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  • Received: Nov. 4, 2003

    Accepted: --

    Posted: Jun. 6, 2006

    Published Online: Jun. 6, 2006

    The Author Email: Ruopeng Wang (


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    Wen Li, Ruopeng Wang. Resonating properties of passive spherical optical microcavities[J]. Chinese Optics Letters, 2004, 2(5): 05271

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Chinese Optics Letters, Vol. 2, Issue 5, 05271 (2004)

Resonating properties of passive spherical optical microcavities

Wen Li and Ruopeng Wang*

Author Affiliations

  • Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871


As an optically pumped device, the lasing characteristics of a spherical microcavity laser depend on the optical pumping processes. These characteristics can be described in term of the Q factor and the optical field distribution in a microsphere. We derived analytical expressions and carried out numerical calculation for Q factor and optical field. The Q factor is found to be oscillatory functions of the radius of a microsphere and the pumping wavelength, and the pumpingefficiency for a resonating microsphere is much higher than that for an anti-resonating microsphere. Using tunable lasers as pumping sources is suggested in order to achieve a higher pumping efficiency. Numerical calculation on optical fielddistribution in spherical microcavities shows that a well focused Gaussian beam is a suitable incident wave for cavity quantum electrodynamics experiments in which strong confinement of optical field in the center of a microsphere is requested, but higher order spherical wave should be used instead for exciting whispering-gallery-mode (WGM) microsphere lasers, for the purpose of favoring optical energy transferring to WGM in optical microspheres.


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