双零差读出无源光学陀螺
Passive optical gyroscope with double homodyne readout
摘要：
我们提出了一个被动的，谐振，单频陀螺仪的设计，利用光学腔的偏振模式读出旋转和产生激光频率判别。该设计以其简单性而著称，不需要调制电子器件或频率计数器。我们从两束偏振方向正交的光束中同时提取了腔长信号和旋转信号。该读出方案可以应用于其偏振本征模经历不同相移的光学腔，例如光纤环、回音壁模式谐振器和折叠自由空间腔。我们将这种技术应用于无源自由空间陀螺仪，并实现了0.03度/小时的偏置稳定性和1 Hz以上的$5 \times 10^{-8}$ rad/sqHz的灵敏度，腔面积为400 cm ^2，精细度为10^4。低于1Hz时，陀螺仪的灵敏度受到光学腔中的反向散射和激光束的光束抖动的限制。
英文摘要：
We present a passive, resonant, single-frequency gyroscope design that utilises polarisation modes of an optical cavity to readout rotation and generate a laser frequency discriminant. This design is notable for its simplicity, requiring no modulation electronics or frequency counters. We extract both the cavity length signal and rotation signal from two co-propagating beams with orthogonal polarisations. This readout scheme can be applied to an optical cavity whose polarisation eigen-modes experience different phase shifts such as fibre rings; whispering gallery mode resonators; and folded free-space cavities. We apply this technique to the passive free-space gyroscope and achieve a bias stability of 0.03 degree/h and a sensitivity of $5 \times 10^{-8}$ rad/sqHz above 1 Hz, with a cavity of area 400 cm^2 and finesse of 10^4. Below 1 Hz the sensitivity of the gyroscope is limited by the backscattering in the optical cavity and beam jitter of the laser beam.
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