This phosphosilicate fiber is ideal as a gain medium for lower power amplifiers or the pre-amplifier stage and is mainly used in a MOPA configuration of a pulsed fiber laser. On top of all the benefits found in a phosphosilicate fiber (photodarkening-free and high absorption), this fiber shows high energy saturation, which is essential for applications such as laser marking and engraving.

Features & Benefits
  • Strictly single-mode operation and low splice loss with passive matching fibers for excellent beam quality
  • Photodarkening-free – ensures stable long-term operations
  • Wide, flat absorption from 910 nm to 970 nm – reduces pump cooling and allows 940-960 nm pumping
  • Pulsed fiber lasers: gain media in pre-amplifiers or low power amplifiers for MOPA configuration
  • Material processing: laser marking, laser engraving, micromachining and welding
  • Medical Applications
Cladding Absorption @ 915 nm (dB/m)
1.8 ± 0.3
Cladding Absorption @ 975 nm (nominal) (dB/m)
Core Numerical Aperture
0.10 ± 0.02
Cladding Numerical Aperture
> 0.45
Geometrical & Mechanical
Core Diameter (µm)
8 ± 1
Cladding Diameter (µm)
128 ± 3
Core/Cladding Concentricity Error (µm)
< 1.5
Coating Diameter (µm)
260 ± 20

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