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

Bruno F. Pouet; R. K. Ing; Sridhar Krishnaswamy; D. Royer

doi:10.1063/1.116997

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

Bruno F. Pouet^*, R. K. Ing, Sridhar Krishnaswamy, D. Royer

^*Corresponding author for this work

Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

69 Scopus citations

Abstract

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∥〈110〉∥ and G∥〈001〉, where G is the grating wave vector, are investigated. Very good sensitivity is demonstrated for the detection of small amplitude ultrasonic surface displacements.

Original language	English (US)
Pages (from-to)	3782-3784
Number of pages	3
Journal	Applied Physics Letters
Volume	69
Issue number	25
DOIs	https://doi.org/10.1063/1.116997
State	Published - Dec 16 1996

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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@article{11375bcc63ec4d898346ebd1dfdc7f52,

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

abstract = "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∥〈110〉∥ and G∥〈001〉, where G is the grating wave vector, are investigated. Very good sensitivity is demonstrated for the detection of small amplitude ultrasonic surface displacements.",

author = "Pouet, {Bruno F.} and Ing, {R. K.} and Sridhar Krishnaswamy and D. Royer",

year = "1996",

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T1 - Heterodyne interferometer with two-wave mixing in photorefractive crystals for ultrasound detection on rough surfaces

AU - Pouet, Bruno F.

AU - Ing, R. K.

AU - Krishnaswamy, Sridhar

AU - Royer, D.

PY - 1996/12/16

Y1 - 1996/12/16

N2 - 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∥〈110〉∥ and G∥〈001〉, where G is the grating wave vector, are investigated. Very good sensitivity is demonstrated for the detection of small amplitude ultrasonic surface displacements.

AB - 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∥〈110〉∥ and G∥〈001〉, where G is the grating wave vector, are investigated. Very good sensitivity is demonstrated for the detection of small amplitude ultrasonic surface displacements.

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

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