Abstract
In this study we measure the spatial broadening as a function of time of a collimated point source that impinges upon a slab of turbid material. The imaging system we utilize is based on the coherently amplified raman polarization (CARP) gate described elsewhere1 and shown schematically in Fig. 1. This imaging system, in its present configuration, has a temporal resolution of 250 fs, a spatial resolution of 0.6 mm, a field of view of 10 mm, and a detection threshold of about one photon in 1010 launched per pixel. We performed this study to explore the validity of our previous theoretical work,2 which predicts that there may be some limited regimes of sample and imaging system characteristics for which one can obtain better resolution than that predicted by the diffusion equation. For reference, we have recently shown3 that this diffusion limit for the 1/e point of the best-achievable PSF, is about 0.2 d, where d is the sample thickness, and is essentially independent of the material properties and the input photon number.
© 1995 Optical Society of America
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