For citation:
Vacas-Jacque P., Ryabukho V. P., Strojnik M., Tuchin V. V., Paez G. Ballistic Auto-Correlation Interferometry. Izvestiya of Saratov University. Physics , 2009, vol. 9, iss. 2, pp. 3-13. DOI: 10.18500/1817-3020-2009-9-2-3-13
Ballistic Auto-Correlation Interferometry
We propose the implementation of a ballistic auto-correlation interferometer (BAI) for the assessment of biological tissues. We develop the theory of the interferometric technique, and demonstrate that a method to isolate ballistic from forward-scattered contributions is of central importance. We, therefore, propose theoretically and experimentally a non-linear grating-based angular filter. A monochromatic source incident on a ruled grating, positioned at grazing diffraction, is followed by a narrow slit to conform the proposed system. We validate the angular amplification experimentally, with values ranging on the order of 10-20X. In addition, similar values of transversal beam size reduction, provide an efficient -100X filtering scheme. As a preliminary study for the implementation of the BAI, we compare two transillumination schemes, which include and exclude the grating-based angular filter. Our preliminary results are encouraging, and indicate that the filter effectively isolates the information needed in the BAI.
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