Amplitude ambiguities in second-harmonic-generation frequency-resolved optical gating: comment.
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.
Xu
Lina
L
Georgia Institute of Technology, School of Physics, Atlanta, Georgia 30339, USA.
Kane
Daniel J
DJ
Trebino
Rick
R