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Laser Oscillations with Pumping-Independent Ultrahigh Cavity Quality Factors in Evanescent-Wave-Coupled-Gain Microsphere Dye Lasers

2003; Physical Society of Japan; Volume: 72; Issue: 4 Linguagem: Inglês

10.1143/jpsj.72.773

1347-4073

Kyungwon An, Hee-Jong Moon,

Advanced Fiber Laser Technologies

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.