Thorlabs' single mode optical fibers are available for operating wavelengths from 300 nm to 2.3 μm. Our selection includes high-NA fiber, non-zero dispersion-shifted fiber, photosensitive fiber, double-clad fiber, and polyimide-coated optical fiber for applications with ultrashort pulses. In addition, we offer a variety of specialty rare-earth doped single mode optical fibers, including ytterbium and erbium.