Variable coherence in determining the scattering parameters of diffuse media using laser speckle

Summary form only given. We demonstrate the application of a variable-coherence laser source for determining the scattering parameters of a diffuse medium and the potential for imaging spatially-dependent scatter. A key concept in this work in the ability to synthesize a variable-coherence source by...

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Bibliographic Details
Main Authors: Webb, K.J., Webster, M.A., McKinnny, J.D., Weiner, A.M.
Format: Conference Proceeding
Language:English
Subjects:
Optical fibers
Optical noise
Optical refraction
Optical variables control
Optical waveguides
Refractive index
Scattering parameters
Speckle
Spontaneous emission
Stimulated emission
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Description
Summary:Summary form only given. We demonstrate the application of a variable-coherence laser source for determining the scattering parameters of a diffuse medium and the potential for imaging spatially-dependent scatter. A key concept in this work in the ability to synthesize a variable-coherence source by frequency modulating a tunable laser diode (with a center wavelength of 850 nm) at a rate much faster than the integration time of the detector. This allows for a rapid measurement and the adaption of laser coherence to the degree of scatter, which we show is critical in obtaining the necessary sensitivity.
DOI:10.1109/IQEC.2000.908169