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The rise of interest in the study of quantum emitters has recently promptedmany research groups to construct their own confocal epifluorescencemicroscopy/spectroscopy instruments. The low light levels typically involved inquantum emitter measurements makes it critically important to account for anypotential sources of background fluorescence by components used within suchsetups. In this report, we show that emission originating from variousmicroscope objectives can possess elusive sharp linewidths that couldpotentially be mistaken for quantum emission. Impurities present in manyglasses overlap in wavelength with single photon emission from severalcandidate emitter systems of current interest. A careful consideration of thissystem noise could be critical to exploratory work of the optical properties ofmaterials such as transition metal dichalcogenides and hexagonal boron nitride.

Accounting for objective lens autofluorescence in quantum emitter measurements