title: Diffraction in air-clad fibres.
abstract: The angular transmissivity of high numerical aperture air-clad fibres is measured as a function of skewness of the launched light. Within the experimental limits the measured transmissivity of skew rays is significantly lower compared to theoretical predictions for air-clad fibres with uniform cladding surfaces. The discrepancy is attributed to diffractive losses of skew rays from the periodic corrugations at the pump core-cladding air interface.
authors.forename: M
authors.initials: M
authors.lastname: Aslund
authors.forename: J
authors.initials: J
authors.lastname: Canning
authors.forename: S
authors.initials: S
authors.lastname: Jackson
authors.forename: A
authors.initials: A
authors.lastname: Teixeira
authors.forename: K
authors.initials: K
authors.lastname: Lyytikäinen