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We report measurements of the optical properties of the 1042 nm transition of negatively charged nitrogen-vacancy (NV) centers in type-1b diamond. The results indicate that the upper level of this transition couples to the mₒ=1 sublevels of the ^3E excited state and is short lived with a lifetime of 1 ns. The lower level is shown to have a temperature-dependent lifetime of 462 (10) ns at 4. 4 K and 219 (3) ns at 295 K. The light-polarization dependence of 1042 nm absorption confirms that the transition is between orbitals of A₁ and E character. The results shed light on the NV level structure and optical pumping mechanism.
Acosta et al. (Wed,) studied this question.
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