What Materials Can a Fiber Laser Cut? Complete 2026 Guide

Fiber laser is the workhorse of metal cutting in 2026. But “what can a fiber laser cut?” is more nuanced than just “metal.” This guide is the definitive reference: every material category, what works, what doesn’t, what’s dangerous, and the power required for each.

How fiber laser cuts (1-minute version)

Fiber lasers emit light at 1.06 µm wavelength — short-infrared. This wavelength is absorbed efficiently by:

Metals — high absorption, especially at higher temperatures (positive feedback for cutting)
Some plastics with carbon black filler (acrylic with pigments)
Some ceramics (silicon, partially)

And NOT absorbed by:

Pure transparent materials (clear acrylic, glass, water)
Organic materials (wood, paper, fabric) — these absorb 10.6 µm CO2 wavelength much better

So fiber = metal cutter, and CO2 = organic cutter. (Read our fiber vs CO2 comparison for more.)

✅ Materials fiber laser cuts excellently

Mild steel (carbon steel)

Thickness range: 0.3 – 25 mm depending on power
Power needed: 500 W (1 mm) to 6000 W (20 mm)
Assist gas: O2 for budget + thick, N2 for clean visible-edge
Quality: Clean, single-pass cut with minimal dross
Industry use: Construction, decorative panels, machinery, signage

Stainless steel (304, 316, 316L)

Thickness range: 0.3 – 15 mm
Power needed: 600 W (1 mm) to 4000 W (10 mm)
Assist gas: N2 only (for non-oxidized clean edge)
Quality: Mirror-clean edge possible with right N2 pressure
Industry use: Food/medical equipment, marine, decorative high-end

Aluminum (1000, 5000, 6000 series)

Thickness range: 0.3 – 10 mm (machine-dependent — needs back-reflection rating)
Power needed: 700 W (1 mm) to 3000 W (6 mm)
Assist gas: N2 only
Quality: Clean with good setup, prone to reflection issues
Caution: Highly reflective — requires fiber laser with optical isolator
Industry use: Aerospace, electronics, lightweight panels, sign making

Brass

Thickness range: 0.3 – 6 mm
Power needed: 800 W (1 mm) to 2500 W (4 mm)
Assist gas: N2 (air for budget)
Quality: Clean, slight burr
Industry use: Decorative, instrument plates, plumbing
Caution: Very reflective — same machine rating concerns as aluminum

Copper

Thickness range: 0.3 – 4 mm (challenging beyond this)
Power needed: 1000 W (0.5 mm) to 3000 W (3 mm)
Assist gas: N2
Quality: Workable
Industry use: Electronics, electrical, decorative
Caution: Most reflective common metal — only top-tier fibers handle it

Galvanized steel

Thickness range: 0.3 – 6 mm
Power needed: same as mild steel
Assist gas: Air or O2
Quality: Clean cut on body; zinc edge can require touch-up
Caution: Zinc fumes are toxic — ensure strong ventilation

Titanium

Thickness range: 0.3 – 8 mm
Power needed: 800 W (1 mm) to 3000 W (5 mm)
Assist gas: N2 or argon (prevents discoloration)
Quality: Clean
Industry use: Aerospace, medical implants, jewellery

Inconel, Hastelloy, other nickel alloys

Thickness range: 0.3 – 6 mm
Power needed: 1200 W+
Assist gas: N2
Quality: Clean, slower than steel
Industry use: Aerospace, chemical industry

⚠️ Materials fiber laser cuts marginally (CO2 preferred)

Anodized aluminum

Can cut, but anodizing layer scorches at edges
Better to cut THEN anodize

Carbon fiber composites

Possible at high power, but produces toxic dust
CO2 generally cleaner for composites
Better off using waterjet for clean composite cuts

Painted / coated metals

Coating burns/discolors at cut edge
Better: cut bare, paint after

Powder-coated panels

Burns coating at edge (~3 mm zone)
Production tip: cut on bare metal, apply coating after assembly

❌ Materials fiber laser SHOULD NOT cut

Wood

1.06 µm wavelength reflects/scatters in wood instead of absorbing
Inefficient — CO2 is 10-100x faster at any wood
Possible with very high power but not economical

Paper, card, cork

Same as wood — wrong wavelength

Acrylic (PMMA, transparent)

Fiber lacks absorption — beam passes through
CO2 is the standard tool for acrylic

Fabric, leather

Inefficient cutting
Possible thin synthetics if dyed dark, but CO2 wins

Glass

Fiber bounces off most glass
Use waterjet or specialty diamond/ablation

Stone, marble

Use waterjet for these

❌❌ Materials NEVER to fiber laser cut (toxic / dangerous)

PVC (vinyl)

Produces hydrochloric acid (HCl) gas when cut
Corrodes laser optics, your ventilation system, your lungs
Never cut PVC on any laser

ABS plastic

Releases cyanide compounds
Same — never

Polycarbonate

Releases chlorine + other toxic
Bad for optics and operator
Some sources say “yes with extreme caution” — we say don’t

Fiberglass / epoxy composites

Toxic resin fumes
Use waterjet or mechanical methods

Beryllium copper

Toxic dust
Specialty machines + extra precautions only

Power class buying guide

If you’re shopping for a fiber laser and want to know what power class to get for your work:

20-50 W desktop fiber (typically galvo-head)

Use for: Engraving + marking. Limited cutting capability.
Cuts: 0.5-1 mm stainless steel sheet maybe; 0.3 mm thin sheets up to 1 mm with multi-pass
Cost: $2-5K
Best for: Jewellery makers, marking serial numbers, engraving small parts

500-1000 W gantry fiber

Use for: Hobbyist to small business cutting
Cuts: ≤4 mm steel, ≤2 mm aluminum, ≤2 mm stainless
Cost: $7-15K
Best for: DXFForge-style decorative work, small fab shops, prototypes

1500-3000 W gantry fiber

Use for: Production small/medium business
Cuts: ≤8 mm steel, ≤5 mm aluminum, ≤5 mm stainless
Cost: $15-40K
Best for: Cabinet making, machinery panels, signage business

4000-6000 W gantry fiber

Use for: Heavy production
Cuts: ≤16 mm steel, ≤8 mm stainless, ≤8 mm aluminum
Cost: $40-100K
Best for: Industrial fabrication, structural components

8000-15000 W gantry fiber

Use for: Heavy industrial production
Cuts: ≤25 mm steel, ≤16 mm aluminum
Cost: $100K-300K+
Best for: Shipbuilding, agricultural equipment, structural plate

2026 industry trends

A few updates worth knowing:

Power per dollar continues to drop — 1000 W fibers in 2026 sell for what 500 W cost in 2022. Buy more power than you think you need; you’ll grow into it.
Galvo + gantry combos exist now — single machine that switches between fast small-feature engraving (galvo) and large-area gantry cutting. Premium price but versatile.
Auto-focus is universal — even budget machines now ship with capacitive auto-focus. Don’t buy without it.
Cloud / app integration — many 2026 machines have phone apps for remote monitoring + alarm. Useful for unattended runs.

What this means for DXFForge customers

Every design in our catalog is fiber-laser-optimised for the 500-2000 W class — by far the most common production fiber range. Cuts cleanly at typical settings:

~1 mm stainless: 600-800 W, 100-150 mm/s
~2 mm mild steel: 800-1000 W, 50-80 mm/s
~2 mm aluminum: 1000 W, 50 mm/s

If you have anything in the 500-3000 W range, every file in the bundle will run cleanly on your machine.

For specific material recommendations per design, check the product page — each lists tested materials in the Specs section.

Bottom line

Fiber laser is unmatched for cutting metal in 2026. It’s not the right tool for wood, paper, acrylic, or anything organic. And it’s actively dangerous for PVC, ABS, polycarbonate, and similar plastics.

If your work is metal, get a fiber. If your work is wood / acrylic / leather, get a CO2 instead. If your work is both, get both — they’re complementary tools, not replacements for each other.

Browse fiber-laser-ready designs →