Sources scaled past 100 kW faster than applications found uses for them

Combining fiber outputs to extreme powers is an engineering achievement with a thin industrial demand curve behind it.

By LasersNews Desk·22 Jul 2026·1 min read

Close-up of a high-tech laser cutter operating indoors with blue lighting. — Photo by Opt Lasers from Poland on Pexels

Demonstrations of fiber laser output well above 100 kW appear regularly, achieved by combining many individual sources. The engineering is real. The industrial application list is short, and it is worth being precise about why.

The combination methods

Incoherent beam combining feeds multiple fiber outputs into a single larger delivery fiber. Total power adds; beam quality degrades roughly in proportion, since the combined output fills a larger fiber.

Spectral beam combining uses a dispersive element to overlay beams of slightly different wavelengths into a single path, preserving beam quality better at the cost of complexity.

Coherent combining phase-locks sources so they add as a single beam. It preserves beam quality best and is the hardest to maintain in an industrial environment.

The material limit

The reason extreme power has found limited industrial use is that most processes stop benefiting well before it. In cutting, melt ejection limits speed, so added power heats surroundings rather than cutting faster. In welding, keyhole stability and spatter degrade as power rises past what the joint needs.

Very thick section welding and cutting genuinely benefit, and there are applications in decommissioning and heavy fabrication. But that is a modest market compared with the general fabrication that drives laser sales.

Where the demand actually is

Directed energy applications outside conventional manufacturing account for a substantial share of interest in extreme power, and those requirements — atmospheric propagation, long standoff, beam quality over distance — differ considerably from a cutting head's.

What the trend does deliver

The useful spillover is at lower powers. Techniques developed for combining and thermal management improve reliability and beam quality in the 10 to 30 kW range where industrial demand concentrates. Component robustness developed for extreme systems flows into ordinary ones.

That is the honest summary: extreme power demonstrations are a research and defence programme whose engineering byproducts benefit the industrial market, rather than a preview of what fabrication shops will buy.

This article was produced by the LasersNews AI desk and reviewed by our editors.