Abstract
We have reduced the lasing threshold of a circular resonator, formedby a dye-doped pendant drop, by changing its shape from a circle toan oval. This phenomenon can be explained by the decrease of thenumber (p) of modes that support lasing in the resonator. Atheory that connects wave and ray pictures in dealing with the cavityresonance is used to estimate p and its dependence on theeccentricity of an oval-shaped resonator. The measured lasingthreshold and the calculated p have a linear relationship inagreement with our prediction.
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