Abstract
We reports improvements to our Sagnac effect matter-waveinterferometer gyroscope. This device now has a short-term rotation-ratesensitivity of 6×10-10 rad s-1 over 1 s ofintegration, which is the best publicly reported value to date. StimulatedRaman transitions are used to coherently manipulate atoms fromcounterpropagating thermal beams, forming two interferometers withopposite rotation phase shifts, allowing rotation to be distinguished fromacceleration and laser arbitrary phase. Furthermore, electronicallycompensating the rotation-induced Doppler shifts of the Raman lasersallows operation at an effective zero rotation rate, improving sensitivityand facilitating sensitive lock-in detection readout techniques. Long-termstability is promising but not yet fully characterized. Potentialapplications include inertial navigation, geophysical studies and tests ofgeneral relativity.
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