Date of this Version
PHYSICAL REVIEW LETTERS 114, 069301 (2015) ; 13 FEBRUARY 2015
In conclusion, we have shown that when the same definition for the HHG yield is used [cf. Eq. (1)], the results of Ref.  give the same scaling law found earlier in Refs. [2–5] for wavelengths λ ≤ 2 μm. We note that this latter scaling law can be obtained analytically by using results of the model developed in Ref.  for the description of short-pulse HHG spectra. These analytic results as well as new numerical TDSE results for longer wavelengths, λ ≤ 4 μm, will be published elsewhere.