The high demand for a photodarkening-free optical fiber for multi kW single-mode CW fiber laser applications near 1 µm has driven the development of this phosphosilicate fiber. Manufactured under a carefully control process, its refractive index profile and core chemical composition allow high reproducibility. This ensures a reliable batch-to-batch consistency. With output power up to 1.5 kW with very low nonlinear effects, this fiber is best for industrial applications requiring high-power output.

Features & Benefits
  • Photodarkening-free – excellent batch-to-batch consistency
  • Accurate matching MFD design with related passive fiber – allows single-mode operation and low splicing losses
  • High cladding absorption – reduces fiber length in order to mitigate nonlinear effects such as SRS
  • High fiber laser efficiency (> 70%)
  • High stability against pump wavelengths between 915 nm to 970 nm
  • Output power up to 1.5 kW
  • High-power CW fiber lasers
  • Material processing: cutting and welding
  • Defense
  • Medical
Cladding Absorption @ 915 nm (dB/m)
0.73 ± 0.05
Core Numerical Aperture
0.11 ± 0.01
Cladding Numerical Aperture
> 0.45
Geometrical & Mechanical
Core Diameter (µm)
15 ± 2
Cladding Diameter (µm)
250 ± 5
Core/Cladding Concentricity Error (µm)
< 1.0
Coating Diameter (µm)
375 ± 15

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