We have measured the frequency of the P(27) line of H(12)C(14)N at 1556 nm, using the 778-nm two-photon transition of Rb as a frequency reference. The measured frequency was 192, 622, 446.9 +/- 0.1 MHz. We believe that this experiment is the first absolute frequency measurement of a laser stabilized to a saturation dip at 1.5 microm and also the most accurate measurement of a 1.5-microm optical frequency.
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Awaji et al. (1995) studied this question.
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