Figure 6.

(a) Unshielded raw OMG photodiode signal as output by the OPM electronics and recorded using an oscilloscope. (b) Amplitude noise spectral densities (ANSD) of the raw OMG analog output: blue—normal operation; red—pump laser always off; black—OMG unpowered. The data used for the calculation of the ANSD were recorded $100 \mathsf{\mu }\mathrm{s}$ to $700 \mathsf{\mu }\mathrm{s}$ after the pump pulse.