Calibration of atomic trajectories in a large-area dual-atom-interferometer gyroscope

TL;DR

This paper introduces a calibration method for atomic trajectories in a large-area dual-atom-interferometer gyroscope, enhancing measurement accuracy and stability for Earth rotation sensing.

Contribution

It presents a novel calibration technique for atomic trajectories that improves symmetry and alignment, boosting the gyroscope's immunity to gravity effects and phase noise.

Findings

Achieved a sensitivity of 1.2×10⁻⁶ rad/s/√Hz.

Demonstrated long-term stability of 6.2×10⁻⁸ rad/s at 2000 seconds.

Optimized atomic trajectory calibration enhances measurement precision.

Abstract

We propose and demonstrate a method for calibrating atomic trajectories in a large-area dual-atom-interferometer gyroscope. The atom trajectories are monitored by modulating and delaying the Raman transition, and they are precisely calibrated by controlling the laser orientation and the bias magnetic field. To improve the immunity to the gravity effect and the common phase noise, the symmetry and the overlapping of two large-area atomic interference loops are optimized by calibrating the atomic trajectories and by aligning the Raman-laser orientations. The dual-atom-interferometer gyroscope is applied in the measurement of the Earth rotation. The sensitivity is $1.2\times10^{-6}$ rad/s/$\sqrt{Hz}$, and the long-term stability is $6.2\times10^{-8}$ rad/s $@$ $2000$ s.