Single radial-mode lasing in a submicron-thickness spherical shell microlaser

Abstract

The authors have investigated whispering-gallery mode (WGM) lasing characteristics in a submicron-thickness spherical shell microlaser. The dielectric shell region was doped with dye molecules at a low concentration so as to provide a gain for lasing as well as to confine WGM's tightly. Lasing in the lowest-mode-order WGM with a quality factor as high as 107 was observed. © 2007 American Institute of Physics.