Pub Date : 2002-01-01DOI: 10.1080/0898150021000054539
B. Martin, A. Loredo, D. Grevey, A. Vannes
This article presents a thermal finite volume model adapted to investigate laser processes. It is specially developed to treat moving heat sources with phase changes, melting and vapourisation. Heat transfer control in laser processing is particularly useful when processes must respect prescribed temperatures, or more generally, prescribed constraints. These processes involve generally several laser sources, or non-conventional power distribution. Hence, they have numerous parameters to set. Experimental optimisation is difficult and may be expansive. The numerical model is a useful and cheaper tool for development of those complex processes. For example in this article, two special laser processes are investigated: control of high carbon steel welded line cooling, zinc-coated sheets lap welding.
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Pub Date : 1900-01-01DOI: 10.1080/08981500290022770
J. Marciak-kozlowska, M. Kozłowski
Recently the measurement of X-ray pulses approaching the attosecond frontier was published (M. Drescher et al ., Science 291 (2001) p. 1923). The attosecond laser pulse enables the study and control of the motion of electrons inside atoms. In this paper we develop and solve the modified Schrodinger equation (MSE) which describes the interaction of electrons with its surroundings in an atom. This interaction can be detected only using an attosecond laser pulse within the relaxation time of the interaction which is of the order of 10 attoseconds.
最近发表了接近阿秒边界的x射线脉冲测量(M. Drescher et al .， Science 291 (2001) p. 1923)。阿秒激光脉冲使研究和控制原子内电子的运动成为可能。本文建立并求解了描述原子中电子与周围环境相互作用的修正薛定谔方程(MSE)。这种相互作用只能在10阿秒量级的相互作用弛豫时间内使用阿秒激光脉冲来检测。
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