Two fiber-based frequency combs were compared at 633 nm. An offset laser was locked to a frequency comb, and the locked laser was measured with another comb. Consequently, the frequency uncertainty of the combs was less than 3 times 10-16 at 10 000 s averaging, which is sufficiently lower than the uncertainty of UTC.
"Recently, one of the fiber combs developed by the National Metrology Institute of Japan (NMIJ) was shipped to the National Measurement Institute, Australia (NMIA) to validate the measurement capability of the fiber combs of NMIA and NMIJ at 633 nm . "
[Show abstract][Hide abstract] ABSTRACT: A fiber-based frequency comb has been developed to measure the frequency of a 633-nm iodine-stabilized laser at the National Metrology Institute of Japan (NMIJ). The measured frequency was consistent with the previous results measured with a Ti:sapphire-based comb. The NMIJ comb was shipped to Australia for the validation of the measurement capability of the National Measurement Institute, Australia (NMIA) and NMIJ combs using a common microwave reference and a common optical frequency. Consequently, the frequency consistency of the two combs was approximately 8 times10<sup>-17</sup>. Furthermore, we demonstrate that an absolute mode number of the comb can easily and clearly be determined by using the two combs.
IEEE Transactions on Instrumentation and Measurement 05/2009; 58(4-58):1234 - 1240. DOI:10.1109/TIM.2008.2008589 · 1.79 Impact Factor
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