volochaev, Mikhail, additional, Efimov, Dmitriy, additional, Goikhman, Aleksandr, additional, Bondarev, Ilya, additional, Varnakov, Sergey, additional, Ovchinnikov, Sergei, additional, Volkov, Nikita, additional, and Tarasov, Anton, additional

Published
2022
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25. Research in plasma physics and particle acceleration using the PEARL petawatt laser

Author

Soloviev, Aleksandr A., primary, Burdonov, Konstantin F., additional, Ginzburg, Vladislav N., additional, Glyavin, Mikhail Yu., additional, Zemskov, Roman S., additional, Kotov, Aleksandr V., additional, Kochetkov, Anton A., additional, Kuzmin, Aleksei A., additional, Murzanev, Aleksey A., additional, Mukhin, Ivan B., additional, Perevalov, Sergei E., additional, Pikuz, Sergei A., additional, Starodubtsev, Mikhail V., additional, Stepanov, Andrei N., additional, Fuchs, Julian, additional, Shaikin, Il'ya A., additional, Shaikin, Andrei A., additional, Yakovlev, Ivan V., additional, and Khazanov, E.A., additional

Published
2022
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26. Improving focusability of post-compressed PW laser pulses using a deformable mirror

Author

Soloviev, Alexander, primary, Kotov, Alexander, additional, Martyanov, Mikhail, additional, Perevalov, Sergey, additional, Zemskov, Roman, additional, Starodubtsev, Mikhail, additional, Alexandrov, Alexander, additional, Galaktionov, Ilya, additional, Samarkin, Vadim, additional, Kudryashov, Alexis, additional, Yakovlev, Ivan, additional, Ginzburg, Vladislav, additional, Kochetkov, Anton, additional, Shaikin, Ilya, additional, Kuzmin, Alexey, additional, Stukachev, Sergey, additional, Mironov, Sergey, additional, Shaykin, Andrey, additional, and Khazanov, Efim, additional

Published
2022
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28. Growth Process, Structure and Electronic Properties of Cr 2 GeC and Cr 2-x Mn x GeC Thin Films Prepared by Magnetron Sputtering.

Author

Tarasov, Anton S., Lyaschenko, Sergey A., Rautskii, Mikhail V., Lukyanenko, Anna V., Andryushchenko, Tatiana A., Solovyov, Leonid A., Yakovlev, Ivan A., Maximova, Olga A., Shevtsov, Dmitriy V., Bondarev, Mikhail A., Bondarev, Ilya A., Ovchinnikov, Sergei G., and Varnakov, Sergey N.

Subjects
MAGNETRON sputtering, THIN films, ELECTRONIC structure, METALLIC films, HOPPING conduction, CARRIER density
Abstract

The growth and phase formation features, along with the influence of structure and morphology on the electronic, optical, and transport properties of Cr2GeC and Cr2-xMnxGeC MAX phase thin films synthesized by magnetron sputtering technique, were studied. It was found that the Cr:Ge:C atomic ratios most likely play the main role in the formation of a thin film of the MAX phase. A slight excess of carbon and manganese doping significantly improved the phase composition of the films. Cr2GeC films with a thicknesses exceeding 40 nm consisted of crystallites with well-developed facets, exhibiting metallic optical and transport properties. The hopping conduction observed in the Cr2-xMnxGeC film could be attributed to the columnar form of crystallites. Calculations based on a two-band model indicated high carrier concentrations N, P and mobility μ in the best-synthesized Cr2GeC film, suggesting transport properties close to single crystal material. The findings of this study can be utilized to enhance the growth technology of MAX phase thin films. [ABSTRACT FROM AUTHOR]

Published
2023
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29. LRPD: Large Replay Parallel Dataset

Author

Yakovlev, Ivan, primary, Melnikov, Mikhail, additional, Bukhal, Nikita, additional, Makarov, Rostislav, additional, Alenin, Alexander, additional, Torgashov, Nikita, additional, and Okhotnikov, Anton, additional

Published
2022
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30. Asymmetric interfaces in epitaxial off-stoichiometric Fe₃₊ₓ Si₁−ₓ /Ge/Fe₃₊ₓ Si₁−ₓ hybrid structures : Effect on magnetic and electric transport properties

Author

Tarasov, Anton S., Tarasov, Ivan A., Yakovlev, Ivan A., Rautskii, Mikhail V., Bondarev, Ilya A., Lukyanenko, Anna V., Platunov, Mikhail S., Volochaev, Mikhail N., Efimov, Dmitriy D., Goikhman, Aleksandr Yu., Belyaev, Boris A., Baron, Filipp A., Shanidze, Lev V., Farle, Michael, Varnakov, Sergey N., Ovchinnikov, Sergei G., and Volkov, Nikita V.

Subjects
Physik (inkl. Astronomie)
Abstract

Three-layer iron-rich Fe₃₊ₓ Si₁−ₓ /Ge/Fe₃₊ₓ Si₁−ₓ (0.2 < x < 0.64) heterostructures on a Si(111) surface with Ge thicknesses of 4 nm and 7 nm were grown by molecular beam epitaxy. Systematic studies of the structural and morphological properties of the synthesized samples have shown that an increase in the Ge thickness causes a prolonged atomic diffusion through the interfaces, which significantly increases the lattice misfits in the Ge/Fe₃₊ₓ Si₁−ₓ heterosystem due to the incorporation of Ge atoms into the Fe₃₊ₓ Si₁−ₓ bottom layer. The resultant lowering of the total free energy caused by the development of the surface roughness results in a transition from an epitaxial to a polycrystalline growth of the upper Fe₃₊ₓ Si₁−ₓ. The average lattice distortion and residual stress of the upper Fe₃₊ₓ Si₁−ₓ were determined by electron diffraction and theoretical calculations to be equivalent to 0.2 GPa for the upper epitaxial layer with a volume misfit of −0.63% compared with a undistorted counterpart. The volume misfit follows the resultant interatomic misfit of |0.42|% with the bottom Ge layer, independently determined by atomic force microscopy. The variation in structural order and morphology significantly changes the magnetic properties of the upper Fe₃₊ₓ Si₁−ₓ layer and leads to a subtle effect on the transport properties of the Ge layer. Both hysteresis loops and FMR spectra differ for the structures with 4 nm and 7 nm Ge layers. The FMR spectra exhibit two distinct absorption lines corresponding to two layers of ferromagnetic Fe₃₊ₓ Si₁−ₓ films. At the same time, a third FMR line appears in the sample with the thicker Ge. The angular dependences of the resonance field of the FMR spectra measured in the plane of the film have a pronounced easy-axis type anisotropy, as well as an anisotropy corresponding to the cubic crystal symmetry of Fe₃₊ₓ Si₁−ₓ, which implies the epitaxial orientation relationship of Fe₃₊ₓ Si₁−ₓ (111)[0−11] || Ge(111)[1−10] || Fe₃₊ₓ Si₁−ₓ (111)[0−11] || Si(111)[1−10]. Calculated from ferromagnetic resonance (FMR) data saturation magnetization exceeds 1000 kA/m. The temperature dependence of the electrical resistivity of a Ge layer with thicknesses of 4 nm and 7 nm is of semiconducting type, which is, however, determined by different transport mechanisms. CA extern

Published
2022

31. Effect of chemical ordering on optical properties of Fe3Si epitaxial films

Author

Tarasov Ivan, Popov Zakhar, Visotin Maxim, Yakovlev Ivan, and Varnakov Sergey

Subjects
Physics, QC1-999
Abstract

Optical characteristics (electron energy loss function, optical conductivity σ, permittivity ε, refractive index n, extinction coefficient k, and absorption coefficient α) of a 30 nm thick epitaxial Fe3Si iron silicide films grown at different silicon substrate temperature (26, 100, 200, 300 ˚C) were determined within E = 0.74–6.46 eV photon energy range using spectroscopic ellipsometry technique. The experimental data are compared to the optical characteristics calculated in the framework of the density functional theory using the GGA–PBE approximation. Variations of the optical characteristics spectra are discussed from the point of view of chemical ordering of DO3 type crystal structure. It is asserted that the electron energy-loss function, optical conductivity and extinction coefficient of the Fe3Si iron silicide films undergo noticeable changes in different spectral ranges over the whole spectrum between 0.74 and 6.46 eV due to variation in the chemical order. Information on the effect of chemical ordering on the optical properties obtained here allows one to carry out quick qualitative analysis of Fe3Si film crystal quality during the synthesis procedures by ellipsometry method in situ.

Published
2018
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35. Asymmetric Interfaces in Epitaxial Off-Stoichiometric Fe3+xSi1−x/Ge/Fe3+xSi1−x Hybrid Structures: Effect on Magnetic and Electric Transport Properties

Author

Tarasov, Anton S., primary, Tarasov, Ivan A., additional, Yakovlev, Ivan A., additional, Rautskii, Mikhail V., additional, Bondarev, Ilya A., additional, Lukyanenko, Anna V., additional, Platunov, Mikhail S., additional, Volochaev, Mikhail N., additional, Efimov, Dmitriy D., additional, Goikhman, Aleksandr Yu., additional, Belyaev, Boris A., additional, Baron, Filipp A., additional, Shanidze, Lev V., additional, Farle, Michael, additional, Varnakov, Sergey N., additional, Ovchinnikov, Sergei G., additional, and Volkov, Nikita V., additional

Published
2021
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36. Sublayer-Enhanced Growth of Highly Ordered Mn 5 Ge 3 Thin Film on Si(111).

Author

Yakovlev, Ivan, Tarasov, Ivan, Lukyanenko, Anna, Rautskii, Mikhail, Solovyov, Leonid, Sukhachev, Alexander, Volochaev, Mikhail, Efimov, Dmitriy, Goikhman, Aleksandr, Bondarev, Ilya, Varnakov, Sergey, Ovchinnikov, Sergei, Volkov, Nikita, and Tarasov, Anton

Subjects
*GERMANIUM films, *THIN films, *BUFFER layers, *DIFFUSION barriers, *LATTICE constants, *MAGNETIC properties, *NANOWIRES
Abstract

Mn5Ge3 epitaxial thin films previously grown mainly on Ge substrate have been synthesized on Si(111) using the co-deposition of Mn and Ge at a temperature of 390 °C. RMS roughness decreases by almost a factor of two in the transition from a completely polycrystalline to a highly ordered growth mode. This mode has been stabilized by changing the ratio of the Mn and Ge evaporation rate from the stoichiometric in the buffer layer. Highly ordered Mn5Ge3 film has two azimuthal crystallite orientations, namely Mn5Ge3 (001) [1-10] and Mn5Ge3 (001) [010] matching Si(111)[-110]. Lattice parameters derived a (7.112(1) Å) and c (5.027(1) Å) are close to the bulk values. Considering all structural data, we proposed a double buffer layer model suggesting that all layers have identical crystal structure with P6₃/mcm symmetry similar to Mn5Ge3, but orientation and level of Si concentration are different, which eliminates 8% lattice mismatch between Si and Mn5Ge3 film. Mn5Ge3 film on Si(111) demonstrates no difference in magnetic properties compared to other reported films. TC is about 300 K, which implies no significant excess of Mn or Si doping. It means that the buffer layer not only serves as a platform for the growth of the relaxed Mn5Ge3 film, but is also a good diffusion barrier. [ABSTRACT FROM AUTHOR]

Published
2022
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40. Adaptive acousto-optic technique for femtosecond laser pulse shaping

Author

Molchanov, Vladimir Ya., Chizhikov, Sergey I., Makarov, Oleg Yu., Solodovnikov, Nikolay P., Ginzburg, Vladislav N., Katin, Evgeniy V., Khazanov, Efim A., Lozhkarev, Vladimir V., and Yakovlev, Ivan V.

Subjects
Beamforming -- Methods, Optics, Adaptive -- Research, Acoustooptics -- Research, Laser pulses, Ultrashort -- Properties, Light filters -- Properties, Light filters -- Usage, Optics, Geometrical -- Research, Astronomy, Physics
Abstract

We discuss the theoretical and experimental investigation of acousto-optic dispersive tunable filters, based on quasi-collinear geometry of light-sound interaction in a tellurium dioxide single crystal. The geometry uses the effect of strong acoustic anisotropy in the paratellurite as well as peculiarities of acoustic wave reflections at the free boundary of the crystal. A mathematical concept for determination of optical, electrical, and constructional parameters of the filters is developed. Different experimental acousto-optic filters intended for femtosecond pulse shaping are designed and tested. Preliminary experiments are performed in a subpetawatt optical parametric chirped pulse amplification laser system. The experimental data conform completely with the predicted data. OCIS codes: 230.1040, 140.7090, 190.4970.

Published
2009

47. The First for Russian Oil Company State of Art Intelligent Completion System Real Time Cleanup Monitoring and Optimization for 3 ERD wells in Caspian Offshore

Author

Golenkin, Mikhail Yur'evich, additional, Biakov, Aleksandr Petrovich, additional, Eliseev, Denis Vladimirovich, additional, Zavyalov, Aleksandr Aleksandrovich, additional, Zhirkina, Anna Andreevna, additional, Pico, Yamid Lopez, additional, Shapovalov, Alexey Petrovich, additional, Bulygin, Igor Aleksandrovich, additional, and Yakovlev, Ivan Mikhailovich, additional

Published
2020
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48. Fivefold compression of 250-TW laser pulses

Author

Ginzburg, Vladislav, primary, Yakovlev, Ivan, additional, Zuev, Alexandr, additional, Korobeynikova, Anastasia, additional, Kochetkov, Anton, additional, Kuzmin, Alexey, additional, Mironov, Sergey, additional, Shaykin, Andrey, additional, Shaikin, Ilya, additional, Khazanov, Efim, additional, and Mourou, Gerard, additional

Published
2020
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50. Two-Stage Nonlinear Compression of High Intensity Pulses

Author

Ginzburg, Vladislav, primary, Yakovlev, Ivan, additional, Zuev, Alexandr, additional, Korobeynikova, Anastasia, additional, Kochetkov, Anton, additional, Kuzmin, Alexey, additional, Mironov, Sergey, additional, Shaykin, Andrey, additional, Shaikin, Ilya, additional, and Khazanov, Efim, additional

Published
2020
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