High speed determination of laser wavelength using Poincaré descriptors of speckle
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Laser speckle can provide a powerful tool that may be used for metrology, for example measurements of the incident laser wavelength with a resolution beyond that which may be achieved in a commercial device. However, to realise highest resolution requires advanced multi-variate analysis techniques, which limit the acquisition rate of such a wavemeter. Here we show an arithmetically simple method to measure wavelength changes with dynamic speckle, based on a Poincarè descriptor of the speckle pattern. We demonstrate the measurement of wavelength changes at femtometer-level with a measurement time reduced by two orders of magnitude compared to the previous state-of-the-art, which offers promise for applications such as speckle-based laser wavelength stabilisation.
O'Donnell , L , Dholakia , K & Bruce , G D 2020 , ' High speed determination of laser wavelength using Poincaré descriptors of speckle ' , Optics Communications , vol. 459 , 124906 . https://doi.org/10.1016/j.optcom.2019.124906
Copyright © 2019 Elsevier B.V. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1016/j.optcom.2019.124906
DescriptionFunding: Leverhulme Trust Research Project Grant RPG-2017-197.
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