14 February 2007 The maximum group delay in a resonator: an unconventional approach
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We introduce a definition of group velocity for a system with a discreet spectrum and apply it to a linear resonator. We show that a positive, negative, or zero group velocity can be obtained for light propagating in the whispering gallery modes of a microspherical resonator. The associated group delay is practically independent of the ring-down time of the resonator. We demonstrate "stopped light" in an experiment with a fused silica microsphere.
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Andrey B. Matsko, Anatoliy A. Savchenkov, Vladimir S. Ilchenko, Dmitry Strekalov, Lute Maleki, "The maximum group delay in a resonator: an unconventional approach", Proc. SPIE 6452, Laser Resonators and Beam Control IX, 64520P (14 February 2007); doi: 10.1117/12.714218; https://doi.org/10.1117/12.714218

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