This Yb-doped phosphosilicate fiber is designed for multimode operation in the 1 μm region. Manufactured under a carefully control process, the refractive index profile and core chemical composition allow high reproducibility. This ensures a reliable batch-to-batch consistency. With its output power of up to 4kw in multimode, this fiber allows the design of laser cavity without being limited by non-linear effects and transverse mode instabilities (TMI). It is ideal for industrial applications requiring high power output.

Features & Benefits
  • Photodarkening-free – excellent batch-to-batch consistency
  • Multimode operation – no limitations caused by nonlinear effects and transverse mode instabilities (TMI)
  • High fiber laser efficiency (> 70%)
  • High stability against pump wavelengths between 915 nm to 970 nm
  • Output power up to 4 kW in a single cavity
  • High-power CW fiber lasers
  • Material processing: cutting and welding
Cladding Absorption @ 915 nm (dB/m)
0.50 ± 0.10
Core Numerical Aperture
0.16 ± 0.01
Cladding Numerical Aperture
> 0.46
Background Loss @ 1200 nm (dB/km)
< 10.0
Geometrical & Mechanical
Core Diameter (µm)
25.0 ± 1.0
Cladding Diameter – Flat-to-Flat (µm)
400 ± 15
Core/Cladding Concentricity Error (µm)
< 2.5
Coating Diameter (µm)
560 ± 20

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