Absolute-frequency measurement of an acetylene-stabilized laser locked to the P(16) transition of 13C2H2 using an optical-frequency comb

In order to establish the national frequency standards for the Korea Research Institute of Standards and Science in the 1.5-mu m region, we have developed an acetylenestabilized laser diode locked to the P(16) transition of (C2H2)-C-13. We then measured its absolute frequency using an optical-frequency comb based on a mode-locked Ti:sapphire laser whose repetition frequency and carrier-envelope offset frequency were phase locked to an H-maser. The measured absolute frequency of the laser diode locked to the P(16) transition Of (C2H2)-C-13 was 194369569386.0 kHz, with an uncertainty of 0.3 kHz, based on the measurements of a single system. Including the contribution of the residual offset, the uncertainty was 1.9 kHz.