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| This integration is necessary because of the low light level extracted from the ring laser (10 nW) and the feedback jitter of the actively stabilized reference laser. A feedback system adjusts the pressure inside the vessel such that a constant cavity perimeter is maintained. Apart from isolating the cavity fromatmospheric pressure variations, we also compensate for small thermal expansions from the seasonal temperature cycle of the entire sensor structure. In addition to this, we also stabilize the relative power of the two counterpropagating intracavity beams via a feedback mechanism. This minimizes any possibility for nonreciprocal effects within the gain medium to introduce a systematic variation to the measured Sagnac frequency. |
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