nLIGHT (Vancouver, WA) has released highly doped, photodarkening-resistant ytterbium fibers with up to 60% higher absorption at 920nm and pump conversion efficiencies routinely over 75%. The LIEKKITM Yb2000 fibers are available in core/clad geometries ranging from 7/125 μm to 30/250 μm in non-polarization and polarization maintaining versions. The large mode area (LMA), low numerical aperture (NA) fibers exhibit a five-fold decrease in loss under accelerated stress testing conditions.

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