Modeling of strong laser radiation interaction with objects under the conditions of surface air blow

Roman Ostrowski; Karol Jach; Robert Świerczyński; Marek Strzelec; Antoni Rycyk; Wojciech Skrzeczanowski

doi:10.1117/12.2516556

4 December 2018 Modeling of strong laser radiation interaction with objects under the conditions of surface air blow

Roman Ostrowski, Karol Jach, Robert Świerczyński, Marek Strzelec, Antoni Rycyk, Wojciech Skrzeczanowski

Proceedings Volume 10974, Laser Technology 2018: Progress and Applications of Lasers; 109740N (2018) https://doi.org/10.1117/12.2516556
Event: Thirteenth Symposium on Laser Technology, 2018, Jastarnia, Poland

Abstract

The earlier papers of the team presented the results of theoretical analyses concerning the interaction of CW laser radiation with metal targets. Laser power ranged from 1 to 10 kW and the thickness of targets ranged between 0.1 and 1 cm. It was also assumed that the beam diameter at an Al target was around 1 cm. The present paper describes another variant of similar interaction, with simultaneous blowing of air on the object surface. Like before, the mathematicalphysical model of the phenomenon was based on the equation of conservation of energy (spatially one-dimensional model – (z,t)), taking into account: radiation absorption and transport inside the target, heat conduction, reflection of part of radiation from the target’s surface and heat losses in the processes of melting and evaporation. Coefficients of light absorption and reflection from the target’s surface were described with semi-empirical expressions which took into account their dependence on temperature and density. Calculations were performed for conditions with and without the removal of melted layers and for two variants of laser radiation pulses: (1) 1 kJ of energy with a duration of 2x10^-4 s, and (2) 10 kJ of energy with a duration of 1 s. The most interesting result of the calculations is the effect of significant impact of the blowing out of melted layers to the thickness of melting only in the case of shorter pulses with higher peak power.

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Roman Ostrowski, Karol Jach, Robert Świerczyński, Marek Strzelec, Antoni Rycyk, and Wojciech Skrzeczanowski "Modeling of strong laser radiation interaction with objects under the conditions of surface air blow", Proc. SPIE 10974, Laser Technology 2018: Progress and Applications of Lasers, 109740N (4 December 2018); https://doi.org/10.1117/12.2516556

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KEYWORDS

Aluminum

Mathematical modeling

Absorption

Metals

Pulsed laser operation

Reflection

Systems modeling

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