Heterodyne interferometer with two-wave mixing in photorefractive crystals for ultrasound detection on rough surfaces

被引：62
|
作者：
Pouet, BF [1 ]
Ing, RK [1 ]
Krishnaswamy, S [1 ]
Royer, D [1 ]
机构：
[1] UNIV PARIS 07,ESPCI,LAB ONDES & ACOUST,CNRS,URA 1503,F-75231 PARIS 05,FRANCE
来源：
APPLIED PHYSICS LETTERS | 1996年 / 69卷 / 25期
关键词：
D O I：
10.1063/1.116997
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Heterodyne interferometers using two-wave mixing in photorefractive cubic crystals for ultrasound detection on rough surfaces are demonstrated. The speckled scattered beam from a rough surface sample interferes with a planar coherent pump beam inside a photorefractive crystal. A third frequency-shifted beam is used to read the grating. The diffracted readout beam and the transmitted signal beam are wavefront matched, resulting in an optimal heterodyne interference signal. The signal to noise ratio for the two commonly used crystallographic configurations with cubic crystals, G parallel to/[110]parallel to and G parallel to[001], where G is the grating wave vector, are investigated. Very good sensitivity is demonstrated for the detection of small amplitude ultrasonic surface displacements. (C) 1996 American Institute of Physics.
引用
收藏
页码：3782 / 3784
页数：3
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