Low Index Specialty Multimode Beam Delivery Fibers Nufern's passive, Germanium-doped, low NA specialty beam delivery fibers are designed to complement standard Nufern Ytterbium-doped fibers such as LMA-YDF-20/400-M, LMA-YDF-25/250-M and LMA-YDF-30/250-M. These Germaniumdoped fibers are available with a high 0.11 NA and 25 micron core, in both 250 and 400 micron form factors. These fibers can be spliced with low losses to the 0.06 NA fibers and ensure good beam stability as the low power is delivered to the work piece. Both offerings have NuCOAT-FA™ coating technology, which provides excellent reliability at elevated power levels demanded by today’s industrial fiber laser applications. As with all Nufern fibers, they are drawn in a clean room and prooftested to > 100 kpsi, allowing them to carry high powers for a long, worry-free lifetime. Typical Applications Features & Benefits • Beam Delivery for CW & Pulsed • Complimentary high NA passive fibers — ensures continuation of excellent beam quality Lasers • Fiber Coupled Isolators • Military, Industrial and Medical Optical Specifications Operating Wavelength Core NA First Cladding NA (5%) Cladding Attenuation • Exceptional geometric uniformity and core/clad concentricity — Ease of splicing to active fibers • NuCOATFA™ coating technology — provides an extended operating life at high power levels • Prooftested to > 100 kpsi — an industry requirement for long term reliability. 250.0 ± 3.0 µm 25.0 ± 1.5 µm 395.0 ± 15.0 µm ≤ 2.00 µm ≤ 0.5 % Low Index Acrylate ≥ 100 kpsi (0.7 GN/m²) 400.0 ± 5.0 µm 25.0 ± 1.5 µm 550.0 ± 15.0 µm ≤ 2.00 µm ≤ 0.5 % Low Index Acrylate ≥ 100 kpsi (0.7 GN/m²) Geometrical & Mechanical Specifications Cladding Diameter Core Diameter Coating Diameter Core/Clad Offset Clad Non-Circularity Coating Material Prooftest Level 7 Airport Park Road, East Granby, CT 06026 • 860.408.5000 • Toll-free 866.466.0214 • Fax 860.844.0210 • E-mail info @ nufern.com • www.nufern.com • Nufern products are manufactured under an ISO 9001:2008 certified quality management system. Custom developed fiber (FUD) specifications are subject to change without notice. Other configurations such as alternative form factors, optimized cut-off and UV cured color coating may be availabl