2015 年 81 巻 9 号 p. 881-884
We have developed a laser frequency calibration system with an optical frequency comb linked to the national standard of frequency. The frequency standard oscillator for comb stabilization was synchronized to the coordinated universal time of national metrology institute of Japan (UTC(NMIJ)), and the residual error of its frequency was remotely calibrated. Thus, the comb frequency was traceable with respect to the national standard of frequency. Using the developed system, we measured the frequency of a 633nm iodine stabilized He-Ne laser that was previously calibrated by using the secondary standard based on the national primary standard of laser. The results obtained by using the comb were in a good agreement with those obtained by using the secondary standard of laser. To ensure measurement reliability, we measured the relative stability of the developed system with respect to the one developed by NMIJ. A relative frequency stability of 5.2×10-14 was obtained.
