Using degenerate parametric interaction of intense acoustic beams to amplify weak signals

The paper considers the degenerate parametric interaction of an intense acoustic pumping beam and a weak signal beam at the subharmonic. The use of a special emitter system with independent signal emission at the harmonic and subharmonic made it possible to study the features of nonlinear interactio...

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Bibliographic Details
Published inAcoustical physics Vol. 63; no. 3; pp. 260 - 269
Main Authors Gurbatov, S. N., Derybin, M. S., Kas’yanov, D. A., Kurin, V. V.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.05.2017
Springer Nature B.V
Subjects
Acoustics
Amplification
Beams (radiation)
Efficiency
Emission analysis
Harmonics
Nonlinear Acoustics
Nonlinearity
Physics
Physics and Astronomy
Pumping
amplification
nonlinearity
acoustics
sound beams
harmonic
degenerate interaction
subharmonic
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Summary:The paper considers the degenerate parametric interaction of an intense acoustic pumping beam and a weak signal beam at the subharmonic. The use of a special emitter system with independent signal emission at the harmonic and subharmonic made it possible to study the features of nonlinear interaction both for different amplitude levels and arbitrary phase relations of the fields at these frequencies. Just as predicted in the theory, the experiment showed that signal amplification at the subharmonic hardly occurs at all. It is shown that the use of odd field harmonics, which are absent for a zero amplitude of the signal wave, makes it possible to substantially increase the efficiency of isolating a weak signal wave. The interaction of beams for large and small acoustic Reynolds numbers of the signal wave is studied.
ISSN:1063-7710
1562-6865
DOI:10.1134/S1063771017020063