Start of condensation in erosional jets of metals subjected to highly intense submicrosecond laser action

Goncharov, V. K.; Kozadaev, K. V.; Shchegrikovich, D. V.

doi:10.1007/s10891-011-0534-4

Cited by 8 publications

(17 citation statements)

References 7 publications

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“…To experimentally study the optical characteristics of laserproduced plasma (using the techniques of transverse laser probing [10,11] and laser-induced plasma spectroscopy [12]) in this work we employed a research complex, which comprised the means for monitoring the dynamics of the spectral, spatial, and phase structures of laser-produced plasma plumes (LPPs) of metals with a high temporal resolution.…”

Section: Methodsmentioning

confidence: 99%

Possibility of applying a hydrodynamic model to describe the laser erosion of metals irradiated by high-intensity nanosecond pulses

Kozadaev¹

2014

Quantum Electron.

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We report the results of experimental investigations of the production and development of plasma-vapour plumes upon irradiation of metal targets by nanosecond (10 -100 ns) pulses with a high (10 8 -10 10 W cm -2 ) power density under atmospheric conditions. The transition from a quasi-stationary thermal mechanism of metal erosion to an explosion hydrodynamic one takes place when the radiation power density increases from 10 8 to 10 9 W cm -2 . The resultant experimental information is extremely important for the laser deposition of metal nanostructures under atmospheric conditions, which is possible only for power densities of 10 8 -10 9 W cm -2 .

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Section: Methodsmentioning

confidence: 99%

Possibility of applying a hydrodynamic model to describe the laser erosion of metals irradiated by high-intensity nanosecond pulses

Kozadaev¹

2014

Quantum Electron.

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“…ELT expands in the direction of the external environment, consuming due to the inverse braking effect almost all the energy of the back of the front of the acting optical pulse and, consequently, significantly warms up. A typical propagation velocity of the plasma jet at the initial moment of its formation is 7-20 km/s depending on the material of the metal target [6].…”

Section: Methodsmentioning

confidence: 99%

“…As a general rule [6] with a single laser pulse of the high power density a sufficiently small number of particles is formed (total mass of particles in the condensed phase bearable during the single-pulse treatment is tens of micrograms, depending on the type of metal and treatment conditions). Therefore, to obtain a sufficiently concentrated colloidal solutions of metals it is advisable to use a sequence of laser pulses which can be implemented using modern laser technology in the frequency mode.…”

Section: Methodsmentioning

confidence: 99%

Investigation of Noble Metals Colloidal Systems Formed by Laser Synthesis at Air

Goncharov

Kozadaev

Shchehrykovich

2012

Advances in Optical Technologies

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The present work is dedicated to the development of formation and diagnostics methods of water colloids of noble metals (Au, Au, Pt). As anoble nanoparticles formation method, the laser synthesis at air conditions is proposed. By the implantation of noble nanoparticles into water media, the colloidal systems of noble metals can be obtained. For the aims of investigation of noble colloid parameters, the complex diagnostics method is used. Such approach deals with direct methods (scanning electron microscopy and the characteristic radiation registration) and indirect methods (absorption spectroscopy and extinction modeling by Mie theory).

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“…At a duration of the front of rise of the pulse intensity of 50 ns, the plasma formation is generated with a delay of 30-40 ns from the beginning of exposure, suggesting that the radiation of the entire, in practice, leading edge of the pulse reaches the target surface without hindrance [14]. This produces a plasma flame which, due to the inverse breaking effect, begins to actively absorb the energy of the trailing edge of the acting laser pulse, increasing its internal energy owing to this and rapidly propagating in the atmosphere.…”

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confidence: 99%

“…Once the intensity of the laser pulse has dropped, adiabatic expansion of the plasma continues, which leads to its gradual cooling. In the plasma cloud, there appear local density fluctuations which subsequently turn to solid particles of the target material due to the condensation processes [14]. The average sizes of these particles lie in the nanometric range (30-150 nm) and vary depending on the exposure conditions and the type of metallic target [15].…”

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confidence: 99%

Formation and investigation of optical media containing gold nanoparticles

Goncharov

Kozadaev

Shiman

et al. 2012

J Eng Phys Thermophy

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Consideration has been given to certain aspects of condensation processes occurring in laser-induced erosion plumes of metals and giving rise to fluxes of metallic nanoparticles. Samples of colloidal solutions of gold and gold-containing polymer films have been produced as a result of precipitation of nanoobjects formed in laser erosion of gold into aqueous and polymer-containing media. The experimental samples formed have been comprehensively investigated using optical spectroscopy and transmission and scanning electron microscopy.Keywords: laser synthesis of metal nanoparticles, erosion laser plume, colloidal solution of gold, gold-containing polymer film, surface plasmon resonance.Introduction. The increasing practical interest currently expressed in methods of formation and investigation of isolated metal nanoparticles is due to the wide range of advantages which are offered by traditional media modified by metallic nanostructures. Ultradisperse metal-containing media may exhibit exotic electrical, magnetic, optical, thermophysical, chemical, biological, and other properties [1-3]. The mentioned features are determined by the presence of the so-called dimensional effects in isolated metal particles with a diameter less than 100 nm [2].Numerous methods of formation of ultradisperse metal-containing media have been developed to date. All these approaches can be subdivided into three conventional groups, as far as the principle of formation is concerned, i.e., physical (e.g., [4,5]), chemical [6,7], and combination (physicochemical) [8] ones. The enumerated methods offer their own advantages and drawbacks and can be applied to the solution of certain technological problems.However, properties characteristic of gold as a metal (chemical stability, inertia, relative infusibility, and high specific weight) make it impossible to use in full measure most of the existing methods of obtaining nanostructures. Chemical methods traditionally used for these purposes are rather labor-intensive and expensive [7]. We can consider the technique of laser synthesis of colloidal solutions of gold [9] as an alternative solution; this technique is based on the fact that the products of laser erosion from gold targets enter trapping media whose composition may vary. The use of today's frequency-modulated lasers for production of gold-containing colloids makes it possible to improve the competitiveness of the procedure of laser synthesis compared to other techniques of formation of ultradisperse metalcontaining media. Additional advantages of the indicated technique are the technological simplicity of the synthesis plant, the possibility of controlling the process of synthesis on line, and the high rates of formation of colloids. Character of Destruction of Metallic Targets by Submicrosecond Laser Pulses.In the process of exposure of metals to intense submicrosecond optical radiation pulses in a thin surface region of the target, part of the pulse is absorbed by conduction electrons [10]. It should be noted that the initially high co...

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Start of condensation in erosional jets of metals subjected to highly intense submicrosecond laser action

Cited by 8 publications

References 7 publications

Possibility of applying a hydrodynamic model to describe the laser erosion of metals irradiated by high-intensity nanosecond pulses

Possibility of applying a hydrodynamic model to describe the laser erosion of metals irradiated by high-intensity nanosecond pulses

Investigation of Noble Metals Colloidal Systems Formed by Laser Synthesis at Air

Formation and investigation of optical media containing gold nanoparticles

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