The Yb401 is a single-clad and truly singlemode fiber featuring a 6.0 μm MFD @ 1060 µm and a core absorption of 140 dB/m @ 915 µm. 


It is ideally suited for low power lasers and amplifiers using single-mode laser diode pumps.

Main specifications

Optical Properties

Core NA 0.14 ± 0.02
Mode field diameter @1060 nm 6.0 ± 1.0 µm
LP11 cut-off wavelength 800 - 900 µm
Core absorption @ 915 nm 140 ± 25 dB/m
Nominal core absorption @ 975 nm 600 dB/m
Birefringence Non-PM

Physical Properties

Optical cladding Single
Core diameter 5.0 ± 0.5 µm
Cladding diameter 125 ± 1.0 µm
Coating diameter 250.0 ± 10.0 µm
Cladding geometry Round
Low photodarkening chemistry Yes
Screen proof tested ≥ 100 kpsi
Confined core No
Depressed cladding No
Price per meter, 1 to 9 meters (in USD)* $150
**Price may vary depending on quantity ordered. now!
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