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Pulsed laser excitation causes the luminescence of Nitrogen Vacancy centersin diamond to unexpectedly decrease with increasing pulse energy. This decreaseis observed in both the negatively charged and neutral centers and is caused byshortening of the luminescence lifetimes of the centers of both types. Indarkness, the luminescence does not show any recovery on a time scale of 10microseconds but as little as three low-intensity pulses can return theluminescence to its previous, brighter state. An external magnetic fieldreduces the magnitude of the effect. A possible mechanism for these phenomenabased on optical polarisation and depolarisation of an electronic spin isproposed.

Optically Induced Polarization and Depolarization of an Electron Spin in a Nitrogen-Vacancy Center of Diamond Nano-crystals