EyeSafe 25 Micron Core Holmium-Doped LMA Double Clad Fiber True LMA fiber featuring a unique low NA (< 0.1) high concentration Ho-doped core design. The Ho-doped fiber can be pumped by a Tm-doped fiber laser at ~1950-nm and can achieve 60% efficiency. The high NA (0.46) large pump cladding waveguide allows for efficient coupling of high pump powers. The large core diameter (25 μm) maintains a large mode field diameter and short device length, thereby minimizing non-linear effects such as SBS and SRS. Typical Applications Features & Benefits • High power CW and pulsed • Unique low NA Ho-doped core design — Robust single-mode beam quality • EyeSafe (~2 μm) lasers and • NuCOAT™ fluoroacrylate coating — Greater fiber durability in extreme environmental operating & storage conditions amplifiers • High pump absorption — Short fiber length, efficient lasing in the ~2 μm window • Military and commercial LIDAR • ~2 μm output TEM₀₀ fiber lasers for pumping solid state crystal lasers Optical Specifications Operating Wavelength (nominal) Core NA First Cladding NA (5%) Cladding Attenuation Cladding Absorption LMA-HDF-25/250 2000 nm 0.080 ± 0.010 ≥ 0.46 ≤ 15.0 dB/km @ 810 nm 0.30 ± 0.20 dB/m at 1150 nm Geometrical & Mechanical Specifications Cladding Diameter (flat-to-flat) Core Diameter Coating Diameter Core/Clad Offset Prooftest Level 250.0 ± 8.0 μm 25.0 ± 2.0 μm 395.0 ± 15.0 μm ≤ 2.00 μm ≥ 100 kpsi (0.7 GN/m²) 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. NU0146- 01/19/2012