title: Efficient approximately 2 microm Tm3+ -doped tellurite fiber laser.
abstract: Laser emission in the range of 1.88-1.99 micrim from a Tm3+ -doped tellurite fiber is demonstrated when pumped with a diode-pumped Er3+/Yb3+-doped silica fiber laser operating at 1.57-1.61 microm. This pump source excites the Tm3+ ions directly into the F43 upper laser level and yields an output power of 280 mW with a slope efficiency of 76% in a 99%-12% laser cavity arrangement and a 32 cm long fiber. This result is very close to the Stokes efficiency limit of approximately 80%. This is, to the authors' knowledge, the first demonstration of high efficiency lasing in a tellurite fiber at wavelengths longer than 1.56 microm.
authors.forename: Billy
authors.initials: B
authors.lastname: Richards
authors.forename: Yuen
authors.initials: Y
authors.lastname: Tsang
authors.forename: David
authors.initials: D
authors.lastname: Binks
authors.forename: Joris
authors.initials: J
authors.lastname: Lousteau
authors.forename: Animesh
authors.initials: A
authors.lastname: Jha