Abstract
This paper reports, for the first time to our best knowledge, a nearly diffraction-limited output in a codoped double cladding silica fiber with a 50 μm core diameter and 0.02 core NA. The core glass with a diameter was fabricated through solgel process combined with high temperature sintering. Laser performances of this fiber at different bend diameters were studied. The mean in this 50 μm core diameter fiber was achieved at a bend diameter of 0.35 m. The core glass with the refractive index nearly equal to pure silica glass is suitable for the fiber design, such as large-mode-area photonic crystal fiber.
© 2016 Optical Society of America
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