Hee K. Park, Xianfan Xu, et al.
Applied Physics Letters
Various optical techniques are analyzed regarding their use for narrow acoustic pulse detection. Two-beam interferometers can be used to detect surface displacements or velocities associated with surface acoustic waves. Surface gradients can be detected by the probebeam deflection technique; this method is applicable to both surface and bulk acoustic wave analysis. It is demonstrated that with a similar optical set-up focusing or defocusing (lensing effect) can be observed, which results in comparable detection sensitivity. For all the techniques described, a detection sensitivity of 10-4Á / √Hzfor surface displacement can typically be achieved. The highest frequency surface acoustic wave detectable is limited by the focal spot size to the gigahertz range. © 1986 IEEE
Hee K. Park, Xianfan Xu, et al.
Applied Physics Letters
David A. Willis, Xianfan Xu, et al.
SPIE Photonics West 1997
S.E. Chen, Steven W. Meeks, et al.
Review of Scientific Instruments
Guofei Chen, Xianfan Xu, et al.
IMECE 1998