The single-mode core of this fiber is doped with ytterbium. It is then surrounded by a silica cladding and covered with a low-index protective coating. The resulting double clad fiber is used for single-mode fiber lasers and amplifiers operating in the 1040 to 1200 nm range.

The fiber enables fiber lasers and amplifiers with good beam profile characteristics, high wall plug efficiencies, compact footprints, superior reliability, and maintenance-free operation. It also accommodates high energies
Unit of Measure


Cladding Numerical Aperture

N/A ≥ 0.45 µm

Coating Outer Diameter

N/A 325 ± 15 µm

Optical Properties

Coating Diameter

N/A 400 ± 15 µm

Optical Specifications

Background Loss at 1150 nm

N/A ≤ 10 dB/km

Cladding Loss at 1100 nm

N/A ≤ 10 dB/km

Cladding Absorption at 915 nm

N/A 0.8 ± 0.15 dB/m

Physical and Material Parameters

Coating Type

N/A TrueClad™ Low Index

Fiber Geometry

N/A Star Shape


Proof Test

N/A 100 kpsi


Effective Area @ 1070 nm

N/A 170 +10/-15 µm2

Fundamental Mode Bend Loss @Ø12

N/A ≤ 0.1 dB/m

Higher Order Mode Bend Loss @Ø2

N/A ≥40 dB/m

Fiber Outside Diameter

N/A 253 ± 4 µm

Coating/Cladding Concentricity Error

N/A ≤ 10 µm

Primary Coating Diameter

N/A 325 ± 15 µm

Secondary Coating Diameter

N/A 400 ± 15 µm