Fabrication and characteristic of a simplified hollow-core microstructured fiber

A simplified hollow-core microstructured fiber was fabricated and investigated. The diameter of the core is about 31 μm, and the thickness of the bridges t is about 280 nm. Three broad band transmission windows with relative low loss were measured in IR domain with the large bandwidth of ~600 nm. A Gaussian-shaped beam profile with visible pattern guided by the large core was observed in far field. The curvature behavior was also studied. This large core broad band transmission fiber offers a good medium for applications in high energy delivery, novel gas-cell based laser and sensing devices.