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We have measured the frequency of the P(27) line of H12C14N 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 μm and also the most accurate measurement of a 1.5-μm optical frequency.
© 1995 Optical Society of America
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