Thermal and impulse coupling to an aluminum surface by a pulsed KrF laser

Woodroffe, J. A.; Hsia, J.; Ballantyne, A.

doi:10.1063/1.91298

Cited by 30 publications

(7 citation statements)

References 4 publications

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“…The only difference is that now the strain, c, on trhesurface is: The model predictions will now be compared to the available data. (8) As described in that paper and illustrated in Figure lO from,(g) the amplitude of the shear displacement decreased as air plasma was formed. On the other hand, the amplitude of the longitudinal displacement increased initially and, after reaching a peak, it decreased.…”

Section: %mentioning

confidence: 55%

“…However, with a UV laser,(B'9) where the photons are more energetic and where the absorptivity of the surface is much higher, the interaction is different. In fact, h,ighthermal coupling and significant (8,9) impulse even at low laser fluences were observed in that regime. reported.…”

Section: A-7mentioning

confidence: 91%

“…13 and 14, and' , especially Ref 16,. a more mathematical approach to the heat conduction problem is given.Many thousands of articles andreports have been published on the generation of elastic waves in solids, since it is necessary to understand the basic theory of elastic waves, a number of key textbooks on this subject(I'[7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]are included in the reference,list. In this survey, we will primarily focus on the phenomena associated with ultrasonic waves, which are only a small part of the spectrum of elastic waves.…”

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confidence: 99%

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Development and evaluation of a workpiece temperature analyzer for industrial furnaces

1990

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confidence: 55%

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confidence: 91%

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Development and evaluation of a workpiece temperature analyzer for industrial furnaces

1990

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“…Since pulsed ultraviolet laser presents favorable characteristics such as short wavelength, high photon energy, thermal effects which differ from infrared laser, the research into interactions between pulsed ultraviolet laser and materials has aroused universal attentions in recent years [1][2][3][4][5][6][7][8][9][10][11] . High power ultraviolet lasers are expected to be widely applied in precision laser machining and military field.…”

Section: Introductionmentioning

confidence: 99%

Study on damage of K9 glass under 248nm ultraviolet pulsed laser irradiation

Wang

Fang

2015

SPIE Proceedings

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The damage of K9 glass under 248nm ultraviolet pulsed laser irradiation was studied. The laser pulse energy was kept within the range of 60mJ to 160mJ, and the repetition rate was adjusted within the range of 1Hz to 40Hz. The damage morphologies of single-pulse and multi-pulse laser irradiation were characterized by optical microscope, and the damage mechanism was discussed. The experimental results indicated that the damage of K9 glass irradiated by 248nm ultraviolet laser mainly followed the thermal-mechanical coupling mechanism and the damage threshold of K9 glass was 2.8J/cm 2 . The intensity of damage area increased gradually with the increase of the laser pulse number. It was shown that accumulation effect of laser induced damage to K9 glass was obvious.ultraviolet pulsed laser, laser induced damage threshold, damage morphology, K9 glass

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“…1 e K (4) Where E and E r are vaccum and relative permittivity ; e and k are the electronic charge and Bolzmann constant ; K is thermal conductivity of the target ; T. is the surface temperature of the target in solid or liquid state. If the temperature is lower than the critical value,the electroconductibility can approximatly be taken as8.…”

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Coupling effects of pulsed X e Cl laser radiation to aluminum

Zhang

Liu

1993

SPIE Proceedings

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In this paper ,We present a theoretical model which treats one-dimensional target heating and vaporization as well as energy absorption and collision reactions in the melting metal vapor. The coupling effects have been calculated for 0. 3O8-im XeCl laser radiation to Aluminium. The mcident laser intensity and the pulsed duration are 107-109W/cm2 and 80-ns respectively. The time relations of thermal and impulse coupling coefficients are obtained by solving non-linear heat conduction and rate equations about the temperature and density. These results are compared with the experiment measurements and the agreement is fairly good. I . INTRODUCTIONA lot of studies on interaction of pulse laser with metal targets in vaccum have been carried out experimentally and theoritically. Most of these were often limited to the coupling of infrared laser to the metal targets. With the occurrence of high power pulse UV laser and the important roles of UV laser in application,the valuable investigation results in this aspect were given over the past ten years'6. The large absorptivty of metals in the ultraviolet makes excimer lasers appear particularly attractive in the processing of mteals. Rosen"2investigated the coupling proccesses of pulse XeF laser to aluminium and titanium alloys. They obtained interesting pressure parameters by means of the rate equation in uniform vapor layer. Newstein5 developed the theory presented by Harrach7 ,considered the effect of convective flow ,and gave the distribution property in vapor layer by solving the rate equations of density and temperature.The response of a metal surface to irradiation by a high intensity pulse laser consists of several stages. The heated surface first reaches the melting temperature and forms a melt layer. The temperature rises continuously until evaporation commences. Part of the absorbed laser then goes into the latent heat of vaporization kinetic energy of the removed mass and heating of the expelled vapor while the remainder of the energy is conducted into the solid or liquid. Ultimately, under the condition where the intensity is not so high that the expelled vapor becomes strongly absorbing, the system asymptotically approaches a steady state,in which all of the absorbed laser goes into va-Porization at the surface,and the temperature profile within the tatget remains constant. 0-8194-1

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Thermal and impulse coupling to an aluminum surface by a pulsed KrF laser

Cited by 30 publications

References 4 publications

Development and evaluation of a workpiece temperature analyzer for industrial furnaces

Development and evaluation of a workpiece temperature analyzer for industrial furnaces

Study on damage of K9 glass under 248nm ultraviolet pulsed laser irradiation

Coupling effects of pulsed X e Cl laser radiation to aluminum

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