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In July 2009, the national standard tool for measuring length in Japan changed from an iodine-stabilized helium-neon (He-Ne) laser to a femtosecond optical frequency comb (FOFC). Owing to the outstanding frequency stability of the FOFC, in the near-future General Conference of Weights and Measures (Conférence générale des poids et measures: CGPM), the FOFC is expected as a new standard tool for...
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