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Figure 1 | EPJ Quantum Technology

Figure 1

From: Longitudinal spin relaxation in nitrogen-vacancy ensembles in diamond

Figure 1

NV \(\pmb{^{-}}\) energy levels and confocal microscopy setup. (a) Energy level scheme of the NV center in diamond. Green arrow marks the excitation by a 532 nm laser beam, the red arrow represents the optical transitions involved in the zero phonon line (637 nm), the brown arrow represents the nonradiative transition, the black double arrow indicates the MW transitions, while the broken arrows symbolize the intersystem transitions (arrow thicknesses mimics the transition strengths). (b) Confocal setup, D marks the NV diamond sample, MW the microwave stripline, DM the dichroic mirror, L the green laser, F the red filter, and PD the photodiode.

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