title: Measurement of nonlinear absorption coefficients of organic materials by mode-mismatched Z-scan thermal lensing technique.
abstract: We evaluate a new pump-probe mode-mismatched thermal lens (TL) scheme for the measurement of nonlinear absorption in nitrobenzene, benzene, and chloroform. In this new scheme the pump beam is focused in the presence of a collimated probe beam. Values of the nonlinear absorption coefficients of the materials studied for the wavelength of 532 nm are reported, and we compare the proposed technique with the well-known open Z-scan method.
authors.affiliation: Laboratoire des Proprietés Optiques de Matériaux et Applications, UMR-CNRS 6236, 2, Bd Lavoisier 49045 Angers Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Guerra
authors.forename: A
authors.initials: A
authors.lastname: Taouri
authors.forename: A
authors.initials: A
authors.lastname: Marcano O
authors.forename: H
authors.initials: H
authors.lastname: Cabrera
authors.forename: M
authors.initials: M
authors.lastname: Sylla