Hamburg 2009 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 55: Poster III
Q 55.26: Poster
Thursday, March 5, 2009, 16:30–19:00, VMP 8 Foyer
Transverse modes in few-mode fiber amplifiers — •Niklas Andermahr1,2, Martin Schäferling2, Christian Vorholt2, and Carsten Fallnich2 — 1Laserzentrum Hannover, Hollerithallee 8, 30419 Hannover, Germany — 2Institut für Angewandte Physik - WWU Münster, Corrensstraße 2, 48149 Münster, Germany
Large mode area fibers are used for high-power fiber amplifiers, as they accomplish to reduce the power density within the core. However, a larger core diameter in general allows the propagation of higher-order transverse modes.
We model the propagation of transverse modes by solving the Fresnel wave equation [1]. Thereby the electrical field is calculated, which allows to visualize the intensity distribution within the fiber. Moreover, the modal powers and the modal polarization states are derived from the electrical field. As the gain saturates locally, the transverse modes can interact with each other. A polarization dependent mode amplification is found that is in good agreement with recent experimental results [2].
[1] N. Andermahr and C. Fallnich, Opt. Express 16 (24), 20039 (2008)
[2] N. Andermahr and C. Fallnich, Opt. Express 16 (12), 8679 (2008)