Parametric self-enhancement of the spontaneous decay of sound in superfluid helium.
作者： J. S. Foster , S. Putterman
DOI: 10.1103/PHYSREVLETT.54.1810
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摘要: The spontaneous decay of coherent monochromatic sound is dramatically self-enhanced by parametric amplification. We observed this effect for the first time with 3.25-GHz in superfluid helium at 85 mK. Starting a typical intensity 10 W/m/sup 2/ beam depleted more than 99.9% over just 1 mm propagation distance. In addition we observed, contrast to Landau-Rumer processes, an exponential coefficient proportional square root initial intensity.
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