title: Selective mode excitation in hollow-core photonic crystal fiber.
abstract: Modes are selectively excited by launching light through the cladding from the side into a hollow-core photonic crystal fiber. Measuring the total output power at the end of the fiber as a function of the angle of incidence of the exciting laser beam provides a powerful diagnostic for characterizing the cladding bandgap. Furthermore, various types of modes on either side of the bandgap are excited individually, and their near-field images are obtained.
authors.affiliation: Blazephotonics, Ltd., University of Bath Campus, Claverton Down, Bath BA2 7AY, UK.
authors.forename: A D
authors.initials: AD
authors.lastname: Galea
authors.forename: F
authors.initials: F
authors.lastname: Couny
authors.forename: S
authors.initials: S
authors.lastname: Coupland
authors.forename: P J
authors.initials: PJ
authors.lastname: Roberts
authors.forename: H
authors.initials: H
authors.lastname: Sabert
authors.forename: J C
authors.initials: JC
authors.lastname: Knight
authors.forename: T A
authors.initials: TA
authors.lastname: Birks
authors.forename: P St J
authors.initials: PS
authors.lastname: Russell