Abstract
We demonstrate efficient Raman lasing with whispering-gallery-mode resonators. Continuous-wave emission threshold is shown to be possible below with a cavity, which is to our knowledge orders of magnitude lower than in any other Raman source. Low-threshold lasing is made possible by the ultrahigh optical quality factor of the cavity, of the order of . Stokes components of up to the fifth order were observed at a pump power of , and up to the eighth order at . A lasing threshold of was also observed in a microcavity. Potential applications are discussed.
© 2006 Optical Society of America
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