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Table 2

The expanded uncertainty sources values involving in the measurement of frequency laser.

Uncertainty budget U (k = 2)
uσ (comb stability) 1.9 × 10−13
uCs (24 h) 0.3 × 10−13
ucomb 2.0 × 10−13
ubeat (Tesa RSD/SR) 6.1 × 10−10
ubeat (HP5517D) 2.1 × 10−09
ubeat (HP5519A) 2.2 × 10−09

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