Laser picosecond acoustics with oblique probe light incidence
Laser picosecond acoustics with oblique probe light incidence
复制标题
DOI：
10.1063/1.1519679
复制
发表时间：
2003-01-01
影响因子：
1.6
通讯作者：
Wright, OB
中科院分区：
文献类型：
--
作者：
Matsuda, O;Wright, OB
激光皮秒声学是利用超短光脉冲在薄膜中激发和探测皮秒声应变脉冲。倾斜探测光入射的使用允许在选择光学探测条件时有更大的自由度，并且因此应该允许提取关于传播的声应变脉冲的轮廓的更多信息。在这里，我们提出了一个理论的调制反射光斜入射从固体包含声应变分布。该理论可以解释反射率变化的真实的和虚部，并涉及瞬态表面运动和光弹性调制的固体介电常数的影响。我们显示，特别是，如何可以应用该理论提取的贡献所产生的反射率变化的表面运动在一个不透明的各向同性固体，从而允许直接访问的形状的声应变脉冲在其中传播。(C)2003年，美国物理学会。
Laser picosecond acoustics involves the excitation and detection of picosecond acoustic strain pulses in thin films with ultrashort light pulses. The use of oblique probe light incidence permits a greater degree of freedom in choosing the optical probing conditions and thereby should allow the extraction of more information about the profile of the propagating acoustic strain pulses. Here, we present a theory for the modulation of light reflected at oblique incidence from a solid containing an acoustic strain distribution. The theory can account for the real and imaginary parts of the reflectance variation, and involves both the effect of the transient surface motion and of the photoelastically modulated dielectric constants in the solid. We show, in particular, how the theory can be applied to extract the contribution to the reflectance change arising from the surface motion in an opaque isotropic solid, thereby allowing direct access to the shape of the acoustic strain pulse propagating therein. (C) 2003 American Institute of Physics.