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Ultralow-threshold Raman lasing with CaF 2 resonators

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Abstract

We demonstrate efficient Raman lasing with CaF2 whispering-gallery-mode resonators. Continuous-wave emission threshold is shown to be possible below 1μW with a 5mm 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 Q=5×1010. Stokes components of up to the fifth order were observed at a pump power of 160μW, and up to the eighth order at 1mW. A lasing threshold of 15μW was also observed in a 100μm CaF2 microcavity. Potential applications are discussed.

© 2006 Optical Society of America

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