用于频率传递的系留气球自由空间光链路
Free space optical link to a tethered balloon for frequency transfer
AI总结：
本文提出面向系留气球的自由空间光频率传递链路，采用Tip/Tilt跟踪与主动相位噪声补偿，在300米链路上实现16秒平均后8×10⁻¹⁹的分数频率稳定度。
摘要：
我们展示了一条通向位于300米高空的系留气球上角锥棱镜的光链路结果，其中包含用于气球跟踪的Tip/Tilt补偿。实验测量了1542 nm激光的载波相位，这是用于远距离时钟频率比对的有用信号。系统实现了载波的主动相位噪声补偿，证明在16秒平均后分数频率稳定度达到8×10⁻¹⁹，相比以往通过机载平台实现的最佳链路略有提升（约3倍）。这一先进水平结果由一套可快速现场部署的便携式装置获得。
英文摘要：
We present the results of an optical link to a corner cube on board a tethered balloon at 300 m altitude including a Tip/Tilt compensation for the balloon tracking. Our experiment measures the carrier phase of a 1542 nm laser, which is the useful signal for frequency comparison of distant clocks. An active phase noise compensation of the carrier is implemented, demonstrating a fractional frequency stability of 8x10-19 after 16 s averaging, which slightly (factor ~3) improves on best previous links via an airborne platform. This state-of-the-art result is obtained with a transportable set-up that enables a fast field deployment.
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