Figure 7

The plot (a) shows the drift of the unlocked cavity with time and (b) is the measured VRS split of an unlocked cavity versus a locked cavity. We allowed the cavity to drift and the probe laser is continuously scanned across the resonant transition to obtain the VRS split at various times, each dot is the data of the VRS split averaged over 10 such scans. In the unlocked case, the fluctuations in the length of the cavity cause changes in resonant frequency and this introduces an unequal detuning between the atom and the cavity during the measurement cycle. In Fig. 7(a) we show the drift of the left and right peaks of the double peak structured VRS, the solid red plot shows the progression of the left peak without the lock, and the solid blue is the left peak with the cavity lock, the dotted red and blue shows the progression of the right peak without and with the cavity lock respectively. It can be observed that measured drifts in frequency for blue lines do not change with time. In Fig. 7(b) we show the VRS split observed for unlocked (red plot) and locked (blue plot). A consistent VRS split with a standard deviation of 0.83 MHz, when an active lock on the cavity is in place. The red dots are experimental data, The black solid line is the mean, and the light blue band shows the standard deviation