摘要
Lasing of an optical microbottle resonator at predetermined resonant wavelengths is feasible via spatial engineering of the pump laser beam.The whispering gallery mode(WGM)phenomenon,which was first discovered by Lord Rayleigh in 1912 for acoustic waves running around the interior of the dome of St Paul’s Cathedral in London1,has found exciting microscale applications for optical microresonators.Similar to acoustic WGMs,optical WGMs circulate inside an optical microresonator,reflecting from its surface due to the effect of total internal reflection.Different types of optical WGM microresonators enable the delay,control,generation and transformation of light on a microscale;these types have been demonstrated and investigated2–4.Their fabrication methods include the melting of optical materials,mechanical and laser machining and polishing,and the use of liquid or solidified liquid droplets.
