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Femtometer-resolved simultaneous measurement of multiple laser wavelengths in a speckle wavemeter

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Author_accepted.pdf (897.2Kb)
Date
01/04/2020
Author
Bruce, Graham D.
O'Donnell, Laura
Chen, Mingzhou
Facchin, Morgan
Dholakia, Kishan
Keywords
DAS
Metadata
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Abstract
Many areas of optical science require an accurate measurement of optical spectra. Devices based on laser speckle promise compact wavelength measurement, with attometer-level sensitivity demonstrated for single wavelength laser fields. The measurement of multimode spectra using this approach would be attractive, yet this is currently limited to picometer resolution. Here, we present a method to improve the resolution and precision of speckle-based multi-wavelength measurements. We measure multiple wavelengths simultaneously, in a device comprising a single 1m-long step-index multimode fiber and a fast camera. Independent wavelengths separated by as little as 1 fm are retrieved with 0.2 fm precision using Principal Component Analysis. The method offers a viable way to measure sparse spectra containing multiple individual lines and is likely to find application in the tracking of multiple lasers in fields such as portable quantum technologies and optical telecommunications.
Citation
Bruce , G D , O'Donnell , L , Chen , M , Facchin , M & Dholakia , K 2020 , ' Femtometer-resolved simultaneous measurement of multiple laser wavelengths in a speckle wavemeter ' , Optics Letters , vol. 45 , no. 7 , pp. 1926-1929 . https://doi.org/10.1364/OL.388960
Publication
Optics Letters
Status
Peer reviewed
DOI
https://doi.org/10.1364/OL.388960
ISSN
0146-9592
Type
Journal article
Rights
Copyright © 2020 Optical Society of America. 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/10.1364/OL.388960
Description
Funding: Leverhulme Trust (RPG-2017-197); EPSRC (EP/R004854/1, EP/P030017/1).
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/21660

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