Specialty capillaries and multi-core optical fibres for applications in imaging and multi-modal spectroscopy

We present examples of recent developments on specialty optical fibers at Leibniz-IPHT. A dual-core dual-clad fiber for multi-modal analyses was fabricated by a stack and draw technique, where MCVD Ge-doped core rods, pure and F-doped fused silica components were combined. For imaging applications fibers with a higher number of cores without cross talk were drawn. For application as feed through thin walled capillaries were drawn. By careful control of the drawing conditions and pressure both wall thickness and hole diameter were prepared with a variation better than 1μm.