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The photophysics and charge state dynamics of the nitrogen vacancy (NV)center in diamond has been extensively investigated but is still not fullyunderstood. In contrast to previous work, we find that NV$^{0}$ converts toNV$^{-}$ under excitation with low power near-infrared (1064 nm) light,resulting in $increased$ photoluminescence from the NV$^{-}$ state. We used acombination of spectral and time-resolved photoluminescence experiments andrate-equation modeling to conclude that NV$^{0}$ converts to NV$^{-}$ viaabsorption of 1064 nm photons from the valence band of diamond. We report fastquenching and recovery of the photoluminescence from $both$ charge states ofthe NV center under low power 1064 nm laser excitation, which has not beenpreviously observed. We also find, using optically detected magnetic resonanceexperiments, that the charge transfer process mediated by the 1064 nm laser isspin-dependent.

Charge state dynamics of the nitrogen vacancy center in diamond under 1064 nm laser excitation