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Novel laser-induced cavitation

Novel laser-induced cavitation : the constrained ring bubble

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Info

Original languageEnglish
TitlePhotons plus ultrasound
Subtitleimaging and sensing 2010
EditorsAlexander A. Oraevsky, Lihong V. Wang
Place of publicationBellingham
PublisherSPIE-International Society for Optical Engineering
Publication date2010
Pages-
Number of pages10
Volume7564
ISBN (Print)9780819479600
DOIs
StatePublished

Publication series

NameProceedings of SPIE
Volume7564
ISSN (Print)0277-786X

Conference

ConferenceConference on Photons Plus Ultrasound - Imaging and Sensing 2010
CountryUnited States
CitySan Francisco
Period24/01/1026/01/10

Abstract

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 so-called 'doughnut mode', with an axial intensity minimum. Focusing this modulated pulse into the liquid induced a ring-shaped 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.

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