title: A regression technique to analyze the second-order nonlinear optical response of thin films.
abstract: We present a new technique, based on regression analysis, to determine the second-order nonlinear optical susceptibility tensor of thin films. The technique does not require the absolute levels or phases of measured signals to be mutually calibrated. In addition it yields indicators that address the quality of theoretical models describing the sample. We use the technique to determine the susceptibility tensor of samples of a nonracemic chiral material which have very low symmetry (both chiral and anisotropic) and have many independent tensor components. The results show the importance of using detailed theoretical models that account for the linear optical properties of the sample.
authors.affiliation: Optics Laboratory, Tampere University of Technology, P.O. Box 692, 33101 Tampere, Finland.
authors.forename: Mikael
authors.initials: M
authors.lastname: Siltanen
authors.forename: Stefano
authors.initials: S
authors.lastname: Cattaneo
authors.forename: Elina
authors.initials: E
authors.lastname: Vuorimaa
authors.forename: Helge
authors.initials: H
authors.lastname: Lemmetyinen
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Katz
authors.forename: Karen E S
authors.initials: KE
authors.lastname: Phillips
authors.forename: Martti
authors.initials: M
authors.lastname: Kauranen