Dr. Vladimir N. Tokarev Profile

Dr. Vladimir N. Tokarev

at Institute of General Physics

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Publications (6)

Proceedings Article | 9 March 2021 Presentation

Laser drilling a highly porous aluminosilicate ceramics

Igor Melnikov, Yakov Fironov, Vladimir Tokarev, Evgenii Nadezhdin

Proceedings Volume 11679, 116790F (2021) https://doi.org/10.1117/12.2583080

KEYWORDS: Ceramics, Laser drilling, Liquids, Laser ablation, Glasses, Composites, Optical filters, Metals, Gases, Foam

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Proceedings Article | 7 June 2006 Paper

Different regimes of viscous melt flow in laser ablation: from clean ablation to nanostructuring

Sylvain Lazare, Alexander Kaplan, Vladimir Tokarev

Proceedings Volume 6261, 626109 (2006) https://doi.org/10.1117/12.669515

KEYWORDS: Laser ablation, Polymers, Absorption, Liquids, Polymethylmethacrylate, Ceramics, Pulsed laser operation, Foam, Nanostructuring, Excimer lasers

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Proceedings Article | 22 December 1998 Paper

Pulsed laser deposition of thin film materials in vacuum and in ambient gas conditions

Frederic Grangeon, Tatiana Itina, H. Sassoli, Laetitia Lambert, Michel Autric, Vladimir Tokarev, Yves Mathey, Vladimir Marine

Proceedings Volume 3574, (1998) https://doi.org/10.1117/12.334465

KEYWORDS: Particles, Chemical species, Molecules, Chemical reactions, Thin films, Monte Carlo methods, Tellurium, Pulsed laser deposition, Laser ablation, Helium

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Pulsed laser ablation has attracted great attention over the past few years as promising technique for depositing thin films. A large variety of successful experimental results were obtained in this field, including the growth of high- temperature superconducting films, ferroelectric films, oxides, semiconductors, diamonds, etc. One of the main advantages of this technology is the simplicity of the experimental set-up. In a common configuration, the laser- generated flux of particles is collected on a planar substrate positioned parallel to the irradiated surface. Several modifications, like simultaneous generation of two plumes from different targets (double ablation), were proposed. Different lasers (e.g. KrF with (lambda) equals 248 nm, Nd-YAG with (lambda) equals 532 nm, etc.) with energy density 2 - 10 J/cm² were used in the ablation experiments both in vacuum and into diluted ambient gas (pressure up to 750 mTorr). Monte Carlo simulation was found to be a successful technique for theoretical investigations of the laser ablation processes. This method has allowed us to investigate the influence of elastic collisions and chemical reactions in the laser ablated plume on the angular characteristics of the flow. The results of the simulation show that elastic collisions give rise to focusing of particles towards the surface normal and to the redirection of the velocities of the more energetic particles in the direction close to the surface normal. The chemical reactions are found to influence the angular distributions in the way opposite to the one of elastic collisions. The reaction heat contributes to the energy of particles and the velocity distributions are affected by reactions. As result of these processes, the angular distributions are broadened from the surface normal. Additional collisions with the particles of the ambient gas were shown to influence the composition and uniformity of thin films. The study of these processes is of a particular interest for the developing of pulsed laser deposition (PLD) technique.

Proceedings Article | 4 April 1997 Paper

Experimental study of temperature dependence of reflectivity and heat capacity of steels and alloys at continuous wave Nd:YAG laser heating

Vladimir Tokarev, Olga Tsarkova, Vitali Konov, Friedrich Dausinger, Serge Garnov, Alexander Silenok

Proceedings Volume 3093, (1997) https://doi.org/10.1117/12.271672

KEYWORDS: Temperature metrology, Reflectivity, Continuous wave operation, Iron, Nd:YAG lasers, Pyrometry, Statistical analysis, Information operations, Laser irradiation, Oxidation

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Proceedings Article | 7 July 1993 Paper

Surface stability under pulsed laser ablation

Vladimir Tokarev, Vitali Konov

Proceedings Volume 1882, (1993) https://doi.org/10.1117/12.147683

KEYWORDS: Laser ablation, Natural surfaces, Excimer lasers, Pulsed laser operation, Laser stabilization, Erbium lasers, Laser processing, Liquids, Laser cutting, Polymers

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