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

Research output: Contribution to journalArticle

59 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 languageEnglish (US)
Pages (from-to)3782-3784
Number of pages3
JournalApplied Physics Letters
Volume69
Issue number25
DOIs
StatePublished - Dec 16 1996

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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