title: Amplitude ambiguities in second-harmonic-generation frequency-resolved optical gating: comment.
abstract: The authors of an earlier paper [Opt. Lett. 32, 3558 (2007)] reported two "ambiguities" in second-harmonic-generation frequency-resolved optical gating (FROG). One ambiguity is simply wrong--a miscalculation. The other is well known and easily avoided in simple well-known FROG variations. Finally, the authors' main conclusion--that autocorrelation can be more sensitive to pulse variations than FROG--is also wrong.
authors.affiliation: Georgia Institute of Technology, School of Physics, Atlanta, Georgia 30339, USA.
authors.forename: Lina
authors.initials: L
authors.lastname: Xu
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Kane
authors.forename: Rick
authors.initials: R
authors.lastname: Trebino