Time resolved evolution of structural, electrical, and thermal properties of copper irradiated by an intense ultrashort laser pulse
Time resolved evolution of structural, electrical, and thermal properties of copper irradiated by an intense ultrashort laser pulse
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强超短激光脉冲照射下铜的结构、电学和热学性质的时间分辨演化
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发表时间：
2005
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通讯作者：
G. Kumar
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作者：
A. Sandhu;A. Dharmadhikari;G. Kumar
在皮秒时间尺度上，利用100fs激光脉冲，在1015Wcm−2（与飞秒微加工相关的强度范围）下获得了铜金属的动态特性。利用飞秒泵浦-探针反射率，得到了宽温度范围内的耗散机制和标度规律。我们观察到由于强激光脉冲引起的晶格无序，在400fs内铜的晶体结构被湮没。电阻率是通过研究探针反射率在0 ~ 30ps范围内的演化得到的。详细研究了热等离子体和冷固体之间未开发状态下的“电阻率饱和”效应。得到了温度演化和导热系数值。
The dynamical properties of copper metal are obtained on a picosecond time scale using 100fs laser pulse at 1015Wcm−2—an intensity regime relevant to femtosecond micromachining. The dissipation mechanisms and scaling laws spanning a wide temperature range are obtained from femtosecond pump–probe reflectivity. We observe obliteration of the crystalline structure in copper within 400fs due to lattice disorder caused by the intense laser pulse. The electrical resistivity is obtained by studying the probe reflectivity evolution from 0to30ps. The “resistivity saturation” effect in an unexplored regime intermediate to hot plasma and cold solid is studied in detail. The temperature evolution and thermal conductivity values are also obtained.