Lumentum’s very large mode area (VLMA), extra-large mode area (XLMA), and ultra-large-core (ULC) Yb-doped fibers—with core diameters exceeding 400 µm—are engineered for high-performance amplification of femtosecond, picosecond, and nanosecond pulses at the highest energy levels.
Manufactured using proprietary vapor-phase deposition technology, these fibers deliver high efficiency and photodarkening-free operation. Precise control over geometry and deposition enables high-brightness, single-mode performance in all-solid VLMA fibers, while also supporting scalable production of few-mode and multimode variants.