Self-Alignment of a Large-Area Dual-Atom-Interferometer Gyroscope Using Parameter Decoupled Phase Seeking Calibrations

TL;DR

This paper demonstrates a highly sensitive dual-atom-interferometer gyroscope with precise laser alignment and phase calibration, achieving excellent stability and sensitivity for absolute rotation measurements.

Contribution

It introduces a novel phase seeking calibration method for large-area dual-atom interferometers, enabling precise alignment and improved inertial rotation sensing.

Findings

Sensitivity of 1.5×10⁻⁷ rad/s/Hz^{1/2}

Stability of 9.5×10⁻¹⁰ rad/s at 23000 s

Successful absolute rotation measurement through atomic velocity adjustment

Abstract

We realize a Mach-Zehnder-type dual-atom-interferometer gyroscope with an interrogation arm of 40 cm length and the interference area up to 1.2 cm$^2$. The precise angular alignment of the large-scale separated Raman lasers is demonstrated by seeking the phase intersection of Ramsey-Bord$\acute{e}$ interferometers after the gravity effect is compensated and by decoupling the velocity dependent crosstalk phase shifts, and applied to build the Mach-Zehnder atom interferometer. Then a compact inertial rotation sensor is realized based on dual large-area Mach-Zehnder atom interferometers by precisely aligning the large-scale separated Raman lasers, in which the coherence is well preserved and the common noise is differentially suppressed. The sensor presents a sensitivity of $1.5\times10^{-7}$ rad/s/Hz$^{1/2}$, and a stability of $9.5\times10^{-10}$ rad/s at 23000 s. The absolute rotation measurement is carried out by adjusting the atomic velocity which corresponds to modulating the scale factor.