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    ?Proposal for phase-sensitive heterodyne detection in large-scale passive resonant gyroscopes

    作者: 来源: 发布时间:2021年04月02日 14:37 点击次数:[]

    Proposal for phase-sensitive heterodyne detection in large-scale passive resonant gyroscopes

    Zongyang Li, Kui Liu, Jing Liu, Zehuang Lu, and Jie Zhang

    Large-scale passive resonant gyroscopes (PRGs) have been utilized in the measurement of Earth rotation. We report on a scheme of phase-sensitive heterodyne detection in large-scale PRGs. By injecting three separated beams into different longitudinal modes of the ring cavity and self-demodulating the detected signals, the backscattering disturbance and the cavity length fluctuation effect both can be isolated. With the implementation of this new scheme, we can obtain the Earth rotation signal with a Sagnac frequency that is twice of that of the traditional scheme, which enhance the equivalent scale factor of the laser gyroscopes. On the other hand, the quantum noise limit of the instrument can also be further suppressed due to the improvement of the signal-to-noise ratio. With this new scheme, the theoretical rotational sensitivity of a 3 m?×?3 m large scale PRG can be as low as 10?12 rad/s/Hz??√. With this rotational sensitivity, the measurement of the length of day or the test of the general relativity can be realized.

    期刊名: Optics Express

    /:29

    页码:9737-9748

    发表时间:2021

    DOI: https://doi.org/10.1364/OE.415916



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