title: Single-mode fiber laser based on core-cladding mode conversion.
abstract: A single-mode fiber laser based on an intracavity core-cladding mode conversion is demonstrated. The fiber laser consists of an Er-doped active fiber and two fiber Bragg gratings. One Bragg grating is a core-cladding mode converter, and the other Bragg grating is a narrowband high reflector that selects the lasing wavelength. Coupling a single core mode and a single cladding mode by the grating mode converter, the laser operates as a hybrid single-mode laser. This approach for designing a laser cavity provides a much larger mode area than conventional large-mode-area step-index fibers.
authors.affiliation: College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA. suzuki@optics.arizona.edu
authors.forename: Shigeru
authors.initials: S
authors.lastname: Suzuki
authors.forename: Axel
authors.initials: A
authors.lastname: Schülzgen
authors.forename: N
authors.initials: N
authors.lastname: Peyghambarian