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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1993),
  • paper CTuN87

Picosecond Fourier-Kerr gated imaging in thick biomedical media

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Abstract

When an optical pulse propagates through a turbid medium, its temporal profile broadens due to the diffusive scattering. The nearly forward propagating light ballistic/snake component preserves its image information, while the diffusive component loses most of its information.1 Time-resolved techniques have been used to separate-out the ballistic/snake components from the diffusive component of light migration in turbid media. In this paper, we present the time and spatial-gated imaging measurements using a 4F Fourier-Kerr gate as shown in Fig. 1. The Kerr gate is located at the 2F location where the transmitted signal from a collimated incident laser pulse through a turbid medium located at the focal plane of the first lens ate spatial-filtered. Higher spatial frequencies will be removed from the time-gated images collected at the 4F image plane, and a significantly better S/N of the image is obtained.

© 1993 Optical Society of America

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