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Proceedings Paper

Wigner phase space distribution and coherence tomography
Author(s): John E. Thomas; Frank Reil; Kim Fook Lee; Adam Wax; Samir Bali
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Paper Abstract

We demonstrate the measurement of path-length-resolved optical phase space distributions as a new framework for exploring the evolution of optical coherence in a turbid medium. This method measures joint transverse position and momentum (i.e., angle) distributions of the optical field, resolved by optical path length in the medium. The measured distributions are related to the Wigner phase space distribution function of the optical field, and can provide complete characteristics of the optical coherence in multiple scattering media. Optical phase space distributions are obtained as contour plots which enable a visual as well as quantitative method of characterizing the spatial coherence properties and wavefront curvature of the input and scattered fields. By using a broad-band source in a heterodyne detection scheme, we observe transmission and backscatter resolved by path length in the random medium, effectively providing timing resolution. New two-window heterodyne detection methods permit independent control of position and momentum resolution with a variance product that surpasses the uncertainty limit associated with Fourier transform pairs. Hence, high position and angular resolution can be simultaneously achieved. These techniques may provide new venues for using optical coherence in medical imaging.

Paper Details

Date Published: 14 April 2000
PDF: 9 pages
Proc. SPIE 3927, Optical Pulse and Beam Propagation II, (14 April 2000); doi: 10.1117/12.382047
Show Author Affiliations
John E. Thomas, Duke Univ. (United States)
Frank Reil, Duke Univ. (United States)
Kim Fook Lee, Duke Univ. (United States)
Adam Wax, Duke Univ. (United States)
Samir Bali, Duke Univ. (United States)


Published in SPIE Proceedings Vol. 3927:
Optical Pulse and Beam Propagation II
Yehuda B. Band, Editor(s)

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