Mr. Alexsej O. Levchenko Profile

Alexsej O. Levchenko

Ph.D. Student at PN Lebedev Physical Institute

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Author

Publications (11)

Proceedings Article | 16 May 2013 Paper

Triggering and guiding of electric discharge by a train of sub-TW UV laser pulses

A. Ionin, S. Kudryashov, A. Levchenko, L. Seleznev, A. Shutov, D. Sinitsyn, I. Smetanin, E. Sunchugasheva, N. Ustinovsky, V. Zvorykin

Proceedings Volume 8796, 87961M (2013) https://doi.org/10.1117/12.2011304

KEYWORDS: Ultraviolet radiation, Pulsed laser operation, Plasma, Ultrafast phenomena, Electrons, Mirrors, Laser amplifiers, Oscilloscopes, Electrodes, Photodiodes

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Proceedings Article | 8 November 2012 Paper

Triggering and guiding electric discharge by a train of ultrashort UV pulses and a long UV pulse emitted by a hybrid Ti:Sapphire-KrF laser facility

Andrey Ionin, Sergej Kudryashov, Alexsej Levchenko, Leonid Seleznev, Aleksei Shutov, Dmitry Sinitsyn, Igor Smetanin, Nikolay Ustinovskiy, Vladimir Zvorykin

Proceedings Volume 8547, 85470G (2012) https://doi.org/10.1117/12.966423

KEYWORDS: Ultraviolet radiation, Pulsed laser operation, Plasma, Electrons, Mirrors, Ultrafast phenomena, Electrodes, Laser amplifiers, Oscilloscopes, Photodiodes

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Proceedings Article | 21 May 2010 Paper

Broadband amplification at Kr2F trimer transition for short-pulse high-power laser applications

Alexey Levchenko, Nikolai Ustinovskii, Vladimir Zvorykin

Proceedings Volume 7721, 77211H (2010) https://doi.org/10.1117/12.854593

KEYWORDS: Absorption, Molecules, Mirrors, Amplifiers, Luminescence, Ultrafast phenomena, Ultraviolet radiation, Glasses, X-rays, Argon

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Proceedings Article | 22 April 2009 Paper

Fluorescence and transient absorption spectra of excimer laser mixtures

A. Levchenko, N. Ustinovskii, V. Zvorykin

Proceedings Volume 7131, 71311A (2009) https://doi.org/10.1117/12.817515

KEYWORDS: Absorption, Krypton, Argon, Luminescence, Nitrogen, Neon, Ions, Copper, Gases, Excimer lasers

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Proceedings Article | 15 January 2008 Paper

Dynamics of shock waves generated in liquids by high-energy KrF laser

Vladimir Zvorykin, Laurent Berthe, Michael Boustie, Alexey Levchenko, Nikolai Ustinovskii

Proceedings Volume 6985, 69850R (2008) https://doi.org/10.1117/12.787132

KEYWORDS: Liquids, Pulsed laser operation, Interfaces, Plasma, Absorption, Acoustics, Opacity, Ultraviolet radiation, Laser beam diagnostics, Light wave propagation

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Proceedings Article | 26 April 2007 Paper

Fluorescence and transient absorption spectra of Ar/Kr/F2 mixtures excited by e-beam

V. Zvorykin, I. Kholin, A. Levchenko, A. Molchanov, N. Ustinovskii, D. Zayarnyi

Proceedings Volume 6346, 63462U (2007) https://doi.org/10.1117/12.739121

KEYWORDS: Absorption, Luminescence, Krypton, Molecules, Molecular lasers, Light sources, Monochromators, Mirrors, Resonators, Femtosecond phenomena

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Proceedings Article | 12 April 2007 Paper

Fluorine-resistant optics for high-energy KrF lasers

V. Zvorykin, R. Gaynutdinov, M. Isaev, A. Levchenko, S. Sagitov, P. Sergeev, D. Stavrovskii, N. Ustinovskii

Proceedings Volume 6611, 66110M (2007) https://doi.org/10.1117/12.740723

KEYWORDS: Magnesium fluoride, Optical coatings, Fluorine, Absorption, Water, Etching, Laser therapeutics, Silica, Light scattering, Atomic force microscopy

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Proceedings Article | 9 June 2006 Paper

E-beam pumping and energy extraction from large-aperture KrF amplifiers

V. Zvorykin, S. Arlantsev, V. Bakaev, A. Levchenko, A. Molchanov, N. Ustinovskii

Proceedings Volume 6053, 605309 (2006) https://doi.org/10.1117/12.660056

KEYWORDS: Amplifiers, Absorption, Diodes, Optical amplifiers, Mirrors, Numerical simulations, Laser resonators, Argon, Information operations, Optical simulations

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Proceedings Article | 9 June 2006 Paper

Development and evaluation of fluorine-resistant coatings for windows of high-energy KrF laser

V. Zvorykin, V. Bakaev, R. Gaynutdinov, A. Levchenko, S. Sagitov, P. Sergeev, D. Stavrovskii, N. Ustinovskii

Proceedings Volume 6053, 60530M (2006) https://doi.org/10.1117/12.660321

KEYWORDS: Magnesium fluoride, Fluorine, Absorption, Laser damage threshold, Optical coatings, Light scattering, Atomic force microscopy, Ultraviolet radiation, Silica, Sputter deposition

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Proceedings Article | 23 March 2005 Paper

Amplified spontaneous emission and nanosecond pulse amplification in large-aperture electron-beam-pumped KrF amplifiers

Vladimir Zvorykin, Valerii Bakaev, A. Levchenko, A. Molchanov, N. Ustinovskii

Proceedings Volume 5777, (2005) https://doi.org/10.1117/12.611114

KEYWORDS: Amplifiers, Absorption, Optical amplifiers, Numerical simulations, Fusion energy, Energy efficiency, Mirrors, Oscillators, Laser energy, Argon

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Proceedings Article | 20 September 2004 Paper

High-energy GARPUN KrF laser interaction with solid and thin-foil targets in ambient air

Vladimir Zvorykin, Valerii Bakaev, Dimitri Batani, Ivan Lebo, A. Levchenko, Gleb Sychugov, Vladimir Tishkin, D. Zayarnyi

Proceedings Volume 5448, (2004) https://doi.org/10.1117/12.547442

KEYWORDS: Plasma, Solids, Pulsed laser operation, Ionization, Interfaces, Thin films, Absorption, Iron, Argon, Numerical simulations

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Hydrodynamic regimes of KrF laser interaction with solid and thin-film targets in atmospheric and reduced pressure air were investigated at high-energy GARPUN installation. These experiments were performed with 100-J, 100-ns laser pulses in planar focusing geometry and compared with numerical simulations with ATLANT code to verify the concept of laser-driven shock tube (LST), which could accelerate a gas to hypersonic velocity and produce strong shock waves (SW). Laser beam was focused by a prism raster optical system that provided very uniform intensity distribution at moderate laser intensities q ≤ 1 GW/cm² over a square spot of ~ 1-cm size. Dynamics of laser-produced plasma and SW in a surrounding gas were investigated by means of high-speed photo-chronograph and streak camera in combination with shadow or schlieren techniques, time and space resolved spectroscopy in a visible spectral range. Both experiments and simulations confirmed that target evaporation and blow-up of expanding plasma are the main mechanisms of UV laser-target interaction in a surrounding gas. Planar shock waves with velocities up to 7 km/s towards the laser beam were observed in a normal density air and up to 30 km/s in a rarefied air. Acceleration of thin CH films of 1 to 50-μm thickness was investigated both in a free-expansion and plasma-confined regimes with the highest achieved velocities up to 4 km/s. The SW damping law in a free space independently on laser intensity and air pressure could be approximated by a power law x ~ tⁿ with a power indexes n₁ = 0.85 - 0.95 at the initial stage and n₂ = 0.5 - 0.6 later, when a distance of the SW front from a target became comparable with a size of the irradiated spot. Instability growth at contact interfaces between ablative plasma and accelerated film, as well as between plasma and compressed air were observed and compared for various initial irradiation non-uniformities. They were introduced by a grid, which was set in front of the film target.

Showing 5 of 11 publications

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