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Q: Fachverband Quantenoptik und Photonik

Q 65: Poster Photonik

Q 65.7: Poster

Donnerstag, 22. März 2007, 16:30–18:30, Poster C

Thermo-acoustic optical path length stabilization in a single mode optical fiber. — •Wojciech Lewoczko-Adamczyk¹, Max Schiemangk¹, Holger Müller², and Achim Peters¹ — ¹Humboldt Universität zu Berlin, Institut für Physik, Quantenoptik und Metrologie, Hausvogteiplatz 5-7, 10117 Berlin — ²Physics Department, Stanford University, Stanford, CA 94305

We present a simple technique to actively stabilize the optical path length in an optical fiber. A part of the fiber is coated with a thin electrically conductive layer, which acts as a heater. The optical path length is thus modified by temperature dependent changes in the refractive index and in the mechanical length of the fiber. The dynamic response of the latter is dominated by the speed of sound in glas rather than by slow thermal diffusion. Making use of this fact we succeeded in actively stabilizing the optical path length with a closed-loop bandwidth greater than 1 kHz.