Thorlabs' single mode optical fibers are available for operating wavelengths from 300 nm to 5.5 μm. Our selection includes high-NA fiber, non-zero dispersion-shifted fiber, highly nonlinear fiber, fluoride fiber manufactured in-house, double-clad fiber, and photosensitive fiber. In addition, we offer a variety of specialty rare-earth doped single mode optical fibers, including ytterbium and erbium, as well as polyimide-coated fiber for high-power applications.