Acoustic characterization of microbubble dynamics in laser-induced optical breakdown

A real-time acoustic technique to characterize microbubbles produced by laser-induced optical breakdown (LIOB) in water was developed. Femtosecond laser pulses are focused just inside the surface of a small liquid tank. A tightly focused, high frequency, single-element ultrasonic transducer is posit...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2003-05, Vol.50 (5), p.517-522
Main Authors: Milas, S.M., Jing Yong Ye, Norris, T.B., Hollman, K.W., Emelianov, S.Y., O'Donnell, M.
Format: Article
Language:English
Subjects:
Acoustic emission
Acoustic measurements
Acoustic pulses
Acoustics
Breakdown
Bubbles
Collapse
Electric breakdown
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Lasers
Microorganisms
Optical pulses
Optical recording
Physics
Pulse measurements
Surface emitting lasers
Tanks
Transducers
Ultrafast optics
Ultrasonic transducers
Underwater sound
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Summary:A real-time acoustic technique to characterize microbubbles produced by laser-induced optical breakdown (LIOB) in water was developed. Femtosecond laser pulses are focused just inside the surface of a small liquid tank. A tightly focused, high frequency, single-element ultrasonic transducer is positioned so its focus coincides axially and laterally with this laser focus. When optical breakdown occurs, a bubble forms and a pressure wave is emitted (i.e., acoustic emission). In addition to this acoustic signal, the microbubble is actively probed with pulse-echo measurements from the same transducer. After the bubble forms, received pulse-echo signals have an extra pulse, describing the bubble location and providing a measure of axial bubble size. Wavefield plots of successive recordings illustrate the generation, growth, and collapse of cavitation bubbles due to optical breakdown. These same plots also can be used to quantify LIOB thresholds.
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2003.1201464