title: Enhanced fourth harmonic generation via nonlinear Čerenkov interaction in periodically poled lithium niobate crystal.
abstract: We introduce a custom-cut periodically poled ferroelectric crystal for the phase matching of multistep cascading frequency conversion processes. Our approach involves combination of collinear second harmonic generation and transverse sum frequency mixing via the total internal reflection of the fundamental and collinear second harmonic beams. As a proof of concept we demonstrate multiple frequency generation with an enhanced fourth harmonic signal in a one-dimensional periodically poled LiNbO3crystal.
authors.forename: Xin
authors.initials: X
authors.lastname: Chen
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Switkowski
authors.forename: Xiaopeng
authors.initials: X
authors.lastname: Hu
authors.forename: Wieslaw
authors.initials: W
authors.lastname: Krolikowski
authors.forename: Yan
authors.initials: Y
authors.lastname: Sheng