Laser cutters and engravers are often advertised by wattage: 5W, 10W, 20W, 40W, 60W, 80W, 100W, and beyond. It is tempting to think “more watts equals better laser,” but laser power is only part of the story. The type of laser, the wavelength of light it produces, the material being processed, the lens, the speed, the air assist, the focus, and the machine’s motion system all affect what the laser can actually do.

For makers, artists, small businesses, and fabrication labs, understanding laser power helps answer three practical questions:

What materials can I cut?

What materials can I engrave?

How fast, clean, and safely can I do the work?

What Is Laser Power?

Laser power is usually measured in watts. In a maker context, wattage tells you how much optical energy the laser can deliver to the material. Higher wattage generally means the laser can remove, burn, melt, vaporize, or mark material faster. It can also allow deeper cuts or fewer passes.

But wattage alone does not determine capability. A 20W diode laser, a 20W fiber laser, and a 20W CO₂ laser behave very differently because they produce different wavelengths of light. Materials absorb some wavelengths well and reflect or transmit others. That is why one laser may cut wood beautifully but barely mark bare metal, while another laser marks stainless steel easily but is not the right choice for cutting plywood.

The Big Idea: Power + Wavelength + Material

Every laser-material interaction comes down to absorption. If the material absorbs the laser’s wavelength efficiently, the laser can cut, engrave, or mark it effectively. If the material reflects the wavelength or allows it to pass through, the same wattage may do very little.

That is why clear acrylic cuts beautifully on many CO₂ lasers but performs poorly on many blue diode lasers. It is also why fiber lasers are excellent for metal marking, while CO₂ lasers are common for wood, leather, acrylic, paper, cardboard, and many organic materials.

Common Maker Laser Types

Diode Lasers

Typical maker wattages: 5W, 10W, 20W, 40W+

Common wavelength: around 445–455 nm blue light

Best for: wood engraving, cardboard, paper, leather, painted surfaces, coated tumblers, anodized aluminum, dark acrylic, craft materials

Less ideal for: clear acrylic, glass, bare metal cutting, thick materials, production-speed cutting

Diode lasers are popular entry-level and desktop maker lasers because they are relatively affordable, compact, and easy to maintain. They are often sold as open-frame machines or enclosed desktop units. A 5W diode can engrave many surfaces and cut thin paper, cardboard, and very thin wood. A 10W or 20W diode can cut thin plywood, basswood, leather, and some dark acrylic. Higher-powered diode systems can do more, but they still behave differently from CO₂ lasers because the blue wavelength interacts differently with transparent and light-colored materials.

A diode laser is a great choice for learning laser basics, making signs, engraving wood, cutting small craft parts, and customizing coated items. It is not usually the best choice if your main goal is clean acrylic cutting or high-volume production.

CO₂ Gas Lasers

Typical maker wattages: 40W, 55W, 60W, 80W, 100W+

Common wavelength: 10.6 microns

Best for: wood, acrylic, leather, paper, cardboard, cork, rubber stamps, fabric, glass engraving, stone marking, coated materials

Less ideal for: bare metal cutting or engraving without special coatings, reflective metals, some plastics

CO₂ lasers are one of the most common laser types in makerspaces, sign shops, schools, and small fabrication businesses. These machines use a gas-filled laser tube, usually sealed, to generate infrared laser light. People sometimes refer to these as “gas lasers” or “compressed gas lasers,” although in most maker machines the gas tube is sealed rather than something the operator fills or compresses during normal use.

CO₂ lasers are especially useful because many organic materials absorb their wavelength well. They are excellent for cutting acrylic, engraving wood, cutting paper products, engraving leather, cutting fabric, and making signage, displays, awards, packaging, templates, and decorative objects.

A 40W CO₂ laser can handle many engraving jobs and thin cuts. A 55W to 60W CO₂ laser is a strong general-purpose maker machine. An 80W CO₂ laser offers faster cutting and better capability on thicker materials. A 100W+ CO₂ laser begins to move into heavier production and thicker material cutting, although material quality, lens choice, and machine rigidity still matter.

Fiber Lasers

Typical maker wattages: 20W, 30W, 50W, 60W, 100W+

Common wavelength: around 1064 nm

Best for: stainless steel, aluminum, brass, copper, titanium, anodized aluminum, metal tools, jewelry, tags, industrial plates, some plastics

Less ideal for: wood cutting, clear acrylic cutting, paper, cardboard, leather, large-format organic material work

Fiber lasers are the metal-marking workhorses of the maker and small manufacturing world. A fiber laser concentrates energy into a wavelength that metals absorb much better than they absorb CO₂ laser light. That makes fiber lasers excellent for engraving, annealing, etching, and marking metal.

Many desktop fiber lasers use galvo heads, which move the beam with mirrors instead of moving a gantry. This makes them extremely fast for small-format engraving. They are commonly used for jewelry, coins, tumblers, serial numbers, QR codes, tools, knives, firearms parts where legally appropriate, pet tags, machine plates, and promotional products.

A 20W fiber laser can mark many metals. A 30W or 50W fiber laser gives more speed and depth. A 60W MOPA fiber laser gives more control over pulse settings, which can help with color marking on some metals, deeper engraving, and more refined results on certain materials. Industrial fiber cutters used for sheet metal are usually far more powerful than desktop fiber engravers, often hundreds or thousands of watts.

MOPA Fiber Lasers

Typical maker wattages: 30W, 60W, 100W

Best for: advanced metal marking, stainless color effects, anodized aluminum, deep engraving, fine control over pulse behavior

MOPA stands for Master Oscillator Power Amplifier. In plain language, MOPA fiber lasers give the operator more control over pulse duration and marking behavior than many standard fiber lasers. This matters when you want different effects on metal: black marks, white marks, polished engraving, deep engraving, or color-like oxide effects on stainless steel.

A MOPA laser is not automatically “better” for every job, but it is more flexible for advanced metal work.

UV Lasers

Typical maker wattages: 3W, 5W, 10W+

Common wavelength: 355 nm

Best for: plastics, glass, coated materials, electronics, delicate markings, heat-sensitive materials, fine-detail engraving

Less ideal for: thick cutting, fast wood cutting, heavy material removal

UV lasers are less common in hobby shops but increasingly useful for small business engraving and specialty marking. They use a shorter wavelength that can create very fine, high-contrast marks with less heat damage. This is sometimes called “cold marking,” although there is still energy involved.

UV lasers are useful for plastics, glass, ceramics, circuit boards, packaging, electronics, and items that might melt, char, or deform under a CO₂ or diode laser. A 5W UV laser may not sound powerful compared with an 80W CO₂ laser, but because the wavelength interacts differently with materials, it can produce marks that other lasers cannot.

What Different Wattages Usually Mean

3W–5W

This is common for small diode lasers and UV lasers. In diode machines, this power range is good for light engraving, paper, cardboard, thin craft materials, and learning. In UV machines, 3W–5W can be very useful for precise marking on plastics, glass, and coated materials.

Best uses: fine engraving, small crafts, learning, delicate marking.

10W

A 10W diode laser is a capable beginner-to-intermediate machine. It can engrave wood well and cut thin materials with the right settings. A 10W UV laser, meanwhile, is a specialty marking tool rather than a wood-cutting machine.

Best uses: wood engraving, thin plywood, leather, paper, coated items, small-batch products.

20W

A 20W diode laser is a strong desktop craft laser. It can cut thin wood more reliably than lower-power diodes and engrave faster. A 20W fiber laser is a basic but useful metal marking machine.

Best uses: craft production, coated tumblers, signs, wood projects, tags, basic metal marking if fiber.

30W–40W

This is a transition range. A 40W CO₂ laser is a classic entry-level laser cutter. It can cut acrylic, wood, leather, cardboard, and many common shop materials. A 30W fiber laser is a more capable metal engraver than a 20W fiber and can usually work faster or deeper.

Best uses: small fabrication, acrylic signs, wood cutting, product engraving, metal tags if fiber.

50W–60W

This is a strong maker and small-business range. A 55W or 60W CO₂ laser is excellent for general-purpose cutting and engraving. A 50W or 60W fiber laser is a powerful metal-marking system, especially useful for production engraving and deeper work.

Best uses: small business products, production engraving, thicker acrylic or wood, faster job turnaround.

80W–100W

This range is common in prosumer and professional CO₂ laser cutters. These machines can cut faster and handle thicker materials more comfortably than 40W or 60W machines. They are useful for signage, furniture components, layered art, packaging, templates, displays, and batch production.

Best uses: production cutting, thicker acrylic, thicker plywood, signage, larger-format fabrication.

100W+

At this level, machines become more specialized. CO₂ lasers above 100W can cut thicker materials and run faster, but they require more attention to ventilation, fire safety, optics, alignment, and material testing. Fiber lasers above 100W can do deeper and faster metal work, but desktop machines are still usually engravers rather than true sheet-metal cutters unless designed specifically for cutting.

Best uses: production shops, thicker materials, deep engraving, industrial workflows.

Cutting vs. Scoring vs. Engraving

Laser work is not just one process. The same machine can produce very different results depending on power, speed, focus, and number of passes.

Cutting

Cutting means the laser goes all the way through the material. Cutting usually requires higher power, slower speed, good focus, and often air assist. Materials like wood, acrylic, cardboard, paper, leather, and fabric are common cutting materials. Metal cutting usually requires specialized equipment and much higher power than typical desktop lasers.

Scoring

Scoring means the laser creates a shallow line without cutting all the way through. This is useful for fold lines, layout marks, decorative outlines, alignment guides, and details that need to be visible but not separated. Scoring usually uses lower power or faster speed than cutting.

Engraving

Engraving removes or changes the surface of the material to create text, graphics, photos, textures, or patterns. Raster engraving works like a printer, moving back and forth line by line. Vector engraving follows paths. Engraving can be shallow and decorative or deeper and more tactile depending on the material and settings.

Marking

Marking changes the surface appearance without necessarily removing much material. Fiber and UV lasers are often used for marking metal, plastic, glass, and coated materials. Annealing stainless steel, for example, can create a dark mark without cutting into the surface.

How Power Affects Material Choices

Wood

Wood is one of the most common laser materials. Diode and CO₂ lasers both work well on wood, but CO₂ lasers are generally faster and better for cutting. Higher power allows thicker cuts and faster production, but too much power can cause burning, charring, or wide kerf lines. Plywood quality matters a lot because glue layers and voids can affect results.

Best laser types: CO₂, diode
Common processes: cutting, engraving, scoring
Watch out for: smoke, resin, glue, flame, inconsistent plywood cores

Acrylic

Acrylic is a favorite CO₂ laser material. CO₂ lasers can produce smooth, polished edges on acrylic. Clear acrylic is much better suited to CO₂ lasers than blue diode lasers because clear acrylic does not absorb blue diode light well. Dark acrylic may work on some diode lasers.

Best laser types: CO₂
Common processes: cutting, engraving, edge-lit signs, awards
Watch out for: cast vs. extruded acrylic differences, fumes, flame, melting

Leather

Leather can engrave and cut well, especially with CO₂ lasers and some diode lasers. It is important to use real, laser-safe leather and avoid unknown synthetic materials that may contain PVC or other hazardous compounds.

Best laser types: CO₂, diode
Common processes: engraving, cutting, branding, patches
Watch out for: smell, smoke, chrome-tanned leather, unknown synthetic leather

Paper and Cardboard

Paper and cardboard cut easily, often with relatively low power. The challenge is avoiding fire and scorch marks. Fast speeds, lower power, air assist, and careful supervision are important.

Best laser types: CO₂, diode
Common processes: cutting, scoring, packaging prototypes, stencils
Watch out for: fire risk, soot, warping, honeycomb marks

Glass

CO₂ and UV lasers can mark glass, but they do not “cut” glass in the normal maker sense. CO₂ lasers create a frosted surface effect. UV lasers can make fine marks with less thermal stress. Rotary attachments allow engraving on cups, bottles, and mugs.

Best laser types: CO₂, UV
Common processes: engraving, marking
Watch out for: cracking, uneven glass, coatings, cylindrical alignment

Metal

Bare metal is where fiber lasers shine. CO₂ and diode lasers can mark coated metals, anodized aluminum, painted tumblers, or metal treated with marking spray, but fiber lasers are the correct tool for direct metal marking and engraving.

Best laser types: fiber, MOPA fiber, UV for some applications
Common processes: marking, annealing, engraving, deep engraving
Watch out for: reflections, heat buildup, focus, metal type, safety enclosure

Plastics

Plastics vary widely. Some engrave beautifully. Some melt. Some release dangerous fumes. Some should never be placed in a laser. PVC and vinyl are especially dangerous because they can produce corrosive and toxic gases that harm people and destroy equipment.

Best laser types: depends on plastic; CO₂, UV, and fiber can all be useful
Common processes: marking, engraving, cutting selected plastics
Watch out for: PVC, vinyl, unknown plastics, melting, toxic fumes

Why More Power Is Not Always Better

A more powerful laser can cut faster and deeper, but it can also create problems. Too much power can burn wood, melt acrylic, warp thin materials, widen the kerf, reduce fine detail, or create more smoke and flame. For engraving, lower power and higher speed often produce cleaner detail.

The best laser is not always the highest-watt laser. The best laser is the one matched to the material, the project, the desired finish, and the production volume.

For example:

A 5W UV laser may mark plastic better than an 80W CO₂ laser.

A 20W fiber laser may mark stainless steel better than a 100W CO₂ laser.

A 60W CO₂ laser may cut acrylic better than a 40W diode laser.

A 10W diode laser may be perfectly adequate for wood ornaments, signs, and small gifts.

Safety Matters at Every Power Level

Even small lasers can permanently damage eyes, start fires, and produce hazardous fumes. Enclosures, interlocks, ventilation, filtration, fire monitoring, air assist, correct eyewear, and material verification are essential.

Never assume a material is safe just because it fits in the machine. Avoid PVC, vinyl, unknown plastics, reflective materials not approved for your machine, and anything with mystery coatings or adhesives. When in doubt, verify the material before cutting or engraving.

Choosing the Right Laser for Your Projects

Choose a diode laser if you want an affordable way to engrave wood, cut thin craft materials, customize coated items, and learn laser basics.

Choose a CO₂ laser if you want the most versatile general-purpose maker laser for wood, acrylic, leather, paper, cardboard, fabric, signage, displays, awards, and product prototyping.

Choose a fiber laser if your main work is metal marking, metal engraving, tools, jewelry, serial numbers, tags, coins, tumblers, and industrial-style products.

Choose a MOPA fiber laser if you want more advanced control for metal effects, stainless color marking, anodized aluminum, and deeper or more refined metal engraving.

Choose a UV laser if you need fine, high-contrast marking on plastics, glass, electronics, packaging, or heat-sensitive materials.

Final Takeaway

Laser power matters, but it is not the whole story. Wattage tells you how much energy the laser can deliver, while laser type and wavelength determine how that energy interacts with the material. A good laser workflow starts with the material, then chooses the right laser type, wattage, lens, speed, focus, air assist, and safety setup.

For makers, the most useful question is not “How powerful is the laser?” It is “What material do I want to work with, and what result do I want: cutting, scoring, engraving, or marking?”

Once you understand that, laser power becomes a tool—not a mystery.

Learn More About Laser Power and Laser Types

Epilog Laser: CO₂ and Fiber Laser Wavelengths
https://www.epiloglaser.com/how-it-works/faq/laser-source-wavelengths/

Trotec Laser: Diode vs. CO₂ vs. Fiber Laser Comparison
https://www.troteclaser.com/en-us/resources/blog/diode-laser-vs-co2-laser-vs-fiber-laser-the-comparison-guide

xTool: 20W 455 nm Diode Laser Module Example
https://asia.xtool.com/en-ph/products/xtool-m2-20w-455nm-diode-laser-module

Epilog Laser: Acrylic Laser Cutting and Engraving
https://www.epiloglaser.com/how-it-works/applications/laser-cutting-acrylic/

OSHA: Laser Hazards
https://www.osha.gov/laser-hazards/standards

OSHA Technical Manual: Laser Health Hazards and Ventilation
https://www.osha.gov/otm/section-3-health-hazards/chapter-6

Stanford Environmental Health & Safety: Laser Cutter Safety Guidance
https://ehs.stanford.edu/wp-content/uploads/Laser-Cutters-Safety-Guidance.pdf