AUTLER-TOWNES EFFECT OF THE PHOTOEXCITED DIAMOND NITROGEN-VACANCY CENTER IN ITS TRIPLET GROUND-STATE

The Autler-Townes effect in nuclear magnetic resonance (NMR) and electron paramagnetic resonance has been observed using recently developed Raman heterodyne techniques. The measurements were carried out on the nitrogen-vacancy color center in diamond, where the 3A<->3E optical transition was driven by a single mode dye laser at 638 nm while the magnetic transitions in the 3A ground state were driven by two rf fields. The measured splittings in the NMR lines were found to be in good agreement with theoretical predictions. Using the Autler-Townes effect, the magnitude of the dipole moments of the m(I)=0<->+/- 1 (m(S)=0) transitions in the ground state was determined, and found to be the same. Comparison of this latter result with the NMR spectra shows that Raman heterodyne signal intensities are determined by population