We report the observation of whispering-gallery-mode lasers based on Er<sup>3+</sup> -doped ZBLAN microspheres coupled with half-tapered and tapered optical fibers. A multimode lasing effect is observed at 1.56μ when the taper diameters are properly adjusted so that their fundamental propagation constants match those of the resonant modes of interest. Overlap between the pump and the laser geometrical modes is optimized by pumping at 1.48μ .
© 2001 Optical Society of America
(140.3410) Lasers and laser optics : Laser resonators
(140.3500) Lasers and laser optics : Lasers, erbium
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.5680) Lasers and laser optics : Rare earth and transition metal solid-state lasers
F. Lissillour, D. Messager, G. Stéphan, and P. Féron, "Whispering-gallery-mode laser at 1.56 μm excited by a fiber taper," Opt. Lett. 26, 1051-1053 (2001)