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Cylindrical and Spherical Microcavity Lasers Based on Evanes Cent‐Wave‐Coupled Gain
Author(s) -
An Kyungwon
Publication year - 2001
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200100069
Subject(s) - lasing threshold , rhodamine 6g , whispering gallery wave , laser , dye laser , chemistry , optical microcavity , excited state , optoelectronics , optics , refractive index , fluorescence , atomic physics , materials science , physics
We report operation of microcavity lasers based on the gain only in the evanes cent 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 out side 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 out side the sphere, near the equator, of 102 μm 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 × 10 9 , which would be high enough to support lasing with only a single quantum radiator coupled to the WGM.