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Microcontroller-based locking in optics experiments

Abstract : Optics experiments critically require the stable and accurate locking of relative phases between light beams or the stabilization of Fabry-Perot cavity lengths. Here, we present a simple and inexpensive technique based on a stand-alone microcontroller unit to perform such tasks. Easily programmed in C language, this reconfigurable digital locking system also enables automatic relocking and sequential functioning. Different algorithms are detailed and applied to fringe locking and to low- and high-finesse optical cavity stabilization, without the need of external modulations or error signals. This technique can readily replace a number of analog locking systems advantageously in a variety of optical experiments.
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Contributor : Hanna Le Jeannic <>
Submitted on : Thursday, July 15, 2021 - 9:23:15 AM
Last modification on : Friday, July 16, 2021 - 3:37:38 AM


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K Huang, H Le Jeannic, J Ruaudel, O Morin, J Laurat. Microcontroller-based locking in optics experiments. Review of Scientific Instruments, American Institute of Physics, 2014, 85 (12), pp.123112. ⟨10.1063/1.4903869⟩. ⟨hal-03269656⟩



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