Fibre optique spéciale

The Yb-MCOF-35/250-07-2.5-PM is a multi-clad, PM fiber with a core diameter of 35 µm, designed for M² lower than 1.15. Our fiber features a confined core for selective gain amplification and multi-layer cladding for superior suppression of higher order modes, making it perfectly suited for amplifying narrow linewidth seed lasers operated in pulsed mode and for applications requiring superior beam quality.



  • Low photodarkening
  • High birefringence
  • Confined core for selective gain amplification


  • Material processing
  • Frequency conversion
  • Biophotonics
  • Range finding


Optical Properties 
Core NA 0.07 ± 0.01
Cladding NA > 0.47
Pump guide absorption @ 915 nm 2.5 ± 0.5 dB/m
Nominal pump guide absorption @ 975 nm 10.0 dB/m
Birefringence ≥ 1.4 x 10-4
Beam quality factor M² < 1.15
Physical Properties 
Optical cladding Multi
Core diameter 35.0 ± 3.0 µm
Silica cladding diameter 250.0 ± 5.0 µm
Coating diameter 390.0 ± 20.0 µm
Cladding geometry Round
Screen proof tested  ≥ 100 kpsi
Recommended coiling diameter ≥ 14 cm
Confined core Yes
Depressed cladding Yes
Price per meter, 1 to 9 meters (in USD)* $550

**Price may vary depending on quantity ordered. Request a quote now!

A lower numerical aperture version of this fiber is available: the Yb-MCOF-35/250-05-2.0-PM fiber.

A lower absorption version of this fiber is also available: the Yb-MCOF-35/250-07-0.9-PM fiber.


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