Luminescence from acoustic-driven laser-induced cavitation bubbles

Area of Science:

• Acoustics
• Bubble Dynamics
• Nonlinear Optics

Background:

• Laser-induced cavitation bubbles exhibit complex dynamics, including oscillation and collapse.
• Cavitation luminescence provides insights into bubble behavior and energy release.
• External acoustic fields can influence bubble dynamics and light emission.

Purpose of the Study:

• To experimentally investigate the effect of continuous sound fields on laser-induced bubble oscillation and cavitation luminescence.
• To predict and compare the bubble collapse phase using a numerical model.
• To identify key parameters influencing bubble dynamics and luminescence.

Main Methods:

• Experimental setup involving transient laser-induced bubbles in a continuous sound field.
• Optical observation of bubble dynamics and measurement of cavitation luminescence.
• Application of a simple numerical model to predict bubble collapse phase.

Main Results:

• Continuous sound fields significantly influence the first oscillation cycle and cavitation luminescence.
• Bubble dynamics are primarily governed by generation phase, bubble size, and sound field amplitude.
• Experimental results show both enhancement and reduction of luminescence due to the sound field.

Conclusions:

• The study elucidates the interplay between acoustic fields and laser-induced cavitation bubbles.
• A simple numerical model can predict variations in the bubble collapse phase.
• Strategies for enhancing bubble collapse strength are proposed based on experimental findings.