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Ranging with frequency-shifted feedback lasers: from \(\upmu\)m-range accuracy to MHz-range measurement rate

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Abstract

We report results on ranging based on frequency-shifted feedback (FSF) lasers with two different implementations: (1) An Ytterbium-fiber system for measurements in an industrial environment with accuracy of the order of 1 \(\upmu \hbox {m}\), achievable over a distance of the order of meters with potential to reach an accuracy of better than 100 nm; (2) A semiconductor laser system for a high rate of measurements with an accuracy of 2 mm @ 1 MHz or 75 \(\upmu \hbox {m}\) @ 1 kHz and a limit of the accuracy of \(\ge\)10 \(\upmu \hbox {m}\). In both implementations, the distances information is derived from a frequency measurement. The method is therefore insensitive to detrimental influence of ambient light. For the Ytterbium-fiber system, a key feature is the injection of a single-frequency laser, phase modulated at variable frequency \(\varOmega\), into the FSF-laser cavity. The frequency \(\varOmega _\mathrm{{max}}\) at which the detector signal is maximal yields the distance. The semiconductor FSF-laser system operates without external injection seeding. In this case, the key feature is frequency counting that allows convenient choice of either accuracy or speed of measurements simply by changing the duration of the interval during which the frequency is measured by counting .

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Acknowledgements

We acknowledge support from the German “Bundesministerium für Bildung und Forschung” (BMBF) under the projects numbered 13-N-9345 and 13-N-9346. K.B. acknowledges additional support from the research center OPTIMAS of the state of Rhineland-Palatinate. We also thank B.W.Shore for carefully reading the manuscript.

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Author notes

  1. V. V. Ogurtsov

    Present address: , Zollamstr. 45, 67663, Kaiserslautern, Germany

  2. J. I. Kim

    Present address: Defense R&D Center, Hanwha Corporation, 99 Oesam-ro, Yuseong-gu, Daejeon, 305-156, Korea

Authors and Affiliations

  1. Department of Physics, Technical University Kaiserslautern, 67653, Kaiserslautern, Germany

    J. I. Kim, V. V. Ogurtsov & K. Bergmann

  2. SPHERON-VR AG, Hauptstrasse 186, 67714, Waldfischbach-Burgalben, Germany

    G. Bonnet

  3. Institute of Physics, National Academy of Sciences of Ukraine, Prospect Nauki 46, 03028, Kyiv, Ukraine

    L. P. Yatsenko

  4. OPTIMAS Research Center, Technical University Kaiserslautern, 67653, Kaiserslautern, Germany

    K. Bergmann

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Correspondence to L. P. Yatsenko.

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This article is part of the topical collection “Enlightening the World with the Laser” - Honoring T. W. Hänsch guest edited by Tilman Esslinger, Nathalie Picqué, and Thomas Udem.

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Kim, J.I., Ogurtsov, V.V., Bonnet, G. et al. Ranging with frequency-shifted feedback lasers: from \(\upmu\)m-range accuracy to MHz-range measurement rate. Appl. Phys. B 122, 295 (2016). https://doi.org/10.1007/s00340-016-6567-9

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