title: Nonlinear refractive index of a rare-earth-doped fiber laser.
abstract: An expression is derived for the intensity-dependent index of refraction of a rare-earth-doped fiber laser by use of a Kramers-Kronig relation and simple rate equations. The solution is applied to examine the properties of the nonlinear index of an ytterbium-doped silicate fiber laser at 975-nm pump and 1080-nm laser wavelengths.
authors.affiliation: Nonlinear Optics and Solid State Lasers Branch (DELO), Directed Energy Directorate, Air Force Research Laboratory, Kirtland Air Force Base, New Mexico 87117, USA.
authors.forename: Erik
authors.initials: E
authors.lastname: Bochove