In Opt. Lett.45, 5755 (2019)OPLEDP0146-959210.1364/OL.44.005755, a factor is missing in the result of Eq. (1). Thus, the width of the comb spectrum $ \Delta \nu $Δν becomes $ \Delta \nu = 2{\sqrt 3} \Gamma {\alpha _e} $Δν=23Γα.
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