Abstract
Motivated by the recent observation of periodic filter characteristics
of an oval-shaped microcavity, we study the possible interference of multiple
beams in the far field of a laser-illuminated quadrupolar glass fiber. From
numerical ray-tracing simulations we obtain the interference-relevant length-difference
spectrum and compare it with data extracted from the experimental filter results.
Our analysis reveals that different polygonal cavity modes that are refractively
output coupled in the high-curvature region of the fiber contribute to the
observed far-field interference.
© 2001 Optical Society of America
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