Controlling phase change through ultrafast excitation of coherent phonons.
Controlling phase change through ultrafast excitation of coherent phonons.
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DOI：
10.1364/oe.18.020498
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发表时间：
2010-09
期刊：
影响因子：
3.8
通讯作者：
C. Liebig;Yaguo Wang;Xianfan Xu
中科院分区：
文献类型：
--
作者：
C. Liebig;Yaguo Wang;Xianfan Xu
对于铋等半金属，在低于损伤阈值的激光能量密度下，超快飞秒激光激发的相干声子已经得到了广泛的研究。在这项工作中，我们研究相干声子振荡是否有助于材料的永久损伤，或者可以增强或抑制这种损伤。我们采用时间形状的飞秒脉冲，以增强或取消相干声子振荡。我们的研究结果表明，飞秒脉冲，增强和取消声子振荡所造成的材料的损伤有明显的差异，表明通过相干控制声子振荡控制相变的可能性。
For semimetals such as bismuth, ultrafast femtosecond laser-excited coherent phonons at laser fluences below the damage threshold have been studied extensively. In this work, we investigate whether or not coherent phonon oscillations contribute to material's permanent damage, or can enhance or suppress such damage. We employed temporally-shaped femtosecond pulses to either enhance or cancel coherent phonon oscillations. Our results showed a clear difference in material's damages caused by femtosecond pulses that enhance and cancel phonon oscillations, demonstrating the possibility of controlling phase changes by coherent control of phonon oscillations.