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WGMs measured by fiber taper with the waist diameter of , when the pump power was below threshold (1.5 mW at 976 nm).
Single WGM of a -diam sol-gel coated microsphere at the laser threshold (pump power of 2 mW).
WGMs measured by the fiber taper coupling, when pump power is 70 mW (the highest peak is at 1573.1 nm)
Laser output powers vs pump powers. Inset: up-conversion luminescence observed in microsphere laser.
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