大面积双原子干涉陀螺仪参数解耦寻相自对准
Self-Alignment of a Large-Area Dual-Atom-Interferometer Gyroscope Using Parameter Decoupled Phase Seeking Calibrations
摘要：
我们实现了一个马赫-曾德尔型双原子干涉仪陀螺仪，具有一个40厘米长的询问臂和干涉面积达1.2厘米$^2$。通过补偿重力效应后寻找Ramsey-Bord $\acute{e}$干涉仪的相位交叉点，并通过解耦速度相关的串扰相移，实现了大尺度分离拉曼激光器的精确角度对准，并应用于马赫-曾德尔原子干涉仪的搭建。然后，通过对大尺度分离拉曼激光器的精确对准，实现了基于双大面积马赫-曾德尔原子干涉仪的小型惯性旋转传感器，在保持相干性的同时差分抑制了共噪声。该传感器的灵敏度为$1.5\times10^{-7}$ rad/s/Hz $^{1/2}$，在23000 s时的稳定性为$9.5\times10^{-10}$ rad/s。绝对旋转测量是通过调节原子速度来实现的，这与调制标度因子相对应。
英文摘要：
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.
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