Pulsed frequency shifted feedback laser for accurate long distance measurements: Beat order determinationReport as inadecuate




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1 LIPhy - Laboratoire Interdisciplinaire de Physique Saint Martin d’Hères

Abstract : Long-distance measurements 10 m - 1000 m with an accuracy of 10-7 is achievable with Frequency Shifted Feedback FSF laser interferometry technique, provided that the determination of the radio frequency beat order be made without ambiguity and on a time scale compatible with atmospheric applications. Using the pulsed-FSF laser that we developed for laser guide star application, we propose and test a simple method for measuring the beat order in real time. The moving-comb and Yatsenko models are also discussed. The first of these models fails to interpret our long-distance interferometry results. We show that the accuracy of long-distance measurements depends primarily on the stabilization of the acoustic frequency of the modulator.





Author: J. P. Pique -

Source: https://hal.archives-ouvertes.fr/



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