25/300 Erbium/Ytterbium Co-doped LMA Double Clad Fibers Nufern's Large Mode Area (LMA) and Polarization Maintaining LMA (PLMA) Er/Yb co-doped fiber features a unique low NA (0.09) core design, achieved without sacrificing high pump conversion efficiency and developed for applications where robustly single-mode output beam quality is critical. The high NA (0.46) 300 μm cladding waveguide allows for efficient coupling of high pump powers, while the large core diameter (25 μm) maintains a large-mode field diameter and short device length thereby minimizing deleterious nonlinear effects such as SBS and SRS. They utilize the latest fiber design and NuCOAT™ coating technology to ensure excellent preservation of beam quality and extended operating life at the high power levels demanded by today’s industrial fiber laser applications. Typical Applications Features & Benefits • NuCOAT™ fluoroacrylate coating — Greater fiber durability in extreme environmental conditions amplifiers • Military and commercial lidar • High peak power, pulsed fiber amplifiers • Ultra-short pulse fiber amplifiers • Unique low NA Er/Yb co-doped core design — Few moded core, for robust SM beam quality • Large-mode field diameter — Increased threshold for non-linearities • Optimized, high efficiency core glass composition — Suitable for high power operation • All fiber proof tested to > 100 kpsi — Critical for ensuring long term reliability when coiling Optical Specifications Operating Wavelength Core NA First Cladding NA (5%) Cladding Attenuation Cladding Absorption Core Absorption 1530 – 1625 nm 0.090 ≥ 0.46 ≤ 30.0 dB/km @ 1095 nm 2.90 ± 0.50 dB/m at 915 nm 85.0 ± 15.0 dB/m near 1535 nm nominal 1.5 × 10⁻⁴ Birefringence Geometrical & Mechanical Specifications Cladding Diameter Cladding Diameter (flat-to-flat) Core Diameter Coating Diameter Core/Clad Offset Prooftest Level The passive version of each fiber is also available - see PLMA-GDF-25/300 and LMA-GDF-25/300 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. Standard specifications and design parameters are listed above. Specifications are subject to change without notice. Other configurations such as alternative form factors, optimized cut-off and UV cured color coating may be available. Let us know how Nufern can assist with your requirements. NU0161- 11/07/2013