title: Ring-doped cladding-pumped single-mode three-level fiber laser.
abstract: We propose and theoretically analyze three-level cladding-pumped fiber lasers in which the laser-active dopant is placed in a ring around a single-mode core. A ring-doped laser can work efficiently at wavelengths with strong small-signal absorption. This is otherwise difficult in a cladding-pumped fiber. Moreover, ring doping makes the laser less sensitive to quenching of the laser-active dopant and to excited-state absorption of the lasing field. In simulations of a Yb(3+) -doped fiber laser, ring doping increased the slope efficiency to 62%, up from 13% for a conventional core-doped fiber.
authors: J
authors: J
authors: Nilsson
authors: J D
authors: JD
authors: Minelly
authors: R
authors: R
authors: Paschotta
authors: A C
authors: AC
authors: Tropper
authors: D C
authors: DC
authors: Hanna