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VIPA-based spectrometers have enabled rapid Brillouin spectrum measurementsand current designs of multi-stage VIPA spectrometers offer enough spectralextinction to probe transparent tissue, cells and biomaterials. However, inhighly scattering media or in the presence of strong back-reflections, such asat interfaces between materials of different refractive indices, VIPA-basedBrillouin spectral measurements are limited. While several approaches toaddress this issue have recently been pursued, important challenges remain.Here we have adapted the design of coronagraphs used for exosolar planetimaging to the spectral domain and integrated it in a double-stage VIPAspectrometer. We demonstrate that this yields an increase in extinction up to20dB, with nearly no added insertion loss. The power of this improvement isvividly demonstrated by Brillouin imaging close to reflecting interfaceswithout need of index matching or sample tilting

Integration of spectral coronagraphy within VIPA-based spectrometers for high extinction Brillouin imaging