Electromagnetic Field Correlation inside a Sonoluminescing Bubble
Pritiraj Mohanty
Abstract
We consider the correlation of the electromagnetic field to determine spatial coherence inside a sonoluminescing bubble. We explicitly calculate the first order correlation function for two limiting cases of the excitation field: a blackbody spectrum and a discrete multifrequency spectrum. The correlation length for blackbody fields at temperatures between 3000 K and 10000 K is found to be on the order of the optical wavelength, increasing with decreasing temperatures. We predict spectral lines in the emission spectrum of single bubble sonoluminescence in cooler bubbles with interior temperatures below 10000 K.
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