Journal
OPTICS LETTERS
Volume 31, Issue 10, Pages 1537-1539Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.31.001537
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We consider the problem of measurement of optical transverse profile parameters and their conjugate variable. Using multimode analysis, we introduce the concept of detection noise modes. For Gaussian beams, displacement and tilt are a pair of transverse-profile conjugate variables. We experimentally demonstrate the optimal encoding and detection of these variables with a spatial homodyning scheme. Using higher-order spatial mode squeezing, we show the sub-shot-noise measurements for the displacement and tilt of a Gaussian beam. (c) 2006 Optical Society of America.
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