Abstract
A speckle-correlation method for determining the dispersion of short optical fibers and phase delays in multiply scattering bulk media is described. This method is based on measurements of the deterministic transverse dynamics of speckle structures in the output radiation of fibers or stationary scattering media upon tuning of the laser-radiation frequency. The range of measurements of phase delays is inversely proportional to the laser-radiation deviation and depends linearly on the fiber length or thickness of the scattering medium. Probing with radiation of tunable single-frequency quantum-dimensional laser diodes (λ = 635 nm and Δν = c/2Ln ≈ 130 GHz) and solid-state microlasers (YAG:Nd, λ = 532 nm and Δν = c/2Ln ≈ 84 GHz) allowed the dispersion to be determined in multimode (D = 50 μm and NA = 0.2) fibers with a minimum length <1 m and low-mode (D = 9 μm and NA = 0.17) fibers with a length of ∼20m. The use of digital video cameras for recording scattered speckle fields during probing of fluoroplastic phantoms with a thickness of <2 cm allowed measurements of phase delays during laser frequency tuning with a deviation of several tens of gigahertz. This technique can serve as the basis for developing coherent optical tomographs.
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Original Russian Text © G.G. Akchurin, A.G. Akchurin, 2006, published in Pribory i Tekhnika Eksperimenta, 2006, No. 4, pp. 110–115.
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Akchurin, G.G., Akchurin, A.G. A speckle-correlation method for determining the dispersion of optical fibers and scattering parameters in optically inhomogeneous media using lasers with frequency deviation. Instrum Exp Tech 49, 553–558 (2006). https://doi.org/10.1134/S002044120604018X
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DOI: https://doi.org/10.1134/S002044120604018X