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Opt Lett. 2009 Feb 15;34(4):509-11.

Low-threshold microlaser in a high-Q asymmetrical microcavity.

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  • 1Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China.


We experimentally report an asymmetrical spherical microcavity with thermal-induced deformation, in which five-bounce whispering-gallery modes possess not only ultrahigh quality factors (Q) but also remarkably directional escape emission from the microsphere boundary. With efficient free-space excitation and collection, a low-threshold microlaser is demonstrated and exhibits a highly directional emission. Our measurement agrees well with the theoretical predictions by corrected Fresnel law.

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