We report laser oscillations in whispering-gallery modes (WGMs) of a microsphere with its cavity quality factor Q unchanged for varied optical pumping intensities well above the laser threshold. Laser gain was present only in the evanescent-wave region of the lasing WGM around the microsphere equator, and thus pumping-induced Q degradation could be minimized, resulting in Q values maintained at 8(2)×10 9 regardless of the pumping strength.
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An et al. (2003) studied this question.
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