We develop a method for fabricating very small silica microbubbles having a micrometer-order wall thickness and demonstrate the first optical microbubble resonator. Our method is based on blowing a microbubble using stable radiative $\mathrm{C}{\mathrm{O}}_2$ laser heating rather than unstable convective heating in a flame or furnace. Microbubbles are created along a microcapillary and are naturally opened to the input and output microfluidic or gas channels. The demonstrated microbubble resonator has $370\mu \mathrm{m}$ diameter, $2\mu \mathrm{m}$ wall thickness, and a Q factor exceeding ${10}^6$ .

© 2010 Optical Society of America

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