Lasing characteristics of dye-doped spherical solid microparticles produced by photopolymerization in aerosols are investigated. It is well known that dielectric spherical microparticles are optical resonators with very high quality. The resonant internal field is not completely confined to the interior of the particle. An evanescent wave extends a couple of micrometers into the surrounding area. This evanescent field decays exponentially. We demonstrate that cascade lasing can be excited by coupling of two spherical microresonators through this evanescent field. (C) 2001 Optical Society of America. [References: 12]
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