Frequency comparison of two fiber-based frequency combs at 633 nm
ABSTRACT 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.
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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; · 1.71 Impact Factor