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We present the results of an optical link to a corner cube on board atethered balloon at 300 m altitude including a Tip/Tilt compensation for theballoon tracking. Our experiment measures the carrier phase of a 1542 nm laser,which is the useful signal for frequency comparison of distant clocks. Anactive phase noise compensation of the carrier is implemented, demonstrating afractional frequency stability of 8x10-19 after 16 s averaging, which slightly(factor ~3) improves on best previous links via an airborne platform. Thisstate-of-the-art result is obtained with a transportable set-up that enables afast field deployment.

Free space optical link to a tethered balloon for frequency transfer