Analytical Solutions For Laser Heating And Burnthrough Of Opaque Solid Slabs

Robert J. Harrach

doi:10.1117/12.954964

30 December 1976 Analytical Solutions For Laser Heating And Burnthrough Of Opaque Solid Slabs

Robert J. Harrach

Proceedings Volume 0086, Industrial Applications of High Power Laser Technology; (1976) https://doi.org/10.1117/12.954964
Event: 20th Annual Technical Symposium, 1976, San Diego, United States

Abstract

The thermal response of an opaque solid slab exposed to intense laser radiation is described using the heat-balance integral method. Approximate analytical solutions are obtained for the one-dimensional temperature distribution T(x,t), for the velocity xs(t) of the moving vapor-phase boundary, and for various derived quantities such as the front-surface vaporization time tv, the time to back-surface heating tℓ and the sample burnthrough time tBT. Account is taken of the influence on tℓ and tBT of partial vaporization of the target material. The thermophysical properties of the target are assumed to be constant independent of temperature, but the theory accommodates a time-varying laser intensity and a temperature-dependent surface absorptivity. Illustrative burnthrough-time calculations are presented for aluminum, stainless steel, and carbon phenolic targets, covering a wide range of values of target thickness and laser intensity.

Citation Download Citation

Robert J. Harrach "Analytical Solutions For Laser Heating And Burnthrough Of Opaque Solid Slabs", Proc. SPIE 0086, Industrial Applications of High Power Laser Technology, (30 December 1976); https://doi.org/10.1117/12.954964

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