Abstract

Nonaxisymmetric fused-silica microspheres were fabricated by using only one microsphere by virtue of short pulses of a ${\mathrm{CO}}_2$ laser. Highly directional emission from whispering-gallery modes (WGMs) was studied through direct free-space evanescent excitation. The observed quality factors of WGMs are high, up to $2\times {10}^7$, despite this deformation. We show that WGMs in slightly deformed microspheres possibly play an important role in cavity quantum electrodynamics research.

© 2007 Optical Society of America

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