Resonating properties of passive spherical optical microcavities |
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作者姓名: | 李文 王若鹏 |
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作者单位: | Department of Physics and State Key Laboratory for Mesoscopic Physics,Peking University,Beijing 100871,Department of Physics and State Key Laboratory for Mesoscopic Physics,Peking University,Beijing 100871 |
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基金项目: | ThisworkwassupportedbytheNationalNaturalScienceFoundationofChinaunderGrantNo.69977004. |
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摘 要: | 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 pumping efficiency 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 field distribution 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
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