Can You Laser Cut Wood? An Honest Laser and Photonics Review

Every week, someone asks me: can you laser cut wood? It's a simple question with a frustratingly conditional answer. It depends on the laser wavelength, the material thickness, and whether you have air assist.

I'm not a lab scientist. I'm the person at Laser-Photonics who handles laser system orders and then deals with the aftermath when something doesn't work. As of January 2025, I've been in this role for eight years. I've personally made (and documented) 14 significant mistakes, totaling roughly $47,000 in wasted budget. This guide is my attempt to make sure you don't repeat them.

This isn't a polished lab report. It's a laser and photonics review from the production floor: wood cutting, slate engraving, fiber lasers (including the IPG Photonics fiber laser we've tested), and the accessories that are actually worth the money.

Why there is no universal answer

When I first started in 2017, I assumed a laser is a laser. I thought the highest wattage machine would do everything: cut wood, engrave slate, weld aluminum, you name it. Three years later, after a $8,000 demo gone wrong, I learned the word 'wavelength' matters more than power.

Here's the quick physics: CO2 lasers emit at 10.6 micrometers, diode lasers at roughly 450 nanometers, and fiber lasers at 1064 nanometers. Wood loves to absorb 10.6 micrometers. It does not love 1064 nanometers. That's why an IPG Photonics fiber laser, for all its brilliance on metal, will char a piece of oak without cutting through.

From the outside, laser cutting looks like pointing a magic wand and pressing start. The reality is that wavelength, focal length, and material prep decide whether you get a clean edge or a smoke-filled workshop.

Scenario A: You have a CO2 laser

If you have a CO2 laser, you're in the best position for both wood cutting and slate engraving.

Wood cutting: yes, this is your lane

In our test runs, a 60W to 100W CO2 machine can cut 6mm to 12mm plywood with reasonably clean edges. At 80W, we've cut 6mm birch plywood in a single pass at about 12mm per second. Higher power helps, but the edge quality depends as much on air assist and lens focus as on wattage.

Slate engraving: yes, with a caveat

CO2 lasers produce that classic white frosted look when you laser engrave slate. The caveat is airflow: without air assist, the fine slate dust scorches and leaves a yellow-brown shadow around the engraving. In 2023, we engraved 380 slate coasters for a client. The first 12 looked terrible because I'd set the air assist too low. We adjusted, reran them, and the rest were fine. That little mistake cost $170 in wasted slate and a late afternoon.

Scenario B: You have a diode laser

Diode lasers are common in desktop and small-shop setups. They're cheaper and can do more than people expect, but they have limits.

Wood cutting: only for thin material

A 10W or 20W diode laser can cut 3mm basswood and thin plywood, but it'll need multiple passes. Cutting 18mm hardwood with a 10W diode is not a plan; it's a fire hazard and a char factory. I tried it once in 2019, and the smell stayed in the shop for two days.

Slate engraving: yes, but the contrast is different

Diode lasers mark slate in a dark gray or brown instead of white. That can look great for modern branding, but if your client expects the classic white slate sign, a diode laser will disappoint them. Run a speed test on their exact slate before promising a deadline.

Scenario C: You have a fiber laser (including an IPG Photonics fiber laser)

This is the scenario that gets people into trouble. Fiber lasers are incredible for metal marking and cutting. They are the wrong tool for wood cutting.

Wood cutting: don't do it

If you own an IPG Photonics fiber laser or any 1064nm system, please don't use it to cut wood. In September 2022, I submitted a demo piece on 12mm oak to a potential client. It looked fine on the surface—until we flipped it over. The laser had only gone about 1mm deep, and the edges were charred black. The demo failed, the client walked, and I learned a $3,200 lesson about checking the wavelength before promising anything.

Slate engraving: possible, but with a different look

Fiber lasers can ablate slate to create a dark, textured engraving. It's durable and has a contemporary feel, but it won't be white like a CO2 result. If you need both white slate engraving and metal marking, keep a CO2 machine around or plan for a hybrid setup.

Laser engraver accessories that are worth it

Accessories are where small shops get burned. You don't need every attachment; you need the ones that prevent the mistakes I've made.

• Air assist: Non-negotiable for wood and slate. It blows away smoke and debris, reduces char, and improves cut quality.
• Honeycomb worktable: Supports thin material and reduces laser reflection marks on the underside.
• Fume extraction system: Not glamorous, but your lungs and your clients' products will thank you.
• Rotary attachment: Buy it only if you have cylinder engraving work. In 2020, I bought one before our first cylindrical order arrived (ugh). It sat in the box for nine months.

And here's a small-business note, because I've been the small customer and I know what it feels like: when I was starting out, the vendors who treated my $200 accessory orders seriously are the ones I still order from for $20,000 projects. Small doesn't mean unimportant—it means potential.

How to tell which scenario you're in

If you're not sure which category you belong to, here's the checklist I now use. We've caught 47 potential mistakes with this checklist in the past 18 months, and I regret not writing it earlier.

1. Find the wavelength label. It's usually printed on the back panel or in the system settings: 1064nm means fiber, 10.6 micrometers means CO2, and 450nm or 455nm means diode.
2. Test on scrap before production. Not on the good material. Not on the client's material. Use a scrap piece and run a quick grid test.
3. Check your air assist settings. If you're engraving slate or cutting wood, airflow is not optional. In 2021, I once skipped this check and wound up redoing a whole batch of slate coasters (note to self: air assist goes on before the laser starts, not after a smoke alarm).
4. If you need both wood cutting and metal marking, plan for two systems. It's not a failure to admit that one laser doesn't do everything. It's physics.

The short version

Can you laser cut wood? With a CO2 laser, yes. With a diode laser, sometimes—if the wood is thin and you have patience. With a fiber laser, even an IPG Photonics fiber laser, no.

Can you laser engrave slate? Yes, with all three, but the contrast is different. CO2 gives white, diode gives gray, fiber gives a dark abrasive mark. Choose based on the look your client wants.

My experience is based on roughly 400 laser setup evaluations across diode, CO2, and fiber systems. If you're working with a 5W diode or a 6kW fiber system, your results will be different. Test, document, and find a supplier who treats your small order like it matters.