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首页> 外文期刊>Review of Scientific Instruments >Generation of surface acoustic waves in silicon with energetic femtosecond laser pulses
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Generation of surface acoustic waves in silicon with energetic femtosecond laser pulses

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The generation of surface acoustic wave (SAW) pulses in Si single crystal by femtosecond laser pulses with high energy of up to 30 mJ is studied. The generation is rather efficient even at a free silicon surface. In this case the shape of the observed SAW pulses corresponds to the thermoelastic mechanism despite the fact that a well developed ablation takes place. Excitation through a liquid layer is also studied and provides longer SAW pulses. SAW gratings are generated by focusing the laser beam through a mask and the changes in the spectrum of the pulse due to nonlinear interactions are observed. (C) 2003 American Institute of Physics. References: 7

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