A novel hybrid fiber taper is proposed and demonstrated as the coupler in a microsphere laser system. The pump wave and the laser emission, respectively, are more efficiently coupled to and from the sphere modes with this taper structure. A 980-nm pumped erbium–ytterbium codoped phosphate microsphere laser is demonstrated in the 1550-nm band. As much as 112µW of single-frequency laser output power was measured, with a differential quantum efficiency of 12%.
© 2001 Optical Society of America
(140.3510) Lasers and laser optics : Lasers, fiber
(140.4780) Lasers and laser optics : Optical resonators
(230.1150) Optical devices : All-optical devices
(230.3990) Optical devices : Micro-optical devices
Ming Cai and Kerry Vahala, "Highly efficient hybrid fiber taper coupled microsphere laser," Opt. Lett. 26, 884-886 (2001)