Laser-induced incandescence of carbon surface at various values of ambient air pressure

Zelenska, Kateryna; Kopyshinsky, Alexandr V.; Поперенко, Л. В.

doi:10.1109/fotonica.2014.6843884

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…In some cases, when recording LITE at a fixed wavelength (through a monochromator), the dependence of the thermal emission intensity on the intensity of pulsed laser excitation can be approximated by a power function with the index of the order of 10. In addition, it is worth noting that the characteristics of LITE may depend on external factors (atmospheric pressure, temperature, humidity) [12], on the surface roughness [13][14][15], and also on the previous history of the laser irradiation of samples [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…LITE was observed on various carbon materials [10][11][12][13][14][15][16][17], as well as on some semiconductors (Si, Ge, GaSb, InSb) [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the calculations involve the presence of air both above the surface of the irradiated sample and inside the pores. It should be noted that the first report on the experimental evidence of the effect of air on the intensity of LITE of surface layers of carbon materials was given in work [12], but the kinetics of the emission was not investigated.…”

Section: Introductionmentioning

confidence: 99%

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The Role of Air in Laser-Induced Thermal Emission of Surface Layers of Porous Carbon Materials

Zelensky,

Kolesnik,

Yashchuk

2023

Ukr. J. Phys.

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The influence of the surrounding air on the amplitude and shape of thermal radiation pulses (at a wavelength of 430 nm) during the heating of the surface layer of a porous carbon material (to temperatures of the order of 2000–3000 K) by the radiation of a Q-switched neodymium laser is studied. When the pressure of the surrounding air is reduced to forevacuum conditions, the experiments showed a one-and-a-half-fold increase in the amplitude of pulsed signals of thermal radiation and an increase in the decay time of the glow by about a third. Numerical calculations of the dynamics of the temperature field in the surface layer of the material during the irradiation by nanosecond laser pulses are carried out. An improved model is used in the calculations, which accounts for (i) the porosity of the material and (ii) the temperature dependence of the coefficients of thermal conductivity and the heat capacities of carbon and air. To calculate the thermal conductivity of the porous material, a model of a cubic array of intersecting square rods is used. The satisfactory consistency of calculation results with experimental data is obtained. The above-mentioned improvements of the calculation model made it possible to reconcile the estimates of the thermal characteristics of surface layers of carbon, obtained from the emission decay data, with the reference data published in the literature.

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Section: Introductionmentioning

confidence: 99%

“…LITE was observed on various carbon materials [10][11][12][13][14][15][16][17], as well as on some semiconductors (Si, Ge, GaSb, InSb) [18,19].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Role of Air in Laser-Induced Thermal Emission of Surface Layers of Porous Carbon Materials

Zelensky,

Kolesnik,

Yashchuk

2023

Ukr. J. Phys.

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Laser-induced incandescence of GaSb/InGaSb surface layers

Kokhan

Koleshnia

Zelensky

et al. 2018

Optics & Laser Technology

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Laser-induced incandescence of rough carbon surfaces

et al. 2016

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Laser-induced incandescence (LII) of rough carbon surfaces was studied under the Q-switched YAG:Nd laser excitation. For the surfaces irradiated by a sequence of laser pulses, the nonmonotonic behavior of LII intensity with the increase of number of irradiating laser pulses was observed. Computer simulation of pulsed laser heating of rough carbon surfaces revealed essential non-uniformity of the temperature field on the irradiated surface hence the surface relief is affected by the laser irradiation due to the processes of evaporation of the peaks on the irradiated surface. The intensity of LII was calculated as a function of height of the surface roughness. The results of calculations explain the observed features of LII of carbon surfaces.

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Laser-induced incandescence of carbon surface at various values of ambient air pressure

Cited by 3 publications

References 6 publications

The Role of Air in Laser-Induced Thermal Emission of Surface Layers of Porous Carbon Materials

The Role of Air in Laser-Induced Thermal Emission of Surface Layers of Porous Carbon Materials

Laser-induced incandescence of GaSb/InGaSb surface layers

Laser-induced incandescence of rough carbon surfaces

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