Fig. 2. The ODMR spectra of VSi defects under Stokes and AS excitation at zero external magnetic field.
a Two representative Stokes and AS excited ODMR signals with different laser powers at room temperature (297.2 K). The lines are fitted using Lorentzian functions. b, c Comparison of Stokes and AS excited ODMR contrast and full width half maximum (FWHM) as a function of laser power, respectively. d Two representative Stokes and AS excited ODMR signals with different MW powers (Rabi frequencies) at room temperature (297.2 K). e, f Measurement of Stokes and AS excited ODMR contrast and FWHM as a function of Rabi frequency, respectively. g ZFS of VSi defects under Stokes and AS excitation as a function of temperature. h, i, Comparison of Stokes and AS excited ODMR contrast and FWHM with respect to the temperature. Error bars represent the standard deviations of the corresponding fittings.