There is interest in single-mode fibers that are highly transparent in the mid-infrared. Such fibers would be valuable for spectroscopy, interferometry, and heterodyne detection. We have developed core–clad fibers made of crystalline silver halides with an external diameter of and core diameters as small as . These fibers exhibit homogeneous core and cladding regions, round cores, and smooth core–cladding interfaces. The fibers support roughly 70 modes and have low losses over a broad spectral range in the mid-infrared. This will pave the road for the development of single-mode mid-infrared fibers.
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