25/250 Ytterbium-Doped LMA Double Clad Fibers Nufern’s 25/250 Ytterbium-doped double clad fiber is ideally suited for high peak power pulsed fiber amplifier applications. Based on a waveguide structure that supports less modes than the 30/250 fiber, this fiber is incorporated into components and monolithic designs where maintaining beam quality can be more difficult. Both non-PM and PANDA-style PM fibers are available, as are a range of support fibers for component and pigtail development efforts. As with all Nufern standard Large Mode Area (LMA) fibers, these fibers are proof-tested to 100 kpsi, an industry requirement for long term reliability when coiling for mode filtering. Typical Applications Features & Benefits • High peak power amplifiers • NuCOAT™ fluoroacrylate coating — Greater fiber durability in extreme environmental operating & storage conditions • LMA core design and short amplifier length — Useful for generating high peak powers • Material processing • “Few” moded core design — Easy to maintain single mode LP01 beam through fiber & components • Non-linear optics/frequency • PANDA-style stress structure for increased birefringence — Superior optical performance and uniformity • 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 Birefringence 1060 – 1115 nm 0.060 ± 0.010 ≥ 0.46 ≤ 15.0 dB/km @ 1095 nm 1.70 ± 0.20 dB/m at 915 nm 5.10 dB/m near 975 nm nominal 2 × 10⁻⁴ 250.0 ± 10.0 µm N/A 25.0 ± 2.5 µm 400.0 ± 20.0 µm Low Index Polymer ≥ 100 kpsi (0.7 GN/m²) N/A 250.0 ± 10.0 µm 25.0 ± 2.5 µm 400.0 ± 20.0 µm Low Index Polymer ≥ 100 kpsi (0.7 GN/m²) Geometrical & Mechanical Specifications Cladding Diameter Cladding Diameter (flat-to-flat) Core Diameter Coating Diameter Coating Material Prooftest Level The passive version of each fiber is also available. Precision matched fiber sets are also available - see PLMA-YDF-25/250-M; LMA-YDF-25/250-M; PLMA-GDF-25/250-M and LMA-GDF-25/250-M 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. NU0101- 11/07/2013