High speed determination of laser wavelength using Poincaré descriptors of speckle
Abstract
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.
Citation
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
Publication
Optics Communications
Status
Peer reviewed
ISSN
0030-4018Type
Journal article
Description
Funding: Leverhulme Trust Research Project Grant RPG-2017-197.Collections
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