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 showed high performance. However, to our knowledge, complete characterisation sensitivity that geometry not performed date. In this work, we derive general model predicting variation pattern as result generic transformation. Applying shift incident wavelength, show mainly governed radius surface reflectivity sphere. We spheres offer four orders magnitude above multimode fibres similar size, discuss analogies with transmission profile Fabry–Pérot interferometer.