What Materials Can a Laser Cut or Engrave? Diode vs. CO2 vs. Fiber

“Can my laser cut this?” has two parts: can the light be absorbed by the material at all, and is it safe to burn? The first depends on the laser’s wavelength, not its wattage. A 40 W blue diode still can’t cut clear acrylic, because the light passes through. This guide walks through the common materials by laser type. It follows the same conservative data as our material checker, which covers typical hobby machines: 10–40 W blue diodes, 40–55 W desktop CO2, 20–60 W fiber and 3–5 W UV. Your machine’s own material library and settings come first.

How to read this

• Cuts: cuts through, with thickness depending on power, passes and air assist.
• Engraves: marks or engraves well, but doesn’t cut.
• Only with prep: needs paint, tape or a marking compound to take a mark.
• Doesn’t work / never: no useful result, or hazardous.

Each material below links to its entry in the checker so you can share or bookmark it.

Wood and paper

Basswood and birch plywood: every type engraves; diode and CO2 cut. It’s the default laser material. A 10 W diode cuts about 3 mm in a pass or two; 20–40 W diodes and CO2 go thicker. Maker claims in our data include 8 mm basswood in one pass for the xTool M2 10W, 18 mm cherry in one pass for the xTool S1 40W, and 18 mm basswood in one pass for the xTool P2S. Cheap plywood has glue voids that leave uncut spots, so buy laser-grade sheets, like the 3 mm basswood 12-pack (about $25).

Solid hardwood: engraves beautifully on every type. Dense hardwoods cut slowly on diodes; keep thickness modest and use air assist.

MDF: cuts and engraves, with a catch. The resin binder makes heavy smoke with a strong smell. Vent it outdoors or through a proper filter.

Paper and cardboard: diode and CO2 cut fast at low power. It ignites easily, so never leave the job unattended. Fiber doesn’t work.

Cork: diode and CO2 cut thin sheets cleanly. Popular for coasters; watch for flare-ups.

Plastics

Clear cast acrylic: CO2 only (UV engraves). This is the single biggest reason people buy CO2. Blue diode light passes straight through, so diodes can’t cut it, while a CO2 cuts it with flame-polished edges. xTool lists transparent and mirrored materials, mostly blue materials and some extruded acrylic among the things its S1 diode isn’t suited to. Prefer cast over extruded acrylic for engraving. Our cheapest CO2 is the OMTech K40+ at about $760–$800; the P2S claims 20 mm acrylic in one pass. See clear cast acrylic sheets (about $46 for 10).

Black and opaque colored acrylic: diodes can cut thin sheets. Dark acrylic absorbs blue light. Our checker conservatively says around 3 mm with enough power and passes; higher-power diode heads claim more (xTool rates the M2’s 20 W head at 8 mm black acrylic in one pass). Creality’s own listings disagree on whether the 10 W Falcon A1 cuts acrylic, so treat that as unconfirmed. Blue and transparent colors still don’t work on a blue diode.

Laser-safe stamp rubber: CO2 cuts, diode engraves. Only rubber sold as laser-safe. Neoprene and many synthetic rubbers contain chlorine; treat them like PVC.

Natural materials and textiles

Veg-tanned leather: diode and CO2 cut and engrave. Chrome-tanned leather releases chromium compounds, and faux leather is often PVC. Never laser those. Leatherette patch blanks are cheap test stock, though they’re not for fiber-only machines.

Cotton, felt and denim: diode and CO2 cut with a sealed edge. Synthetics melt and some release toxic fumes, so check the fiber content.

Stone, glass and ceramic

Slate and dark stone: engraves on every type. It gives a light gray mark on black, which is why slate coasters are a best-selling blank. Lasers don’t cut stone.

Glass: CO2 frosts it; UV marks it; diode needs prep; fiber doesn’t work. Blue diodes pass through clear glass, so you need a coating. xTool’s F2 FAQ says the same about its galvo machine: apply a black coating or anti-reflection layer first.

Glazed ceramic tile and mugs: prep on diode, CO2 and fiber. Most hobbyists paint the glaze first (the “tile method”) or use a marking compound. UV marks some glazes directly.

Metal

Metal is where buyers get misled most, because listings say “engraves stainless” without saying how well.

Anodized aluminum: engraves on every type. The laser removes the dyed layer for a crisp white mark. Black anodized business cards make good test pieces.

Powder-coated and painted metal: engraves on every type. The laser burns off the coating to reveal the metal. This is how most tumbler engraving works, and round items need a rotary. See best laser engraver for tumblers.

Bare stainless steel: fiber and UV engrave; diode and CO2 need marking spray. Some makers list stainless as diode-engravable, and the M2, S1, Falcon A1 Pro, Atomstack A20 Pro V2 and Longer Ray5 can leave a mark, but it’s slow, dark and low-contrast. Fiber lasers mark and deep-engrave bare stainless, and MOPA fibers like the xTool F2 Ultra can color-mark it. The F2’s 5 W IR head also color-marks stainless, titanium and copper, per xTool.

Bare aluminum, brass, silver and gold: fiber only (and UV). These reflective metals bounce diode and CO2 light. Fiber is the tool for jewelry and bare-metal work. The ComMarker B4 20W is the most affordable true fiber in our data (about $1,399–$1,719, now marked clearance by ComMarker), and higher-power fibers can cut thin sheet.

Materials you must never laser

These are “never” for every laser type in our checker, and they match university lab do-not-cut lists such as the University of Illinois’s:

Some maker lists are looser than ours. If any source tells you a plastic is fine and our checker says never, don’t risk it. When you can’t identify a plastic, don’t laser it. Our safety guide covers fumes and fire.

Which laser type fits your material list

• Mostly wood, leather, slate, coated tumblers and dark acrylic: a blue diode. The Falcon A1 Pro (about $1,099) is an enclosed 20 W example.
• Anything clear or glass: CO2, from the K40+ to the P2S and P3.
• Bare metal plus organics: a dual-source machine like the xTool F2 (about $1,219) or F1 Ultra.
• Mostly bare metal: a fiber laser. See best laser engraver for metal.

Clear acrylic and bare precious metals rarely share one machine. If both matter, plan on two lasers, or read diode vs CO2 vs fiber to decide which to buy first. The laser matcher filters our lineup by the materials you tick.

Bottom line

Wavelength decides the material; power decides the thickness. Blue diodes handle most craft materials except clear acrylic, glass and bare metal; CO2 adds clear acrylic and glass; fiber owns bare metal. Coated metal, anodized aluminum and slate work on almost anything. And the never list is short but absolute.