26 April 1995 Long-term frequency stability of three absolutely referenced lasers at 1547.8 nm located at different places which were separated by 30 km
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Abstract
The relative optical frequency stabilities of three optical reference units at 1547.82 nm were examined. The reference units were located at different places in Berlin and connected via several km of optical fiber. The three optical signals were heterodyned to measure the frequency stabilities, which were better than 2*10$=-11) (2.5 KHz).
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Ulrich H.P. Fischer, Andreas Gladisch, L. Giehmann, Clemens von Helmolt, Manfred Rocks, "Long-term frequency stability of three absolutely referenced lasers at 1547.8 nm located at different places which were separated by 30 km", Proc. SPIE 2378, Laser Frequency Stabilization and Noise Reduction, (26 April 1995); doi: 10.1117/12.208233; https://doi.org/10.1117/12.208233
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