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NV in the dark (regime 3). (a) Shutter experiment in which we alternate between PLE scanning for 20 s and blocking the radiation for 60 s. When PLE scans are performed, the center frequency of the ZPL resonance is extracted from Voigt fits (gray dots). Here, a data set is exemplarily presented. (b) Occurrence of spectral shifts obtained from many data sets. The extracted spectral diffusion value for “Laser on” corresponds to the spanned frequency range recorded in a period of 20 s. The spectral diffusion for “Laser off” is extracted from the spectral difference of the last PLE scan before and the first scan after blocking the laser, as illustrated in panel (a). Credit: Physical Review X (2023). DOI: 10.1103/PhysRevX.13.011042