Wavelength sensitivity of the speckle patterns produced by an integrating sphere
Abstract
Speckle metrology is a powerful tool in the measurement of wavelength and spectra. Recently, speckle produced by multiple reflections inside an integrating sphere has been proposed and showed high performance. However, to our knowledge, a complete characterisation of speckle sensitivity to wavelength in that geometry has not been performed to date. In this work, we derive a general model predicting the variation in a speckle pattern as a result of a generic transformation. Applying this to a shift in the incident wavelength, we show that the speckle sensitivity is mainly governed by the radius and surface reflectivity of the sphere. We show that integrating spheres offer sensitivity four orders of magnitude above that of multimode fibres of a similar size, and discuss analogies with the transmission profile of a Fabry–Pérot interferometer.
Citation
Facchin , M , Dholakia , K & Bruce , G D 2021 , ' Wavelength sensitivity of the speckle patterns produced by an integrating sphere ' , Journal of Physics: Photonics , vol. 3 , no. 2 , 035005 . https://doi.org/10.1088/2515-7647/ac107a
Publication
Journal of Physics: Photonics
Status
Peer reviewed
ISSN
2515-7647Type
Journal article
Description
Funding: Leverhulme Trust (RPG-2017-197) and the UK Engineering and Physical Sciences Research Council (EP/P030017/1).Collections
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