- 作者: Kyungwon An
- 中文摘要:
Department of Physics and Center for Macroscopic Quantum-Field Lasers,
Korea Advanced Institute of Science and Technology, Taejon 305-701, Korea
We report operation of microcavity lasers based on the gain only in the evanescent field region of whispering gallery modes. Two types of microcavities, microsphere and microcylinder, were used. First, a cylindrical microcavity of 125 micron in diameter was surrounded by Rhodamine 6G dye molecules in ethanol solution of lower refractive index such that WGM’s of the microcavity undergo laser oscillation when the dye molecules in the evanescent field region outside the cavity are excited by a second harmonic of a Nd:YAG laser. In the second experiment an ultrahigh Q microsphere was used for a cavity. The dye molecules outside the sphere, near the equator, of 102 mm diameter were excited, resulting in WGM lasing in the lowest radial mode order. The loaded quality factors of the cavity in this case were found to exceed 2 ’ 109, which would be high enough to support lasing with only a single quantum radiator coupled to the WGM. - 英文摘要: --
- 中文關鍵字: --
- 英文關鍵字: --