可见光和NIR超短脉冲laser在铋中产生相干声子：位移与脉冲激发机制
Generation of coherent phonons in bismuth by ultrashort laser pulses in the visible and NIR: displacive versus impulsive excitation mechanism
摘要：
我们采用飞秒抽运-探测技术，利用可变抽运波长研究了铋单晶的相干晶格动力学。比较两种不同对称性的Eg和A1 g声子模的相干振幅随泵浦光子能量的变化及其各自的自发共振拉曼谱，发现它们的产生机制是完全不同的。我们发现，位移激发是产生相干A1 g声子的主要机制，但不能归结为产生低对称性相干晶格模的拉曼散射
英文摘要：
We have applied femtosecond pump-probe technique with variable pump wavelength to study coherent lattice dynamics in Bi single crystal. Comparison of the coherent amplitude as a function of pump photon energy for two different in symmetry Eg and A1g phonon modes with respective spontaneous resonance Raman profiles reveals that their generation mechanisms are quite distinct. We show that displacive excitation, which is the main mechanism for the generation of coherent A1g phonons, cannot be reduced to the Raman scattering responsible for the generation of lower symmetry coherent lattice modes
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