The frequency of a wavelength standard at 1542 nm (194 THz) developed in CMI for the telecommunication band C was measured with a fiber femtosecond frequency comb. The measurement was done for three transitions of acetylene 13C2H2: P(14), P(15) and P(16). The results agree well with values in the recommendation for Practical realization of the definition of the metre  and even better with recent measurements made in NMIJ/AIST [2,3] - the differences are lower than 2 kHz (or 1×10-11 rel.) for all three transitions. This agreement is significant considering the fact that the CMI laser uses an extremely simple spectroscopic arrangement and substantially lower saturation power.
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