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—Progress on the development of a frequency chain devoted to the absolute frequency measurement of 127 I 2-stabilized lasers around 563.2 THz/532 nm is reported. The aim of this work is the improvement of the accuracy—by at least one order of mag-nitude—of the absolute frequency of this standard. The scheme is based on the frequency combination of two… (More)

|An absolute frequency measurement of a CO 2 =OsO 4 secondary frequency standard, operating in the mid infrared, is reported. A brief description of the measurement chain linking this standard to a hydrogen maser evidences the critical points. The measured frequency stability shows that the measurement system reaches the icker oor of the frequency standard,… (More)

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