Journal
OPTICS LETTERS
Volume 45, Issue 7, Pages 1926-1929Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.388960
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Funding
- Leverhulme Trust [RPG-2017-197]
- Engineering and Physical Sciences Research Council [EP/R004854/1, EP/P030017/1]
- EPSRC [EP/P030017/1, EP/R004854/1] Funding Source: UKRI
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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 1-m-long step-index multimode fiber and a fast camera. Independent wavelengths separated by as little as 1 fin are retrieved with 0.2 fin precision using principal component analysis. The method offers a viable way to measure sparse spectra containing multiple individual lines and may find application in the tracking of multiple lasers in fields such as quantum technologies and optical telecommunications. (C) 2020 Optical Society of America
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