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Published June 15, 2001 | public
Journal Article Open

Highly efficient hybrid fiber taper coupled microsphere laser


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 112 µW of single-frequency laser output power was measured, with a differential quantum efficiency of 12%.

Additional Information

© 2001 Optical Society of America Received January 17, 2001 This research was supported by the Defense Advanced Research Projects Agency, the U.S. Office of Naval Research, and the Caltech Lee Center.


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