Eur. Phys. J. Appl. Phys.
Volume 45, Number 1, January 2009
|Number of page(s)||7|
|Section||Semiconductors and Devices|
|Published online||25 December 2008|
Laser heating of thick layers through the backwards, self-sustained propagation of a steep and steady state thermal front
Aplinov, Presvert No. 9, 38113 Veurey-Voroize, France
Corresponding author: firstname.lastname@example.org
Revised: 30 October 2008
Accepted: 9 December 2008
Published online: 25 December 2008
We investigate theoretically a mode of heating layers using a laser beam. In this mode thermal energy, the temperature of the layer, propagates in a steady-state self sustained fashion from the bottom of the layer towards the surface and may exhibit a very steep front. The propagation exhibits a constant speed, related to the intensity of the power flux. To achieve this heating mode the absorption coefficient has to remain low in low temperatures and increase rapidly as a function of temperature in higher temperatures. Additionally, a significant temperature increase must be generated to trigger this propagation mode, for example through the presence of a strongly absorbing layer beneath the transparent layer. The mode is well suited to semiconductors, especially silicon. A few examples of applications are proposed.
PACS: 81.40.gh – Other heat and thermomechanical treatments / 81.40.tv – Optical and dielectric properties / 81.40.wx – Radiation treatment
© EDP Sciences, 2008
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