title: Ultrashort pulse characterisation with SHG collinear-FROG.
abstract: We outline criteria for fast and accurate acquisition of collinear FROG (CFROG) trace and how it can be transformed into the more traditional noncollinear FROG trace. The CFROG has an intrinsically simple geometry that provides greater versatility as well as the ability for built-in delay calibration and enhanced error-checking. The procedure, based on data processing, allows conventional SHG-FROG retrieval algorithms to be used. This technique is tested numerically and experimentally giving excellent results. This work represents an attractive alternative to the traditional, more complex non-collinear FROG technique while, at the same time, extending its use to experiments where collinear geometry is imposed.
authors.forename: Ivan
authors.initials: I
authors.lastname: Amat-Roldán
authors.forename: Iain
authors.initials: I
authors.lastname: Cormack
authors.forename: Pablo
authors.initials: P
authors.lastname: Loza-Alvarez
authors.forename: Emilio
authors.initials: E
authors.lastname: Gualda
authors.forename: David
authors.initials: D
authors.lastname: Artigas