Search

Your search keyword '"Potemkin F"' showing total 189 results
Start Over Author "Potemkin F"
189 results on '"Potemkin F"'

6. Laser-Synchrotron Facility of the National Research Centre “Kurchatov Institute”

Author

Kovalchuk, M. V., Borisov, M. M., Garmatina, A. A., Gordienko, V. M., Zheltikov, A. M., Kvardakov, V. V., Korchuganov, V. N., Likhachev, I. A., Mareev, E. I., Mitrofanov, A. V., Nazarov, M. M., Pashaev, E. M., Potemkin, F. V., Romanovskii, Ya. O., Rudneva, E. B., Sidorov-Biryukov, D. A., Subbotin, I. A., Chashchin, M. V., Shcheglov, P. A., and Panchenko, V. Ya.

Published
2022
Full Text
View/download PDF

7. Compact highly efficient 2.1-W continuous-wave mid-IR Fe:ZnSe coherent source pumped by Er:ZBLAN fiber laser

Author

Pushkin, A. V., Migal, E. A., Uehara, H., Goya, K., Tokita, S., Frolov, M. P., Korostelin, Yu. V., Kozlovsky, V. I., Skasyrsky, Ya. K., and Potemkin, F. V.

Subjects
Physics - Optics
Abstract

We report the compact and robust coherent source operating in mid-IR based on Fe:ZnSe chalcogenide gain medium optically pumped by Er:ZBLAN fiber laser. The output power of 2.1 W with 59% slope efficiency with respect to absorbed pump power at liquid nitrogen cooling is achieved. We show that strong re-absorption at high pump power and iron ion doping concentrations leads to the continuous tuning of central wavelength from 4012 to 4198 nm. Robustness of high power Er:ZBLAN fiber laser combined with prominent spectroscopic properties of Fe:ZnSe media pave the way for the development of reliable tunable CW mid-IR sources for scientific and industrial purposes.

Published
2018
Full Text
View/download PDF

12. Advances in the development of few-cycle gigawatt-peak-power mid-IR optical parametric amplifiers pumped by Cr:Forsterite laser using non-oxide nonlinear crystals.

Author

Suleimanova, D. Z., Migal, E. A., Badikov, D. V., and Potemkin, F. V.

Subjects
OPTICAL parametric amplifiers, LASER pumping, OPTICAL parametric oscillators, OPTICAL pumping, CRYSTALS, HARMONIC generation, ENERGY conversion
Abstract

We demonstrate an experimental and theoretical comparison of non-oxide LiGaS2, HgGa2S4, and AgGaS2 crystals performance for wavelength conversion into the near and mid-IR range 1.5–8 μm in optical parametric amplifier pumped by Cr:Forsterite laser, delivering 100 fs pulses at 1.24 μm. It is shown that exceptionally high total energy conversion efficiency into the idler (4–5 μm) and signal (1.65–1.8 μm) waves up to 18% can be achieved using the HGS crystal, providing high nonlinearity, while the LGS crystal is more preferable for generating few-cycle mid-IR pulses due its unique dispersive properties. Our source features high peak power in gigawatt regime (0.4–2.4 GW) with pulse duration below 80 fs and optical synchronization with high harmonic generation (HHG) and THz beamlines, which is ideal for pump-probe experiments of nonlinear and strong-field physics. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

13. Dynamics of multiple bubbles, excited by femtosecond filament in water: Role of aberrations

Author

Potemkin, F. V. and Mareev, E. I.

Subjects
Physics - Plasma Physics
Abstract

Using shadow photography, we observed microsecond time scale evolution of multiple cavitation bubbles, excited by tighty focused femtosecond laser pulse in water under supercritical power regime (~100 Pcr). In these extreme conditions high energy delivery into the microvolume of liquid sample leads to creation of single filament which becomes a source of cavitation region formation. When aberrations were added to the optical scheme the hot spots along the filament axis are formed. At high energies (more than 40uJ) filaments in these hot spots are fired and, as a result, complex pattern of cavitation bubbles is created. The bubbles can be isolated from each other or build exotic drop-shaped cavitation region, which evolution at the end of its life, before the final collapse, contains the jet emission. The dynamics of the cavitation pattern was investigated from pulse energy and focusing. We found that greater numerical aperture of the focusing optics leads to greater cavitation area length. The strong interaction between bubbles was also observed. This leads to a significant change of bubble evolution, which is not yet in accordance with Rayleigh model., Comment: 5 pages, 4 figures

Published
2014
Full Text
View/download PDF

14. Generation of spherical and cylindrical shock acoustic waves from optical breakdown in water, stimulated with femtosecond pulse

Author

Potemkin, F. V., Mareev, E. I., Podshivalov, A. A., and Gordienko, V. M.

Subjects
Physics - Plasma Physics, Physics - Fluid Dynamics
Abstract

Using shadow photography technique we have observed shock acoustic wave from optical breakdown, excited in water by tightly focused Cr:Forsterite femtosecond laser beam, and have found two different regimes of shock wave generation by varying only the energy of laser pulse. At low energies a single spherical shock wave is generated from laser beam waist, and its radius tends to saturation with energy increasing. At higher energies long laser filament in water is fired, that leads to the cylindrical shock wave generation, which longitude increases logarithmically with laser pulse energy. From shadow pictures we estimated maximal velocity in front or shock wave of 2300+/-150m/s and pressure of 1.0+/-0.1 GPa

Published
2014

31. Optical Harmonics Generation under the Interaction of Intense (up to 1014 W/cm2) Mid-Infrared Femtosecond Laser Radiation of a Fe:ZnSe Laser System with a Dense Laminar Gas Jet.

Author

Rumiantsev, B. V., Mikheev, K. E., Pushkin, A. V., Migal, E. A., Stremoukhov, S. Yu., and Potemkin, F. V.

Subjects
LASER beams, HARMONIC generation, FEMTOSECOND lasers, ENERGY consumption, GASES, RADIATION
Abstract

Low-order (fifth, seventh, and ninth) harmonics have been generated under the interaction of intense (I ~ 1014 W/cm2) femtosecond mid-infrared radiation of a laser system based on a Fe:ZnSe crystal (wavelength is 4.55 μm, pulse duration by the FWHM level of intensity is 160 fs, and the pulse energy is up to 3.5 mJ) with an argon jet (pressure is up to 10 bar) in the tunneling ionization regime (Keldysh parameter is ). The maximum energy efficiencies of the 5th, 7th, and 9th harmonic generation are 2 × 10–7, 6 × 10‒9, and 3 × 10–10, respectively. It has been established that nonlinear effects of propagation of generating radiation under an increase in the pressure of the gas jet begin to significantly affect the process of generation. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

32. Generation and Application of X-ray Pulses on a Terawatt Laser System.

Author

Nazarov, M. M., Garmatina, A. A., Mitrofanov, A. V., Sidorov-Biryukov, D. A., Scheglov, P. A., Chashchin, M. V., Potemkin, F. V., Gordienko, V. M., Zheltikov, A. M., and Panchenko, V. Ya.

Subjects
PARTICLE acceleration, NUCLEAR fusion, LASER beams, X-rays, FEMTOSECOND lasers, LASER pulses, FEMTOSECOND pulses
Abstract

Currently, the Kurchatov Laser-Synchrotron Complex is conducting research on the interaction of powerful femtosecond laser radiation with matter. The purpose of these studies is to develop new techniques and approaches for the characterization of high-temperature plasma, X-rays and particle acceleration, which can be the basis for the work planned within the framework of the synchrotron-neutron project. Laser-driven X-ray production, electron acceleration, nuclear fusion, ultrafast structural dynamics of nanoparticles in intense laser fields remains an active research topic, aimed at generating advanced controllable sources. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results