Pulse width measurements for sonoluminescing gas bubbles in various solutionsChansoo Lim, Jin-Seok Jeon and Ho-Young Kwak
Mechanical Engineering Department, Chung-Ang University - Seoul 156-756, Korea
received 28 November 2008; accepted in final form 9 March 2009; published April 2009
published online 14 April 2009
The pulse widths of light from sonoluminescing gas bubbles in various solutions having quite different densities were measured by a time-correlated single-photon counting (TC/SPC) method. The measured values of the pulse width were found to be in the range of 150 ps to several ns. No appreciable difference in the measured pulse width and the bubble behavior for the sonoluminescing air bubbles in various solutions was found. The measured results for the pulse width of sonoluminescence (SL) in various solutions suggest that light is emitted from the core region where the temperature is almost uniform. In addition, the theoretical estimation for the pulse widths with thermal bremsstrahlung as emission mechanism for SL provides reasonable results.
78.60.Mq - Sonoluminescence, triboluminescence.
42.65.Re - Ultrafast processes; optical pulse generation and pulse compression.
43.25.+y - Nonlinear acoustics.
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