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High-brightness all-fiber Raman lasers directly pumped by multimode laser diodes

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High Power Laser Science and Engineering 2019年第1期7卷 107-113页

作者： S.A.Babin institute of automation and electrometry SB RAS Novosibirsk State University

High-brightness fiber laser sources usually utilize active rare-earth-doped fibers cladding-pumped by multimode laser diodes(LDs), but they operate in limited wavelength ranges. Singlemode-passive-fiber based Raman lasers are able to operate at almost any wavelength being pumped by high-power fiber lasers. One of the interesting possibilities is to directly pump graded-index(GRIN) multimode passive fibers by available high-power multimode LDs at 915–940 nm,thus achieving high-power Raman lasing in the wavelength range of 950–1000 nm, which is problematic for rare-earthdoped fiber lasers. Here we review the latest results on the development of all-fiber high-brightness LD-pumped sources based on GRIN fiber with in-fiber Bragg gratings(FBGs). The mode-selection properties of FBGs inscribed by fs pulses supported by the Raman clean-up effect result in efficient conversion of multimode pump into a high-quality output beam at 9 xx nm. GRIN fibers with core diameters 62.5, 85 and 100 μm are compared. Further scaling capabilities and potential applications of such sources are discussed.

关键词： beam cleaning fiber laser high brightness laser diode pumping Raman laser

Advances in femtosecond laser direct writing of fiber Bragg gratings in multicore fibers:technology,sensor and laser applications

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Opto-Electronic Advances 2022年第4期5卷 48-68页

作者： Alexey Wolf Alexander Dostovalov Kirill Bronnikov Mikhail Skvortsov Stefan Wabnitz Sergey Babin Novosibirsk State University Novosibirsk 630090Russia institute of automation and electrometry of the sb ras Novosibirsk 630090Russia Department of Information Electronics and Telecommunications EngineeringSapienza University of RomeRome 00184Italy

In this article,we review recent advances in the technology of writing fiber Bragg gratings(FBGs)in selected cores of multicore fibers(MCFs)by using femtosecond laser *** writing technology of such a key element as the FBG opens up wide opportunities for the creation of next generation fiber lasers and sensors based on *** advantages of the technology are shown by using the examples of 3D shape sensors,acoustic emission sensors with spatially multiplexed channels,as well as multicore fiber Raman lasers.

关键词： multicore fiber fiber Bragg grating femtosecond laser micromachining fiber laser fiber sensor

Novel performance of fiber lasers:tunable operation in visible range

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Frontiers of Optoelectronics 2010年第1期3卷 33-37页

作者： S.A.BABIN institute of automation and electrometry Inversion Fiber Co.Ltd.

A review of the main physical processes important for frequency doubling of fiber lasers and the results of development by the Novosibirsk group of the fiber lasers operating from blue-green to yellow-red spectral ranges with a potential of the broad continuous tuning are presented. These lasers with ～100 mW power are treated to be attractive light sources for applications in medicine, especially in confocal microscopy and flow cytometry.

关键词： fiber laser tunable operation Raman fiber lasers (RFLs) frequency tuning frequency doubling

Physics and applications of charged domain walls

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npj Computational Materials 2018年第1期4卷 119-129页

作者： Petr S.Bednyakov Boris I.Sturman Tomas Sluka Alexander K.Tagantsev Petr V.Yudin institute of Physics Czech Academy of SciencesNa Slovance 218221 Prague 8Czech Republic institute of automation and electrometry sb ras Koptyug ave.1Novosibirsk 630090Russia CREAL3D SA Chemin du Paqueret 1 ACH-1025 Saint-SulpiceSwitzerland Swiss Federal institute of Technology(EPFL) CH-1015 LausanneSwitzerland Ioffe institute 194021 St.PetersburgRussia

The charged domain wall is an ultrathin(typically nanosized)interface between two domains;it carries bound charge owing to a change of normal component of spontaneous polarization on crossing the *** contrast to hetero-interfaces between different materials,charged domain walls(CDWs)can be created,displaced,erased,and recreated again in the bulk of a *** of the bound charge with free carriers is often necessary for stability of CDWs,which can result in giant two-dimensional conductivity along the *** in nominally insulating ferroelectrics,the concentration of free carriers at the walls can approach metallic ***,CDWs can be viewed as ultrathin reconfigurable strongly conductive sheets embedded into the bulk of an insulating *** feature is highly attractive for future *** last decade was marked by a surge of research interest in *** resulted in numerous breakthroughs in controllable and reproducible fabrication of CDWs in different materials,in investigation of CDW properties and charge compensation mechanisms,in discovery of light-induced effects,and,finally,in detection of giant two-dimensional *** present review is aiming at a concise presentation of the main physical ideas behind CDWs and a brief overview of the most important theoretical and experimental findings in the field.

关键词： walls breakthrough nominal

Inter-correlation between Sunspot Oscillations and Their Internal Structures

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Research in Astronomy and Astrophysics 2022年第11期22卷 97-106页

作者： Libo Fu Zizhan Zhu Ding Yuan Jiaoyang Wang Song Feng Sergey Anfinogentov institute of Space Science and Applied Technology Harbin Institute of TechnologyShenzhen 518055China Faculty of Information Engineering and automation Kunming University of Science and TechnologyKunming 650500China institute of Solar-Terrestrial Physics sb ras Lermontov st.126a664033IrkutskRussia

Three-and five-minute oscillations are commonly observed in any *** they are modulated by the internal thermal and magnetic structures of a sunspot,they could be used as an effective tool for researching sunspot *** this paper,we investigate the properties of oscillations in sunspot groups with varying sizes and magnetic fields,and aim to establish the relationships between sunspot oscillations and its internal structure *** selected three groups of the unipolar sunspot with approximately axial-symmetric magnetic field and calculated their Fourier spectra based on the ultraviolet/extreme ultraviolet emission intensity variations recorded by the Solar Dynamics Observatory/Atmospheric Imaging *** found that the distribution of three-minute oscillation is defined by the joint effect of diverging magnetic field and the stratification of the sunspot *** distribution could be modified by any invading magnetic structures in the *** contrast,the five-minute oscillations are more prominent in small spots,implying that five-minute oscillation is very closely connected with umbral dynamics.

关键词： (Sun:)sunspots Sun:oscillations methods:data analysis

The effect of forced oscillations on the kinetics of wave drift in an inhomogeneous plasma

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Plasma Science and Technology 2020年第12期22卷 8-19页

作者： V I EROFEEV institute of automation&electrometry of the Siberian Branch of the Russian Academy of Sciences 1 Koptyug Prosp.630090NovosibirskRussia Novosibirsk State University 2 Pirogova Str.NovosibirskRussia

The kinetics is analyzed of the drift of non-potential plasma waves in spatial positions and wavevectors due to plasma's spatial inhomogeneity. The analysis is based on highly informative kinetic scenarios of the drift of electromagnetic waves in a cold ionized plasma in the absence of a magnetic field(Erofeev 2015 Phys. Plasmas 22 092302) and the drift of long Langmuir waves in a cold magnetized plasma(Erofeev 2019 J. Plasma Phys. 85 905850104). It is shown that the traditional concept of the wave kinetic equation does not account for the effects of the forced plasma oscillations that are excited when the waves propagate in an inhomogeneous *** are highlighted that account for these oscillations in the kinetic equations of the abovementioned highly informative wave drift scenarios.

关键词： informativeness of plasma kinetic scenario the ensemble method asymptotic convergence of perturbation theories correlation analysis of plasma kinetics kinetic equation of wave drift in phase space

Subharmonic mode locking of a Q-switched Nd:YAG laser

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Chinese Optics Letters 2023年第3期21卷 96-100页

作者： Alexey Gribanov Mikhail Yakovin Dmitry Yakovin Mikhail Mosin institute of automation and electrometry Siberian Branch of the Russian Academy of SciencesNovosibirsk 630090Russia

A Q-switched Nd:YAG laser has been actively mode-locked at a subharmonic frequency for the first time,to the authors’*** laser operation mode is provided by a combination of a traveling wave acousto-optic modulator and a spherical cavity *** dynamics of laser generation is *** with a duration of 70 ps and a peak power of about 10 MW were *** presented are new results on obtaining high-power[~60 kW]picosecond tunable radiation in the~620 nm region based on frequency conversion of a superluminescent parametric generator pumped by such a laser.

关键词： Nd:YAG laser diode pumping Q switching mode locking parametric light generators

Two-Capacitor Electrostatic Microgenerators

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Engineering（科研） 2013年第11期5卷 9-18页

作者： Igor L. Baginsky Edward G. Kostsov Victor F. Kamishlov institute of automation and electrometry Russian Academy of Sciences Novosibirsk Russia

All modes of operation of a two-capacitor generator based on overflow of the charge accumulated in capacitors through the load resistance between two capacitors with antiphase modulated capacitances by means of in-plane or out-of-plane shift of the electrode plates under action of a mechanical force are analyzed paying the especial attention to fabrication of the generators with small sizes. Numerical solutions for all the modes are obtained, and they are found to be universal. Analytical estimates of the maximum power of the generator as a function of the capacitances modulation factor are derived. Experimental investigations of a two-capacitor rotational electric generator show that its characteristics are consistent with the analysis performed and that this analysis can be used to describe all specific features of operation of particular generators. Applications of the devices in micro-design for feeding the remote sensors are discussed.

关键词： Energy Harvesting Electrostatics Capacitance Generators High Power

Zone Plate Interferometer for Testing the Spherical Surfaces

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Zone Plate Interferometer for Testing the Spherical Surfaces