title: Optimization of resonantly cladding-pumped erbium-doped fiber amplifiers for space-borne applications.
abstract: Lasers for use in space-borne applications require ultrahigh efficiency due to limited heat dissipation and power generation capacity. In particular, interplanetary optical communication systems require high-efficiency, moderate-power (>4 W) optical transmitters in the 1600 nm wavelength range. Resonantly pumped dual-clad erbium-doped fiber lasers are best suited for this purpose. Parametric numerical optimizations are performed using a two-level propagation model modified to include spatial effects specific to large-mode-area fibers. Propagation loss mechanisms are found to be limiting factors due to the relatively low cross-sections and low quenching-free doping densities of erbium. Although experimental reports have demonstrated efficiencies up to 33%, simulation results indicate that over 53% power-conversion efficiency can be achieved using commercial fibers, and over 75% can be achieved using custom fibers employing propagation-loss mitigation strategies.
authors.affiliation: The Institute of Optics, University of Rochester, Rochester, New York 14627, USA. hayao@optics.rochester.edu
authors.forename: Haomin
authors.initials: H
authors.lastname: Yao
authors.forename: Malcolm W
authors.initials: MW
authors.lastname: Wright
authors.forename: John R
authors.initials: JR
authors.lastname: Marciante