EyeSafe 25 Micron Core Holmium-Doped LMA Double Clad Fiber0 pages

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