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Chinese Optics Letters

Chinese Optics Letters


  • Vol. 2, Iss. 5 — May. 10, 2004
  • pp: 271–274

Resonating properties of passive spherical optical microcavities

Wen Li and Ruopeng Wang  »View Author Affiliations

Chinese Optics Letters, Vol. 2, Issue 5, pp. 271-274 (2004)

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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.

© 2005 Chinese Optics Letters

OCIS Codes
(140.4780) Lasers and laser optics : Optical resonators
(140.5560) Lasers and laser optics : Pumping
(260.2160) Physical optics : Energy transfer

Wen Li and Ruopeng Wang, "Resonating properties of passive spherical optical microcavities," Chin. Opt. Lett. 2, 271-274 (2004)

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