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Title: Acoustic monitoring method and system in laser-induced optical breakdown (LIOB)

Abstract

An acoustic monitoring method and system in laser-induced optical breakdown (LIOB) provides information which characterize material which is broken down, microbubbles in the material, and/or the microenvironment of the microbubbles. In one embodiment of the invention, femtosecond laser pulses are focused just inside the surface of a volume of aqueous solution which may include dendrimer nanocomposite (DNC) particles. A tightly focused, high frequency, single-element ultrasonic transducer is positioned such that its focus coincides axially and laterally with this laser focus. When optical breakdown occurs, a microbubble forms and a shock or pressure wave is emitted (i.e., acoustic emission). In addition to this acoustic signal, the microbubble may be actively probed with pulse-echo measurements from the same transducer. After the microbubble forms, received pulse-echo signals have an extra pulse, describing the microbubble location and providing a measure of axial microbubble size. Wavefield plots of successive recordings illustrate the generation, growth, and collapse of microbubbles due to optical breakdown. These same plots can also be used to quantify LIOB thresholds.

Inventors:
 [1];  [1];  [2];  [3];  [1];  [1];  [1];  [4]
  1. Ann Arbor, MI
  2. Dexter, MI
  3. (Ann Arbor, MI)
  4. Fenton, MI
Publication Date:
Research Org.:
University of Michigan
Sponsoring Org.:
USDOE
OSTI Identifier:
984344
Patent Number(s):
7,367,948
Application Number:
10/643,659
Assignee:
The Regents of the University of Michigan (Ann Arbor, MI) HQPR
DOE Contract Number:
FG01-00NE22943
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

O'Donnell, Matthew, Ye, Jing Yong, Norris, Theodore B, Baker, Jr., James R., Balogh, Lajos P, Milas, Susanne M, Emelianov, Stanislav Y, and Hollman, Kyle W. Acoustic monitoring method and system in laser-induced optical breakdown (LIOB). United States: N. p., 2008. Web.
O'Donnell, Matthew, Ye, Jing Yong, Norris, Theodore B, Baker, Jr., James R., Balogh, Lajos P, Milas, Susanne M, Emelianov, Stanislav Y, & Hollman, Kyle W. Acoustic monitoring method and system in laser-induced optical breakdown (LIOB). United States.
O'Donnell, Matthew, Ye, Jing Yong, Norris, Theodore B, Baker, Jr., James R., Balogh, Lajos P, Milas, Susanne M, Emelianov, Stanislav Y, and Hollman, Kyle W. Tue . "Acoustic monitoring method and system in laser-induced optical breakdown (LIOB)". United States. doi:. https://www.osti.gov/servlets/purl/984344.
@article{osti_984344,
title = {Acoustic monitoring method and system in laser-induced optical breakdown (LIOB)},
author = {O'Donnell, Matthew and Ye, Jing Yong and Norris, Theodore B and Baker, Jr., James R. and Balogh, Lajos P and Milas, Susanne M and Emelianov, Stanislav Y and Hollman, Kyle W},
abstractNote = {An acoustic monitoring method and system in laser-induced optical breakdown (LIOB) provides information which characterize material which is broken down, microbubbles in the material, and/or the microenvironment of the microbubbles. In one embodiment of the invention, femtosecond laser pulses are focused just inside the surface of a volume of aqueous solution which may include dendrimer nanocomposite (DNC) particles. A tightly focused, high frequency, single-element ultrasonic transducer is positioned such that its focus coincides axially and laterally with this laser focus. When optical breakdown occurs, a microbubble forms and a shock or pressure wave is emitted (i.e., acoustic emission). In addition to this acoustic signal, the microbubble may be actively probed with pulse-echo measurements from the same transducer. After the microbubble forms, received pulse-echo signals have an extra pulse, describing the microbubble location and providing a measure of axial microbubble size. Wavefield plots of successive recordings illustrate the generation, growth, and collapse of microbubbles due to optical breakdown. These same plots can also be used to quantify LIOB thresholds.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 06 00:00:00 EDT 2008},
month = {Tue May 06 00:00:00 EDT 2008}
}

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