Femtometer-resolved simultaneous measurement of multiple laser wavelengths in a speckle wavemeter
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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.
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
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
DescriptionFunding: Leverhulme Trust (RPG-2017-197); EPSRC (EP/R004854/1, EP/P030017/1).
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