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What is a fiber laser engraver?
Short answer
A fiber laser engraver generates its beam inside an optical fiber doped with rare-earth elements, producing a 1064 nm wavelength that metal absorbs efficiently. A galvo (mirror) system steers the beam at high speed, so it permanently marks, etches, and engraves metal — and marks many plastics — with no contact and no consumables. It differs from a CO2 laser, whose longer wavelength suits non-metals; fiber is the metal specialist. Boss’s FM Series are fiber markers/engravers, while the FC Series are high-power fiber cutters for sheet metal.
How a fiber laser is different
Instead of a gas tube, a fiber laser builds its beam in a rare-earth-doped optical fiber, giving a short 1064 nm wavelength and a fine focus. Metal absorbs it far better than the CO2 wavelength, so fiber is fast, precise, and permanent on metal. A galvo scanner steers the beam across a marking field for fast marking without a heavy gantry.
What it’s used for
Serial numbers, barcodes, logos, tools, firearms, jewelry, and industrial part marking — any permanent metal mark — plus many plastics. It doesn’t engrave wood, glass, or clear acrylic well (use CO2), and a fiber marker doesn’t cut metal (that’s a fiber cutter). See what can a fiber laser engrave? and what is laser engraving?
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What is a fiber laser engraver?
A machine that generates a 1064 nm beam in an optical fiber and uses a galvo scanner to mark, etch, and engrave metal (and many plastics) permanently, with no contact or consumables. Metal absorbs its wavelength well, making it the standard for industrial marking.
What is a fiber laser cutter?
A high-power fiber laser built to cut sheet metal rather than mark it. Where a fiber marker is tens of watts and marks the surface, a fiber cutter is kilowatt-class and cuts all the way through metal. Boss’s FC Series are fiber cutters.
What is fiber laser engraving (and a fiber laser engraving machine)?
Fiber laser engraving is permanently marking or engraving a surface — usually metal — with a 1064 nm fiber beam. A fiber laser engraving machine is the equipment that does it: a fiber source, a galvo marking head, and software. It excels on metal and many plastics.
Related: What is laser engraving? · How do you laser engrave metal? · Metal marking applications
Materials
What can a fiber laser engrave?
Short answer
A fiber laser is the metal specialist: it engraves, etches, and anneals all common metals — steel, stainless, aluminum, brass, copper, titanium, and even gold and silver — and it marks many plastics with high contrast for part numbers and labels. Its 1064 nm wavelength is absorbed by metal but passes through clear glass and acrylic, so it can’t engrave those, and it’s a poor choice for wood (it scorches rather than marking cleanly). In short: fiber is unbeatable on metal and good on many plastics; for wood, glass, leather, and clear acrylic, use a CO2 laser. Boss’s FM Series fiber markers cover this metal work.
Metals (and plastics) are fiber’s strength
Metal absorbs fiber’s 1064 nm efficiently, so a fiber marker engraves, etches, and anneals stainless, mild steel, aluminum, brass, copper, titanium, and precious metals — fast, permanent, no coating. It also marks many plastics with strong contrast (serial numbers, barcodes, logos, tools, ID). Boss FM Series markers (and FC fiber cutters for cutting) live here.
What fiber can’t engrave well
- Clear glass & clear acrylic — beam passes through; use CO2.
- Wood — poorly absorbed; scorches rather than marking cleanly. CO2 for wood.
- Leather, paper, fabric — organic materials are a CO2 job.
Pick fiber for metal and plastic ID; CO2 for wood, glass, leather, acrylic.
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What can a fiber laser engrave?
All common metals — steel, stainless, aluminum, brass, copper, titanium, gold, and silver — plus many plastics for high-contrast marking. It can’t engrave clear glass or acrylic (the beam passes through) and is a poor choice for wood, which it scorches. For those, use a CO2 laser.
What materials can a fiber laser engrave?
Metals are its specialty, and it marks many plastics well. Fiber anneals, etches, and engraves bare metal with no coating, making it ideal for industrial ID. Organic materials like wood, leather, and paper, plus clear glass and acrylic, are better suited to a CO2 laser.
What can a 20W or 60W fiber laser engrave?
A 20–60 W fiber marker engraves and etches metals and marks many plastics; higher wattage mostly means faster marking and deeper engraving, not different materials. These are markers, though — they engrave metal but do not cut it.
Can a fiber laser engrave guns or firearms?
Yes — fiber markers are commonly used to engrave serial numbers, logos, and custom designs on firearm metal components, since they mark steel and aluminum permanently and precisely. Follow all applicable laws for marking firearms.
Related: How do you laser engrave metal? · Can a fiber laser engrave wood? · Metal marking applications
Marker vs. Cutter
Can a fiber laser cut metal?
Short answer
Yes — a fiber laser is the tool for cutting metal, but only a kilowatt-class fiber cutter, not a fiber marker. Cutting steel, stainless, aluminum, brass, and copper takes roughly 1 kW and up; the 20–100 watt fiber markers people ask about only mark metal — a 30 W or 50 W fiber will not cut even thin sheet reliably. Thickness scales with power (about 5 mm stainless at 1 kW up to 20–25 mm at 6 kW). Fiber also doesn’t cut non-metals — it passes through glass and acrylic and scorches wood.
Marker vs. cutter: the key distinction
“Fiber laser” covers two machines. A fiber marker (20–100 W, Boss FM) etches/engraves the surface but can’t cut through. A fiber cutter (kilowatt-class, Boss FC) focuses far more power and uses assist gas to cut clean parts from sheet and tube. A fiber laser cuts metal — if it’s a cutter.
Power, thickness, and non-metals
Cutting starts ~1–2 kW for thin-to-medium sheet and scales up (~5 mm stainless at 1 kW to 20–25 mm at 6 kW). A 30 W or 50 W fiber is a marker and won’t reliably cut even 1 mm stainless. Fiber only cuts metal — it passes through glass/acrylic and scorches wood. See can a laser cutter cut metal?, how many watts to cut metal?, and how thick can a laser cut?
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Can a fiber laser cut metal?
Yes, if it’s a kilowatt-class fiber cutter. Fiber is absorbed by metal, so a fiber cutter slices steel, stainless, aluminum, brass, and copper cleanly with an assist gas. A fiber marker (20–100 W) only marks — it doesn’t cut.
Can a 30W or 50W fiber laser cut metal?
No — those are marking wattages. A 30 W or 50 W fiber etches and engraves the metal surface but cannot cut through it; it won’t reliably cut even 1 mm stainless. Cutting needs a kilowatt-class fiber cutter.
Can a 50W fiber laser cut 0.8mm or 1mm stainless steel?
Not reliably. A 50 W fiber marker is built to mark, not cut, so even thin 0.8–1 mm stainless is beyond it for clean, repeatable cutting. For thin sheet you want at least a ~1 kW fiber cutter.
How do you cut 1-inch or thicker metal with a fiber laser?
Thick metal needs high power — roughly 6 kW handles around 20–25 mm (about 1 inch), and the largest industrial systems (12 kW and up) cut thicker. Pair the power with the right assist gas and settings for the metal. See how thick can a laser cut?
Will a fiber laser cut non-metals?
No. Fiber is for metal — its wavelength passes through glass and clear acrylic and scorches wood, so it doesn’t cut non-metals. Use a CO2 laser for wood, acrylic, leather, and paper.
Related: Can you laser cut stainless steel? · How much does metal laser cutting cost? · Metal cutting applications
Material Limits
Can a fiber laser engrave wood?
Short answer
Technically a fiber laser can mark some wood, but it is not the right tool. Fiber’s 1064 nm wavelength is poorly absorbed by wood, so instead of a clean mark the beam tends to scorch and burn unpredictably, and the uncontrolled heat is a real fire risk. Results are inconsistent compared with the dark, detailed engraving you get from a CO2 laser. For wood — and for leather, paper, and other organic materials — use a CO2 laser, which is absorbed cleanly and is the industry standard. Reach for fiber when you’re working metal, not wood.
Why fiber is the wrong tool for wood
Wood doesn’t absorb fiber’s 1064 nm well, so the energy doesn’t convert into a clean mark — you get scorching, inconsistent darkness, and uncontrolled heat, which on flammable material is a genuine fire hazard. Even when it “works,” it rarely matches the crisp dark engraving wood is known for.
Use a CO2 laser for wood
A CO2 laser’s 10.6 micron wavelength is absorbed cleanly by wood, giving controlled, detailed, repeatable engraving and clean cuts — the standard for wood, leather, paper, and acrylic. Mostly wood? Buy CO2; keep fiber for metal. See how do you laser cut wood? and what can a fiber laser engrave?
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Can a fiber laser engrave wood?
It can leave a mark on some wood, but it’s not recommended. Fiber’s wavelength is poorly absorbed by wood, so it scorches unpredictably and poses a fire risk rather than marking cleanly. Use a CO2 laser for wood.
Can you engrave wood with a fiber laser / will a fiber laser engrave wood?
Only poorly. The results are inconsistent and the uncontrolled heat is a safety hazard on a flammable material. A CO2 laser is absorbed cleanly by wood and gives the dark, detailed engraving you actually want.
What laser is best for engraving wood?
A CO2 laser. Its 10.6 µm wavelength is well absorbed by wood for controlled, repeatable engraving and clean cuts. Fiber is for metal; CO2 is for wood, leather, paper, and acrylic.
Related: How do you laser cut wood? · Can a fiber laser engrave acrylic? · Wood & natural materials applications
Material Limits
Can a fiber laser engrave acrylic?
Short answer
Not clear acrylic — a fiber laser’s 1064 nm beam passes through transparent acrylic without being absorbed, so it leaves no mark. Fiber can mark some dark or pigmented plastics, but results are inconsistent and it often struggles. For acrylic — cutting glossy edges or engraving frosted white — the right tool is a CO2 laser, which acrylic absorbs beautifully. So use fiber for metal (and some plastic ID marking) and CO2 for acrylic.
Why fiber struggles with acrylic
Clear acrylic is essentially transparent to fiber’s 1064 nm, so the beam goes through rather than heating the surface — no engraving, no cut. Some dark/pigmented plastics absorb enough to take a fiber mark, but clear and light acrylics generally won’t, and even dark ones can be inconsistent. It’s a wavelength limitation, not a settings fix.
Use a CO2 laser for acrylic
Acrylic + CO2 is a near-perfect match: clean glossy cut edges and bright frosted-white engraving on cast acrylic. Full process (cast vs extruded, settings, finishing): can you cut acrylic with a laser cutter? For plastic marking broadly: can you laser engrave plastic?
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Can a fiber laser engrave acrylic?
Not clear acrylic — the 1064 nm beam passes through it without marking. A fiber laser can mark some dark or pigmented plastics, but results vary. For cutting or engraving acrylic, use a CO2 laser, which acrylic absorbs beautifully.
Can a fiber laser mark any plastic?
It can mark many dark or pigmented plastics for part numbers and labels, and some plastics include additives that respond well to fiber. Clear and transparent plastics like clear acrylic generally don’t mark, since the beam passes through. Test the specific plastic first.
What laser should you use for acrylic?
A CO2 laser. Its 10.6 µm wavelength is absorbed by acrylic, giving glossy flame-polished cut edges and bright frosted engraving on cast acrylic. Fiber is for metal and some plastic ID, not acrylic.
Related: Can you cut acrylic with a laser cutter? · Can you laser engrave plastic? · Acrylic & plastics applications
Material Limits
Can a fiber laser engrave glass?
Short answer
No — a fiber laser cannot engrave clear glass. Its 1064 nm beam isn’t absorbed by glass; it passes straight through without leaving a mark. To engrave glass — tumblers, awards, panels, photos — you want a CO2 laser, whose 10.6 µm wavelength frosts the surface cleanly. Fiber is the tool for metal and many plastics, not glass. So for a glass cup or any glassware, use a CO2 laser.
Why fiber doesn’t mark clear glass
Engraving needs the material to absorb the beam. Clear glass is transparent to fiber’s 1064 nm light, so the energy passes through instead of heating the surface — no mark. Same reason fiber can’t cut clear acrylic. It’s a wavelength property, not a settings problem.
Use a CO2 laser for glass
A CO2 laser is absorbed at the glass surface and frosts it into a bright white mark — the right tool for glassware, awards, and photos. Full technique: how do you laser engrave glass? Keep fiber for metal and plastics.
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Can a fiber laser engrave glass?
No — a fiber laser can’t engrave clear glass. Its 1064 nm beam passes through glass without being absorbed, so it leaves no mark. Use a CO2 laser, which frosts the glass surface cleanly.
Can you engrave a glass cup with a fiber laser?
No. A clear glass cup is transparent to the fiber wavelength, so the beam goes through it without marking. Engrave glassware on a CO2 laser, ideally with a rotary attachment for the round surface.
Can you use a fiber laser to engrave glass at all?
Not clear glass. The only marks fiber can make on glass-like items are on coatings or paint applied to the surface, not the glass itself. For real glass engraving, a CO2 laser is the correct tool.
Related: How do you laser engrave glass? · Can a CO2 laser engrave glass? · Glass, stone & ceramic applications
Marking metal, or cutting it? Two different fiber machines.
Marking parts, tags, and serial numbers is FM Series territory — fiber markers built for permanent metal ID. Cutting sheet metal is the FC Series — kilowatt-class fiber cutters. Know which job you’re doing and the machine choice makes itself.