Reproducibility of Methane- and Iodine-Stabilized Optical Frequency Standards
Helium-neon lasers stabilized to the saturated of CH4 (3.39 um) or I2 (0.633um)exhibit a very high bility, reaching 5 parts in 1014 for the former and for the latter over observation times of a few tens Their reproducibility, on the other hand, is presently only about one part in 1011. Although this value is quite adequate for the contemplated use of these devices as length standards, it is far poorer than the reproducibility of the cesium beam primary frequency standard (10−13). Several laboratories have thus been led to undertake a systematic study of all possible limitations and associated physical problems. The present paper reports our recent results in this direction.
KeywordsMethyl Bromide Beat Note Hyperfine Component Stark Splitting Optical Frequency Standard
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