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Conference: Bucharest University Faculty of Physics 2017 Meeting

Section: Optics, Spectroscopy, Plasma and Lasers

Title:

The theoretical basis for laser processing of crystalline solids

Authors:

Laurențiu ŞUFARU (1,2), Anca BUCĂ (2), Mihai OANE (3), Carmen RISTOSCU (3), Ion N. MIHĂILESCU (3)

^*
Affiliation:

1) C.B.R.N. Defense and Ecology Scientific Research Center, 225 Olteniţei Str., Bucharest,Romania

2)Faculty of Physics, University of Bucharest, 077125, Magurele, Ilfov,Romania

3) National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Str., Magurele, 077125 Romania

E-mail

laurentiu16@lycos.com

Keywords:

integral transform technique for partial differential equations, heat equation , strong lasers, windows lasers.

Abstract:

We propose a coherent mathematical model [1, 2, 3] for laser processing of crystalline solids when the solid’s temperature excursion is not very large. In fact, we treat the heat equations [4, 5] for two major cases fulfilling the conditions: i) the sample’s absorption coefficient is very small (e.g. ZnSe, GaAs,); and ii) the laser intensity is quite high. The authors goal was to provide to experimentalists a model for the thermal laser optical window behavior to be used in a first approximation to describe interaction of the extreme light intensity beams generated by the new EU laser facilities in construction. The condition of small temperature is important because one can validate the assumption on thermal independence for optical and thermal parameters and the possibility to use the linear absorption coefficient approximation. The integral transform technique was applied to solve the heat equation [6, 7, 8, 9, 10]. The model is very accurate for super strong lasers- optical windows.

References:

[1] N. S. Koshlyakov, M.N. Smirnov, E. B. Gliner, “Differential equation of mathematical physics” North-Holland Publishing, Amsterdam, 1964, monograph;

[2] M. Oane, A. Peled , R. V. Medianu, "Notes on Laser Processing", Lambert Academic Publishing, Germany, ISBN 978-3-659-487-48739-2;2013, monograph;

[3] M. Oane, D. Ticoş, C. M.Ticoş, “Charged particle beams processing versus laser processing”, Scholars' Press, Germany, ISBN 978-3-639-66753-0; 2015, monograph.

[4] W.W. Duley , CO2 Lasers – Effects and Applications, Academic Press, New York, San Francisco, London, 1976, monograph;

[5] H.S.Carslaw and J.C. Jaeger, Conduction of Heat in Solids, 2 nd ed., Oxford University Press, London, 1959, monograph;

[6] M. Oane, A. Peled, F. Scarlat, I. N. Mihailescu, A. Scarisoreanu, G. Georgescu, Infrared Physics & Technology , 51 , 242-245 (2008);

[7] M. Oane, A. Peled, F. Scarlat, I. N. Mihailescu, G. Georgescu, Infrared Physics & Technology, 51 ,348-350 (2008);

[8] M. Oane, F. Scarlat, I. N. Mihailescu, Infrared Physics & Technology, 51, 344-347 (2008);

[9] M. Oane, R. V. Medianu and A. Bucă, “Radiation Effects in Materials”, ed. In Tech, Croatia, 2016, pp. 413-430;

[10] L. Şufaru, M. Oane, G. Popescu-Pelin, N. Mihăilescu, A. Bucă, I. N. Mihăilescu, Optoelectronics And Advanced Materials – Rapid Communications Vol. 11, No. 3-4, March-April 2017, pp. 161 – 163.

Acknowledgement:

M.O., C.R. and I.N.M. acknowledge with thanks the financial support of this work under the research contract POC 135/23.09.2016. The National Authority also supported this work for Research and Innovation in the frame of Nucleus program/2017.