INSTRUMENTATION FOR COHERENT DETECTION IN TURBID MEDIA

$13,842P41FY2000RRNIH

Massachusetts Institute Of Technology, Cambridge MA

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Abstract

We have conducted experiments using a newly developed setup for studying preservation of coherence in scattering media. This setup uses 150 femtosecond excitation pulses from Argon ion pumped mode locked Ti:sapphire laser system. Light is delivered through a scattering sample composed of polystyrene microspheres and mixed with a slightly tilted (0-20 mrad) reference beam. We were able to find relative contribution in coherent signal from photons that were scattered 1, 2, 3 etc times. This work can be of importance in developing system for imaging sub-surface structures in mucosal tissues.

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