Dr. Vladimir L. Komolov Profile

Dr. Vladimir L. Komolov

at National Research Univ of ITMO

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Author

Publications (15)

Proceedings Article | 16 November 2018 Open Access

Early laser damage research at State Optical Institute in Leningrad

Leonid Glebov, Vladimir Komolov

Proceedings Volume 10805, 1080506 (2018) https://doi.org/10.1117/12.2502569

KEYWORDS: Laser induced damage, Glasses, Dielectrics, Metals, Optics manufacturing, Laser damage threshold, Absorption, Pulsed laser operation, High power lasers, Opacity

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SPIE Journal Paper | 10 October 2012

Dynamics of laser-induced damage of spherical nanoparticles by high-intensity ultrashort laser pulses

Vladimir Komolov, Vitaly Gruzdev, Sergey Przhibelskii, Dmitry Smirnov

OE, Vol. 51, Issue 12, 121816, (October 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.12.121816

KEYWORDS: Nanoparticles, Ions, Laser induced damage, Ionization, Spherical lenses, Chemical species, Ultrafast phenomena, Particles, Pulsed laser operation, Atmospheric particles

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Proceedings Article | 28 February 2011 Paper

Photo-ionization and modification of nanoparticles on transparent substrates by ultrashort laser pulses

Vitaly Gruzdev, Vladimir Komolov, Hao Li, Qingsong Yu, Sergey Przhibel'skii, Dmitry Smirnov

Proceedings Volume 7996, 79960J (2011) https://doi.org/10.1117/12.887181

KEYWORDS: Nanoparticles, Gold, Ions, Laser ablation, Particles, Femtosecond phenomena, Silica, Glasses, Atmospheric particles, Pulsed laser operation

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The objective of this combined experimental and theoretical research is to study the dynamics and mechanisms of nanoparticle interaction with ultrashort laser pulses and related modifications of substrate surface. For the experimental effort, metal (gold), dielectric (SiO2) and dielectric with metal coating (about 30 nm thick) spherical nanoparticles deposited on glass substrate are utilized. Size of the particles varies from 20 to 200 nm. Density of the particles varies from low (mean inter-particle distance 100 nm) to high (mean inter-particle distance less than 1 nm). The nanoparticle assemblies and the corresponding empty substrate surfaces are irradiated with single 130-fs laser pulses at wavelength 775 nm and different levels of laser fluence. Large diameter of laser spot (0.5-2 mm) provides gradient variations of laser intensity over the spot and allows observing different laser-nanoparticle interactions. The interactions vary from total removal of the nanoparticles in the center of laser spot to gentle modification of their size and shape and totally non-destructive interaction. The removed particles frequently form specific sub-micrometer-size pits on the substrate surface at their locations. The experimental effort is supported by simulations of the nanoparticle interactions with high-intensity ultrashort laser pulse. The simulation employs specific modification of the molecular dynamics approach applied to model the processes of non-thermal particle ablation following laser-induced electron emission. This technique delivers various characteristics of the ablation plume from a single nanoparticle including energy and speed distribution of emitted ions, variations of particle size and overall dynamics of its ablation. The considered geometry includes single isolated particle as well a single particle on a flat substrate that corresponds to the experimental conditions. The simulations confirm existence of the different regimes of laser-nanoparticle interactions depending on laser intensity and wavelength. In particular, implantation of ions departing from the nanoparticles towards the substrate is predicted.

Proceedings Article | 7 January 2009 Paper

Laser damage of transparent dielectrics ionized by intensive ultrashort pulses

V. Komolov, S. Przhibel'skii

Proceedings Volume 7132, 713207 (2009) https://doi.org/10.1117/12.804135

KEYWORDS: Ions, Solids, Nanoparticles, Ionization, Particles, Dielectrics, Ultrafast phenomena, Laser induced damage, Crystals, Scattering

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Proceedings Article | 25 January 2007 Paper

Destruction of the nano-size solid particles under femtosecond laser pulse action

Vitaly Gruzdev, Vladimir Komolov, Sergey Przhibel'skii, Dmitry Smirnov

Proceedings Volume 6596, 65960P (2007) https://doi.org/10.1117/12.726412

KEYWORDS: Ions, Nanoparticles, Particles, Ionization, Solids, Electrons, Scattering, Femtosecond phenomena, Motion analysis, Laser induced damage

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Proceedings Article | 22 May 2006 Paper

Dynamics of spreading of a spherical particle ionized by intense ultra-short laser pulse

V. Gruzdev, V. Komolov, S. Przhibel'skii, D. Smirnov

Proceedings Volume 6256, 625603 (2006) https://doi.org/10.1117/12.679706

KEYWORDS: Ions, Particles, Ionization, Solids, Crystals, Pulsed laser operation, Optical spheres, Atmospheric particles, Spherical lenses, Numerical modeling

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Proceedings Article | 21 February 2005 Paper

Laser-induced damage of transparent solids by femtosecond laser pulses

Vitali Gruzdev, Vladimir Komolov

Proceedings Volume 5647, (2005) https://doi.org/10.1117/12.585170

KEYWORDS: Laser induced damage, Ions, Solids, Pulsed laser operation, Femtosecond phenomena, Ionization, Absorption, Laser ablation, Phonons, Mechanics

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Our paper is devoted to theoretical analysis of mechanisms of laser-induced dmaage of transparent solids by femtosecond laser pulses in single-shot regime. The duration of the pulses is so small that the phonon sub-system practically does not take part in the processes occurring during the direct action of laser pulse. It means that the process of direct damage starts with a certain delay after the laser pulse. We have come to conclusion that it is reasonable to separate out three main stages of the process of macroscopic damage: 1) the direct laser-solid interaction during pulse action including mulitphoton absorption, excitation of the electron subsystem near the material surface and fast leaving of the irradiated area by electrons (e.g., through photoelectron emission); 2) fast after-action including breaking of electrical neutrality in thin near-surface layer and acceleration of ions; 3) slow or delayed after-action including moving of fast ions into bulk accompanied by heating up of the material through collisions resulting in macroscopic thermal damage. In this presentation we focus on the first two stages, i.e., excitation of the electron sub-system, electron emission and development of electrostatic instability often referred to as Coulomb explosion. Estimations performed on the basis of the Keldysh formula show possibility to reach extremely high density of electrons in conduction band (up to 50% of total number of valence electrons) at laser intensity slightly above 10 TW per sq. cm. The electrons can leave the irradiated area before the laser pulse ends. We utilize Keldysh formula to estimate the total number of electrons lost through emission and show the number to be high enough for significant breaking of electrical neutrality and fomration of relatively large positive charge localized in the irradiated area. Assuming the multiphoton ionization to give the dominant contribution to absorption, we estimate the total number of electrons lost through emission and show the number to be high enough for significant breaking of electrical neutrality and formation of relatively large positive charge localized in the irradiated area. Assuming the mulitphoton ionization to give the dominant contribution to absorption, we estimate the characteristic thickness of the ionized layer and show the positive charge to be localized in the layer which is approximately 1 micrometer thick. Then we estimate velocities and energies of ions accelerated by the laser-induced charge and show possibility of appearing ions with MeV energies. The penetration depth characteristic of those ions is an order of 10 micrometers what implies possibility of heating and thermal damage of the material with formation of deep craters.

Proceedings Article | 15 July 2004 Paper

Possible physical mechanisms of large-scale heating of nonmetal crystals by femtosecond laser pulses

Vitali Gruzdev, Vladimir Komolov

Proceedings Volume 5506, (2004) https://doi.org/10.1117/12.579987

KEYWORDS: Ions, Crystals, Laser crystals, Femtosecond phenomena, Semiconductors, Pulsed laser operation, Semiconductor lasers, Dielectrics, Ionization, Solids

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Proceedings Article | 15 July 2004 Paper

Absorption saturation in semiconductors under local irradiation by short light pulses

Larisa Amosova, Igor Didenko, Vladimir Komolov

Proceedings Volume 5506, (2004) https://doi.org/10.1117/12.580001

KEYWORDS: Absorption, Semiconductors, Electrons, Neodymium, Diffusion, Semiconductor lasers, Near field optics, Pulsed laser operation, Optoelectronics, Information operations

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Proceedings Article | 15 July 2004 Paper

Laser-induced effects in nonhomogeneous high-scattering media

Vladimir Komolov, Alexey Kulikov, Sergey Przhibel'skii, Valentin Smirnov

Proceedings Volume 5506, (2004) https://doi.org/10.1117/12.580014

KEYWORDS: Capillaries, Light scattering, Scattering, Transparency, Homogenization, Solids, Mass attenuation coefficient, Temperature metrology, Liquids, Glasses

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Proceedings Article | 26 June 2001 Paper

Laser-induced homogenization of light-diffusing media

Vladimir Komolov, Sergey Przhibilskii, Valentin Smirnov

Proceedings Volume 4423, (2001) https://doi.org/10.1117/12.431211

KEYWORDS: Light scattering, Scattering, Homogenization, Solids, Beam propagation method, Absorption, Mass attenuation coefficient, Laser scattering, Diffusion, Polymers

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Proceedings Article | 8 March 2001 Paper

Photocurrent amplification in Schottky diodes

Larisa Amosova, Vladimir Komolov

Proceedings Volume 4318, (2001) https://doi.org/10.1117/12.417605

KEYWORDS: Diodes, Semiconductors, Estimation theory

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Proceedings Article | 19 July 1999 Paper

Laser-induced instabilities in optical materials induced by low-absorbing microinclusion and laser-induced damage

Mikhail Libenson, Anastasia Gruzdeva, Vitali Gruzdev, Vladimir Komolov

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.355054

KEYWORDS: Laser induced damage, Absorption, Laser development, Refraction, Positive feedback, Laser optics, Laser damage threshold, Semiconductors, Refractive index, Bistability

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Proceedings Article | 7 April 1999 Paper

Laser-induced instability in transparent materials induced by low-absorbing microinclusion

Anastasia Gruzdeva, Vitali Gruzdev, Vladimir Komolov, Mikhail Libenson

Proceedings Volume 3578, (1999) https://doi.org/10.1117/12.344441

KEYWORDS: Absorption, Laser induced damage, Refraction, Laser damage threshold, Semiconductors, Positive feedback, Laser development, Refractive index, Optical spheres, Thermal modeling

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Proceedings Article | 4 April 1997 Paper

Electrothermal defect generation and optical damage in a transparent medium

Vladimir Komolov

Proceedings Volume 3093, (1997) https://doi.org/10.1117/12.271659

KEYWORDS: Absorption, Optical damage, Solids, Crystals, Semiconductors, Thermal modeling, Positive feedback, Laser damage threshold, Laser induced damage, Semiconductor lasers

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Showing 5 of 15 publications

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