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-mum region, we have developed an acetylene-stabilized laser diode locked to the P(16) transition of13C2H2. 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 of13C2H2was 194 369 569 386.0 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