Abstract
The parametric amplification of an acoustic wave at its own frequency due to its interaction with a pump wave is found to be impossible in a homogeneous fluid because of the degenerative effects arising from the interaction between the pump wave and the upper-idler. However, a simple approach suggests that up-converter type of parametric amplification can be obtained if an incoming plane wave is assumed to interact with a locally generated high-frequency pump column. In this paper, earlier analyses are extended by using a quasilinear approach in the calculation of the interaction effects, then the effects of extra-absorption occurring at higher intensities are discussed, and the effects due to the shadow of the pump-transducer mounting formed by the incoming plane wave are indicated. Experimental results are in good agreement with the theoretical work and show that up-converter type of parametric amplification can be obtained even at modest pump-wave intensities.
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