Novel Laser-Induced Cavitation: The Constrained Ring Bubble

Oraevsky, A. A., Prentice, P. , Wang, L. V., Zolotovskaya, S. and Rafailov, E. (2010) Novel Laser-Induced Cavitation: The Constrained Ring Bubble. In: Photons Plus Ultrasound: Imaging and Sensing, San Francisco, CA, USA, 23 Jan 2010, 75642G. (doi: 10.1117/12.837463)

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Using high speed photography at sub-microsecond temporal resolution, we observed laser-induced cavitation within a thin film of liquid. In accordance with the literature, focusing a pulse of a gaussian-like intensity distribution into the liquid, instigated a disk-shaped cavity. The propagation of an acoustic transient, generated during the formation and expansion of the cavity, is evidenced by secondary cavitation stimulated in the surrounding liquid. Introducing a laguerre-gauss holographic diffractive optic element into the beam path, re-distributes the optical energy into the socalled 'doughnut mode', with an axial intensity minimum. Focusing this modulated pulse into the liquid induced a ringshaped cavity with a notably different dynamic to that of the disk cavity, due primarily to the encapsulated droplet, which is present from cavity initiation through expansion and subsequent deflation. In this paper we present initial observations on the novel dynamics of the ring-shaped cavity and discuss several of the distinctive features. Particularly the secondary cavitation induced in the surrounding liquid, and the implicated multiplexing of the acoustic transient generated during the ring-cavity expansion, is of interest.

Item Type:Conference Proceedings
Glasgow Author(s) Enlighten ID:Prentice, Dr Paul
Authors: Oraevsky, A. A., Prentice, P., Wang, L. V., Zolotovskaya, S., and Rafailov, E.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Published Online:23 February 2010

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