Dresden 2003 – scientific programme
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DY: Dynamik und Statistische Physik
DY 46: Poster
DY 46.26: Poster
Thursday, March 27, 2003, 15:30–18:00, P1
Optical filtering through multiple beam interference in fibers — •Martina Hentschel1 and Matthias Vojta2 — 1Department of Physics, Duke University, Durham, USA — 2Institut für Theorie der Kondensierten Materie, Universität Karlsruhe
Active and passive optical microresonator devices receive growing attention nowadays. 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 being refractively output-coupled in the high-curvature region of the fiber contribute to the observed far-field interference. This suggests a critical dependence of the experimental observations on the fiber parameters that we illustrate in numerical examples.