What all three have in common
All three technologies — diode, CO2, and fiber — cut or engrave by focusing a beam of light so precisely that it vaporizes or marks material at the point of contact. All of them require software to send your design to the machine. And all of them require safety glasses rated for their specific wavelength — the wavelengths differ between types, so the glasses are not interchangeable.
Never use diode laser glasses for a CO2 laser, or vice versa. The wrong glasses are the same as no glasses at all.
Diode Laser
A diode laser uses semiconductor laser diodes — the same basic technology as a powerful laser pointer, scaled up — to emit a focused beam of blue light at around 450nm wavelength. Simple, solid-state, and usually open-frame.
Good for
- ✓ Wood engraving & cutting (ideal for 3–10mm; 20W+ diodes can push thicker)
- ✓ Leather engraving
- ✓ Cork & fabric
- ✓ Anodized aluminum
- ✓ Dark-colored surfaces
- ✓ Direct engraving on stainless steel (20W+ diodes, slow speeds)
Not good for
- ✗ Clear, white, or light-blue acrylic (wavelength passes straight through)
- ✗ Bare reflective metals (aluminum, brass, copper)
- ✗ Glass without marking paste
Best for hobbyists and beginners who want to work with wood and leather without spending a lot. The open-frame design means you need good laser safety glasses (rated for 450nm) whenever the machine is running.
CO2 Laser
A CO2 laser uses a sealed glass tube filled with CO2 gas. An electrical discharge excites the gas molecules, which emit infrared light at 10,600nm — completely invisible to the human eye. This wavelength is absorbed by organic and non-metallic materials extremely well, which is what makes CO2 so versatile.
Good for
- ✓ Wood — both cutting and engraving
- ✓ Acrylic (clear AND colored — CO2's sweet spot)
- ✓ Leather & fabric
- ✓ Paper, cardboard, rubber, cork
- ✓ Glass surface engraving
- ✓ Stone surface marking
Not good for
- ✗ Bare metals (beam reflects off most metals)
- ✗ Cutting glass (the beam passes through it)
Best for makers who want to cut thicker material, work seriously with acrylic, or run small production quantities. Most CO2 machines are enclosed, which makes them safer and more practical for regular use. The glass tube will eventually need replacing — factor that into the long-term cost.
Fiber Laser
A fiber laser is a solid-state laser that uses a ytterbium-doped fiber optic cable as the gain medium. It emits near-infrared light at 1,064nm. This wavelength is absorbed by metals very efficiently and barely absorbed by organic materials — the opposite of CO2.
Good for
- ✓ Metals: stainless steel, aluminum, brass, copper, gold, silver, titanium
- ✓ Anodized aluminum
- ✓ Coated metals
- ✓ Hard plastics (ventilate well — some plastics emit toxic fumes)
- ✓ Color marking on stainless steel (MOPA fiber variant)
Not good for
- ✗ Wood — organic materials barely absorb this wavelength
- ✗ Leather & fabric
- ✗ Clear acrylic
Best for jewelry makers, personalized metal gifts (knives, dog tags, flasks), and industrial marking. The most precise of the three types, and essentially maintenance-free over its lifetime. While Fiber lasers are masters of engraving, hobbyist models are limited to cutting only very thin metal foils or sheets (up to 1mm). The xTool F1 is one of the more accessible desktop options for getting started with fiber.
Quick comparison
| Feature | Diode | CO2 | Fiber |
|---|---|---|---|
| Wavelength | ~450nm | 10,600nm | 1,064nm |
| Typical power | 5–40W+ optical | 40–150W | 20–50W |
| Cuts wood | ✓ Ideal 3–10mm (thicker with 20W+) | ✓ Yes (thicker) | ✗ No |
| Cuts acrylic | ✗ Not clear/white/light-blue | ✓ Yes — best option | ✗ No |
| Marks metal | Spray coating (or 20W+ for stainless) | ✗ Not bare metal | ✓ Yes — purpose-built |
| Price range | $200–$600 | $400–$4,000+ | $1,500–$5,000+ |
| Maintenance | Minimal | Tube replacement eventually | Very low — 50k hr lifespan |
| Best for | Wood, leather, beginners | Acrylic, thick cuts, production | Metals, jewelry, marking |
⚠️ Price ranges are indicative only. Laser prices change frequently — models get updated, discounts appear, and new options enter the market. Always check current listings before buying.
Which one should I pick?
I want to engrave wood, leather, and gift items on a budget. I'm just starting out and I don't need to cut thick material or work with metal right now.
I want to cut thick material, work with acrylic, and do more serious production runs. I'm willing to spend more for a machine that handles a wider range of jobs.
I want to mark metal — jewelry, knives, dog tags, industrial parts. Metal is my primary material and I need reliable, precise results.
The Metal Cutting Reality Check
One of the most common misconceptions online — videos of lasers melting through steel create unrealistic expectations. Here's what hobbyist machines actually do with metal:
| Laser Type | Can it Mark Metal? | Can it Cut Metal? | Reality Check |
|---|---|---|---|
| Diode (10W–40W) | Yes (with spray or 20W+) | ✗ NO | Will not even scratch the surface of thick metal. |
| CO2 (40W–150W) | Yes (with marking spray) | ✗ NO | Excellent for wood & acrylic, but reflects off bare metal. |
| Fiber (20W–100W) | ✓ YES — Direct & Deep | Foil only | Perfect for jewelry and tags. Cuts up to ~1mm of soft metals. |
| Industrial Fiber (1000W+) | ✓ Yes | ✓ YES | These machines cost $20,000+. Not what you're shopping for. |
🧈 No hobbyist laser cuts metal "like butter." Those viral videos are almost always industrial fiber lasers — a completely different category. If cutting metal is your goal, a desktop fiber laser will handle thin foils and sheets up to ~1mm. Anything thicker requires industrial equipment.