Green illumination reversibly quenches second-harmonic generation in a diamond microdisk because nitrogen-vacancy centers switch from a charged to a neutral state, showing that diamond's effective nonlinearity can be optically controlled.
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Optical Switching of $\chi^{(2)}$ in Diamond Photonics
Green illumination reversibly quenches second-harmonic generation in a diamond microdisk because nitrogen-vacancy centers switch from a charged to a neutral state, showing that diamond's effective nonlinearity can be optically controlled.