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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 16 — Aug. 15, 2010
  • pp: 2780–2782

Acousto-optic modulation by pulsed optical excitation: implications to imaging in turbid media

Joseph S. Paul, Deep Sen, and Socrates Dokos  »View Author Affiliations

Optics Letters, Vol. 35, Issue 16, pp. 2780-2782 (2010)

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We show that the transient response of acoustically modulated optical flux in a turbid medium irradiated by a pulsed point source of light is delayed in time relative to the light-alone flux obtained in the ab sence of acoustic modulation. The time delay is shown to result from an initial phase of flux reversal, as determined by the time point of the input pulse onset with reference to the ultrasound cycle. Both the time delay and amplitude of modulation are shown to be dependent on the effective attenuation coefficient of the medium. Application of a periodic train of excitation pulses spaced at equal intervals at, or in multiples of, the ultrasound period enables a time-locked detection of the modulated light, without the deleterious effects caused by speckle artifacts.

© 2010 Optical Society of America

OCIS Codes
(110.7050) Imaging systems : Turbid media
(110.7170) Imaging systems : Ultrasound
(170.0110) Medical optics and biotechnology : Imaging systems
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(110.0113) Imaging systems : Imaging through turbid media
(140.3538) Lasers and laser optics : Lasers, pulsed

ToC Category:

Original Manuscript: April 15, 2010
Manuscript Accepted: July 4, 2010
Published: August 13, 2010

Virtual Issues
Vol. 5, Iss. 13 Virtual Journal for Biomedical Optics

Joseph S. Paul, Deep Sen, and Socrates Dokos, "Acousto-optic modulation by pulsed optical excitation: implications to imaging in turbid media," Opt. Lett. 35, 2780-2782 (2010)

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