Kun Shan University Institutional Repository:Item 987654321/7956
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    题名: Temperature Distribution of Femtosecond Laser Processing for a Metal Film
    作者: Ching-Yen Ho
    Chung Ma
    关键词: Temperature distribution
    Femtosecond
    Laser
    日期: 2008-11-08
    上传时间: 2010-01-13 16:52:56 (UTC+8)
    摘要: The temperature distributions in a metal film heated by femtosecond laser are investigated in this paper. The time scale in which energy transfers from the electrons to lattice is on the order of a picosecond for metals. Therefore when the duration of femtosecond laser heating of metal films is on the order of or shorter than a picosecond, a substantial nonequilibrium can occur between the electron and lattice temperature and the metal lattices stay almost thermally undisturbed in this highly nonequilibrium regime. Assuming the system to be one-dimensional and insulated at the front and rear surfaces, a parabolic two-temperature model is employed to investigate temperature distributions in metal films irradiated by a femtosecond laser. The results reveal that electron temperature distribution along x decreases with the increasing absorption depth, coupling factor, and electron specific heat. The high thermal conductivity leads to the decrease of electron temperature with time near the front surface of the film but increase of electron temperature with time near the rear surface of the film.
    显示于类别:[機械工程系所] SME 2008第六屆全國精密製造研討會-國際製造工程學會中華民國分會

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