Wavelength sensitivity of the speckle patterns produced by an integrating sphere

Morgan Facchin; Graham D. Bruce; Kishan Dholakia

doi:10.1117/12.2608676

9 March 2022 Wavelength sensitivity of the speckle patterns produced by an integrating sphere

Morgan Facchin, Graham D. Bruce, Kishan Dholakia

Proceedings Volume PC12017, Complex Light and Optical Forces XVI; PC120170M (2022) https://doi.org/10.1117/12.2608676
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

Speckle patterns are sensitive to wavelength variations, and can be used to measure such variations. Recently, a new way of producing speckles have been introduced, using an integrating sphere. Here, we derive a general model predicting the change occurring in a speckle pattern as a result of a generic transformation in this particular geometry. Applying this model to a wavelength variation, we show that the speckle sensitivity is mainly governed by two parameters: the radius and surface reflectivity of the sphere. We show analytically and experimentally that integrating spheres offer sensitivity four orders of magnitude above that of commonly-used multimode optical fibres offering excellent prospects for speckle metrology.

Conference Presentation

Citation Download Citation

Morgan Facchin, Graham D. Bruce, and Kishan Dholakia "Wavelength sensitivity of the speckle patterns produced by an integrating sphere", Proc. SPIE PC12017, Complex Light and Optical Forces XVI, PC120170M (9 March 2022); https://doi.org/10.1117/12.2608676

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