期刊
ULTRAMICROSCOPY
卷 81, 期 3-4, 页码 141-147出版社
ELSEVIER
DOI: 10.1016/S0304-3991(99)00180-1
关键词
high-speed transmission and photoelectron microscopes; deformations and melt instabilities after ns and fs laser pulses
类别
Combining electron optics, fast electronics and pulsed lasers, a transmission and a photoelectron emission microscope were built, which visualize events in thin films and on surfaces with a time resolution of several nanoseconds. The high-speed electron microscopy is capable to track fast laser-induced processes in metals below the ablation threshold, which are difficult to detect by other imaging techniques. The material response to nano- and femtosecond laser pulses was found to be very different. It was dominated by thermo/chemocapillary flow and chemical reactions in the case of nanosecond pulses, and by mechanical deformations and non-thermal electron emission after a femtosecond pulse. (C) 2000 Elsevier Science B.V. All rights reserved.
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