Abstract
Photoluminescence excitation spectroscopy of nitrogen vacancy (NV) centers in type Ib diamond nanocrystals shows that in spite of spectral diffusion and spin-nonconserving transitions, zero-phonon linewidth as small as $16\phantom{\rule{0.3em}{0ex}}\mathrm{MHz}$, which is nearly lifetime limited, can be observed at low temperature. Relatively small effects of spectral diffusion have also been observed in a small fraction of NV centers.
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