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Spatial optical mode demultiplexing as a practical tool for optimal transverse distance estimation
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DOI：10.1364/OPTICA.404746.png)
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Abstract
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We present the experimental implementation of simultaneous spatial multimode demultiplexing as a distance measurement tool. We use this technique to estimate the distance between two incoherent beams in both directions of the transverse plane, and find a perfect accordance with theoretical predictions, given a proper calibration of the demultiplexer. We show that, even though sensitivity is limited by the cross-talk between channels, we can perform measurements in two dimensions much beyond the Rayleigh limit over a large dynamic range. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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