title: Highly efficient continuous wave blue second-harmonic generation in fs-laser written periodically poled Rb:KTiOPO₄ waveguides.
abstract: Waveguides were inscribed into a 9.5 mm long periodically poled KTiOPO4 crystal with a Ti:sapphire femtosecond-laser. Waveguiding was achieved between two parallel written tracks with spacings of 17-19 μm. The fundamental power of 1.6 W for frequency doubling in the waveguide was delivered by a continuous wave Ti:sapphire laser at a wavelength of 943.18 nm. A maximum output power of 76 mW in the blue spectral region was achieved. This corresponds to a single pass normalized conversion efficiency of 4.6%  W(-1) cm(-2).
authors.forename: Sebastian
authors.initials: S
authors.lastname: Müller
authors.forename: Thomas
authors.initials: T
authors.lastname: Calmano
authors.forename: Philip W
authors.initials: PW
authors.lastname: Metz
authors.forename: Christian
authors.initials: C
authors.lastname: Kränkel
authors.forename: Carlota
authors.initials: C
authors.lastname: Canalias
authors.forename: Charlotte
authors.initials: C
authors.lastname: Liljestrand
authors.forename: Fredrik
authors.initials: F
authors.lastname: Laurell
authors.forename: Günter
authors.initials: G
authors.lastname: Huber