A googlesearch under the heading of "sonoluminescence" will reveal years and years of papers and observations about this phenomenon, but not yet developed into a workable application. This is the first time, however, I have seen a positive claim that the sonoluminescence is related to fusion. If it turns out to be true then we have a wonderful problem in thermodynamics on our hands because it appears to be energy production over unity. -- depending opn how much the ultrasounds costs in energy per joule produced by the fusion process.