title: Towards femtosecond laser written arrayed waveguide gratings.
abstract: The fabrication of arrayed waveguide gratings (AWGs) using the femtosecond laser direct-write technique is investigated. We successfully demonstrate the fabrication of large planar waveguides that act as 2D free propagation zones. These slabs were found to have a highly uniform refractive index with a standard deviation of 1.97% relative to the total index contrast. The incorporation of low loss linear adiabatic tapers resulted in an increase of transmission by 90%. Strategies for manufacturing integrated laser written AWGs using continuous contouring to avoid lossy defects are discussed and demonstrated.
authors.forename: G
authors.initials: G
authors.lastname: Douglass
authors.forename: F
authors.initials: F
authors.lastname: Dreisow
authors.forename: S
authors.initials: S
authors.lastname: Gross
authors.forename: S
authors.initials: S
authors.lastname: Nolte
authors.forename: M J
authors.initials: MJ
authors.lastname: Withford