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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:26 |
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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 BUCA (2), Mihai OANE (3) , Carmen RISTOSCU (3), Ion N. MIHAILESCU (3)
*
Affiliation:
1)1C.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] for laser processing of crystalline solids when the solid’s temperature variation is not very large. In fact, we treat the heat equations for two major cases fulfilling our condition: i) the sample’s absorption coefficient is very small (e.g. ZnSe, GaAs,); and ii) the laser intensity is very high. The authors goal was to give to experimentalists a thermal model for the laser optical windows thermal behavior like a first approximation for the super strong lasers under construction at Bucharest, Budapest and Prague. The condition of small temperature variations has two advantages: validates the assumption on thermal independence for optical and thermal parameters and the possibility to make use of the linear absorption coefficient approximation [2,3]. We use the integral transform technique in order to solve the heat equation., 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.
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.
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