Two-photon infrared excitation pumps diamond NV centers into the non-fluorescent 4A2 quartet state of NV0, explaining photoluminescence quenching in intense infrared fields.
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Nonlinear optical charge state switching and pumping to a diamond NV center dark state
Two-photon infrared excitation pumps diamond NV centers into the non-fluorescent 4A2 quartet state of NV0, explaining photoluminescence quenching in intense infrared fields.