title: Absorption measurements of periodically poled potassium titanyl phosphate (PPKTP) at 775 nm and 1550 nm.
abstract: The efficient generation of second-harmonic light and squeezed light requires non-linear crystals that have low absorption at the fundamental and harmonic wavelengths. In this work the photo-thermal self-phase modulation technique is exploited to measure the absorption coefficient of periodically poled potassium titanyl phosphate (PPKTP) at 1,550 nm and 775 nm. The measurement results are (84±40) ppm/cm and (127±24) ppm/cm, respectively. We conclude that the performance of state-of-the-art frequency doubling and squeezed light generation in PPKTP is not limited by absorption.
authors.affiliation: Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Hannover, Germany.
authors.forename: Jessica
authors.initials: J
authors.lastname: Steinlechner
authors.forename: Stefan
authors.initials: S
authors.lastname: Ast
authors.forename: Christoph
authors.initials: C
authors.lastname: Krüger
authors.forename: Amrit Pal
authors.initials: AP
authors.lastname: Singh
authors.forename: Tobias
authors.initials: T
authors.lastname: Eberle
authors.forename: Vitus
authors.initials: V
authors.lastname: Händchen
authors.forename: Roman
authors.initials: R
authors.lastname: Schnabel