Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects
Q 30.20: Poster
Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais
Transverse Mode Coupling and Diffraction Loss in Fiber Based Micro Cavities — •Julia Benedikter1, Thomas Hümmer1,2, Raphael Franz1, Matthias Mader1,2, Theodor Hänsch1,2, and David Hunger1,2 — 1Ludwig-Maximilians-Universität, Schellingstraße 4, 80799 München — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching
Fiber-based Fabry-Perot resonators provide very small mode volumes and high Finesse in a tunable and accessible geometry [1,2]. This makes them attractive for various applications ranging from cold atom and ion experiments to cavity optomechanics and cavity-enhanced single photon sources. In contrast to macroscopic cavities, the mirrors are not spherical, but rather have a Gaussian profile originating from the laser machining process used to shape the fiber surface. In consequence, Hermite-Gauss modes are no longer the eigenmodes of this system as their wave fronts do not match the mirror surface. This leads to modified mode shapes and transverse mode coupling occurs. Furthermore, the cavity mode can be of the same order of the mirror size, such that diffraction loss becomes an important issue.
We report on first measurements with cavities consisting of a fiber mirror and a macroscopic plane mirror showing clear signs of mode coupling and diffrcation loss, and present a method for calculating the cavity eigenmodes and diffraction loss [3].
[1] Hunger et al., NJP 12, 065038 (2010)
[2] Hunger et al., AIP Advances 2, 012119 (2012)
[6] Kleckner et al., PRA 81, 043814 (2010)