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We demonstrated for the first time the characterization of absolute frequencystability of three reference cavities by cross beating three laser beams whichare independently locked to these reference cavities. This method shows theindividual feature of each reference cavity, while conventional beatnotemeasurement between two cavities can only provide an upper bound. This methodallows for numerous applications such as optimizing the performance of thereference cavity for optical clockwork.

Characterization of the absolute frequency stability of an individual reference cavity