What Can a Fiber Laser Engrave? Materials That Work (and Don't)
Quick answer
A fiber laser engraves and marks nearly all metals (stainless steel, aluminum, brass, copper, titanium, gold, silver), anodized and powder-coated surfaces, many hard plastics, and some stone like slate. It struggles with clear glass, clear acrylic, most wood and fabric, because those materials don't absorb its 1064 nm wavelength well.
If you're thinking about spending $1,000 or more on a fiber laser, the first question is simple: will it actually work on the things you want to make? The short answer is that fiber lasers are metal specialists. They're fantastic at what they're good at and frustrating at what they're not.
This guide walks through every common material, what result you can expect, and where another laser type would serve you better.
Why fiber lasers are so good on metal
A fiber laser produces infrared light at about 1064 nanometers. Metals absorb this wavelength very efficiently, so the energy goes straight into the surface instead of bouncing off. A CO2 laser, by comparison, works at 10,600 nm, which bare metal mostly reflects. That single difference in wavelength explains almost everything about what a fiber laser can and can't do. If you want the full picture of how the different machines compare, see our guide to the main types of laser engravers.
Materials a fiber laser handles well
| Material | Result | Notes |
|---|---|---|
| Stainless steel | Excellent | Light marks, deep engraving, black annealing, and colors with a MOPA source |
| Aluminum (bare) | Excellent | White to grey marks, deep engraving possible |
| Anodized aluminum | Excellent | Removes the dye layer for crisp white marks |
| Brass and bronze | Very good | Clean, high-contrast marks |
| Copper | Good | Reflective, so it needs more power or slower passes |
| Titanium | Excellent | Can produce a range of oxide colors |
| Gold and silver | Very good | Common for jewelry; reflective, so test carefully. See our jewelry engraving guide |
| Carbon and tool steel | Excellent | Popular for knives, tools and parts |
| Powder-coated tumblers and mugs | Excellent | Removes the coating to reveal the steel underneath |
| Painted metal | Very good | Ablates the paint layer |
| Hard plastics (ABS, PC, many engineering plastics) | Good | Depends heavily on the plastic and its additives |
| Slate and some stone | Good | Light, readable marks |
| Ceramics with a glaze | Fair | Results vary by glaze |
If stainless is your main material, read what you can do on stainless steel, then follow our step-by-step guide on how to laser engrave stainless steel. For aluminum, read how to engrave bare and anodized aluminum.
Materials a fiber laser struggles with
Clear glass. Glass is transparent at 1064 nm, so most of the energy passes straight through. You'll either get nothing or random chipping. A CO2 or UV laser is the right tool here.
Clear acrylic. Same problem as glass. Colored or black acrylic sometimes marks, but clear acrylic doesn't. For acrylic work a CO2 laser is far better because it can engrave and cut it cleanly.
Wood. A fiber laser can scorch or lightly mark wood, but it's slow, uneven, and nothing like the results you get from a diode or CO2 machine. If wood is half of what you plan to make, a fiber laser alone isn't the right choice.
Leather, fabric and paper. Possible on some darker materials, but inconsistent, and there's a fire risk with low-density materials. CO2 and diode lasers are the standard here.
Cutting thick material. A desktop fiber engraver is not a fiber cutting machine. Higher-power units can slowly cut very thin metal sheet, but if cutting is your goal, you need a dedicated cutter.
What about engraving depth?
Depth depends mostly on power, the number of passes and the material. A 20W fiber laser can engrave readable depth into stainless steel with enough passes, while 50W and above does it much faster. Our guide on how much laser power you actually need covers this in detail, and how deep a fiber laser can engrave gives realistic depths.
Fiber, CO2 or both?
Here is a simple way to decide:
- Mostly metal, jewelry, tools, tumblers, tags or parts: a fiber laser is the right primary machine.
- Mostly wood, acrylic, leather, glass or cutting: start with CO2 (or diode on a tight budget).
- A real mix of both: many small businesses end up owning two machines, a fiber for metal and a CO2 for everything else.
If you're torn between the two, our fiber vs CO2 laser comparison goes deeper. And if you're ready to look at actual machines, see our picks for the best fiber laser engraver for metal.
Frequently asked questions
Can a fiber laser engrave glass?
Not reliably. Clear glass lets the 1064 nm beam pass through, so results are poor or inconsistent. Coated glass or glass treated with a marking compound can work, but a CO2 or UV laser is the better tool for glass.
Can a fiber laser engrave wood?
It can mark wood, but slowly and unevenly. If wood is a big part of your work, a CO2 or diode laser will give much better results.
Can a fiber laser engrave plastic?
Many hard plastics mark well, especially dark ones. Results depend on the exact plastic and its additives, so always test first. Never laser PVC or vinyl, which release corrosive and toxic gas.
Can a fiber laser cut metal?
High-power units can cut very thin sheet slowly, but desktop fiber engravers are built for marking and engraving, not cutting. See can a fiber laser cut metal for the limits.
What is the best fiber laser for a beginner?
For most beginners a 20W to 30W galvo fiber laser covers jewelry, tags, tumblers and most metal marking. Read our beginner's guide to laser engraving before you buy.