Single-bubble sonoluminescence has been experimentally produced through a novel approach of optimized sound excitation. A driving consisting of a first and second harmonic with selected amplitudes and relative phase results in an increase of light emission compared to sinusoidal driving. We achieved a raise of the maximum photocurrent of up to $300%$ with the two-mode sound signal. Numerical simulations of multimode excitation of a single bubble are compared to this result.
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Holzfuss et al. (1998) studied this question.
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