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A list of accurate frequency measurements made on laser-based frequency standards in the 10 THz to 580 THz region is assembled and discussed. The list contains all known results with accuracy exceeding 3 parts in 10 9 with the added constraint for the 30 THz region that only those linked directly to the caesium standard are included. The frequencies of stabilized lasers recommended for the implementation of the 1983 definition of the metre are shown for comparison.
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D. J. E. Knight (1986) studied this question.
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