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Experimental Demonstration of the Impact of theFringe Shape in Sub-Lambda / 2 Sensing With OpticalFeedback Interferometry

Abstract : It is established in the Optical Feedback Interferometry (OFI) theory that the shape of the interferometric fringe has an impact on the detector's response to very small displacement measurements. In this paper we validate-for the first time based on experimental results-this statement by comparing experiments to an established model implementation. Through these experiments we show that the amplitude of the signals induced by sub-lambda/2 optical path variations is linearly dependent on the slope of the underlying fringe. Thus, careful control of the phase allows us to maximize the detection amplitude of very small displacements by positioning the phase where the fringe slope is the steepest. These results are directly applicable to established OFI applications that measure sub-lambda/2 optical path variations, such as OFI vibrometers or acoustic imaging though the acousto-optic effect.
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https://hal.laas.fr/hal-03040615
Contributor : Einar Knudsen <>
Submitted on : Friday, December 4, 2020 - 2:20:53 PM
Last modification on : Thursday, June 10, 2021 - 3:06:20 AM
Long-term archiving on: : Friday, March 5, 2021 - 7:05:28 PM

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Einar Knudsen, Julien Perchoux, Thierry Mazoyer, José Imas, Mengkoung Veng, et al.. Experimental Demonstration of the Impact of theFringe Shape in Sub-Lambda / 2 Sensing With OpticalFeedback Interferometry. Applied optics, Optical Society of America, 2021, 60 (1), pp.119-124. ⟨10.1364/AO.411103⟩. ⟨hal-03040615⟩

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