Fabricating optical fibers for coherent atom-light interfaces
Fiber cavities are used in a wide spectrum of technical and scientific applications ranging from cavity quantum electrodynamics and fiber-coupled single-photon sources to new scanning microscopy techniques. In our automated fabrication facility we manufacture curved mirrors on the end-facets of optical fibers.
In our setup the surface on the fiber tip is curved by ablation with laser pulses. The positioning of the pulse is controlled with ultra precise translation stages. The surface is then characterized with sub-nanometer precision using white light interferometry. This allows us to measure the shape of the mirror during production and to iteratively optimize the geometry.