Laser Marking Machine, Fiber Laser, CO₂ Laser, UV Laser, Buying Guide

When a buyer contacts DiHoou Laser, the first question is rarely about price.

It is usually this one: which type of laser marking machine should I buy?

That is the right question to start with. Fiber, CO2 and UV are not better or worse than each other. They interact with materials differently, and that difference is the whole story. Choose the wrong wavelength and even a high power machine will give you burnt plastic, a mark that rubs off, or cracked glass.

So here is the order we walk through with buyers, and the questions we ask before we quote anything.

Start with the material, not the wattage

Almost every bad purchase starts with a power question. Someone asks whether to take 20W or 50W before checking whether their laser can interact with the material at all.

Lasers do not mark because they are powerful. They mark because they are absorbed. If your material reflects the beam or passes it straight through, nothing happens, no matter what the power rating says on the front of the cabinet.

There are three wavelengths sold for industrial marking, and the rule is straightforward.

• Metal and most coated metals: fiber, 1064 nm

• Wood, leather, paper, acrylic, cardboard, glass surface: CO2, 10.6 microns

• Heat sensitive plastic, glass, ceramic, PCB, medical parts: UV, 355 nm

Power comes later, and it matters far less than most buyers expect. The wavelength decides whether marking works at all. The wattage only decides how fast it works.

Everything else you will be quoted, the enclosure, the software, the rotary axis, is a configuration choice sitting on top of that one decision. Get the wavelength right and the rest is arithmetic.

Fiber laser marking machine: the metal workhorse

Fiber runs at 1064 nm, and metals absorb that wavelength well. The beam heats the surface, oxidizes or vaporizes a thin layer of it, and leaves a permanent mark.

It handles stainless steel, carbon steel, aluminum, brass, copper, titanium, gold, silver, anodized aluminum and most coated metals, plus a few engineering plastics. Typical work is serial numbers, QR and DataMatrix codes, logos, deep engraving and black annealing on stainless.

This is the machine to buy if your factory marks metal parts all day. Source life is long, there is nothing to refill, cycle times are short, and there is essentially no maintenance beyond keeping the lens clean.

Two limits worth stating plainly. Fiber is poor on wood, and poor on glass. Both absorb 1064 nm badly, so you get scorching rather than a mark.

DiHoou Laser builds these in 20W, 30W, 50W, 60W and 100W.

CO2 laser marking machine: the non-metal specialist

CO2 runs at 10.6 microns, ten times the wavelength of fiber, and it behaves like the opposite machine. Organic materials absorb it strongly. It marks by heating, vaporizing or carbonizing the surface.

Wood, plywood, leather, rubber, cardboard, paper, acrylic, textile, glass, ceramics, painted surfaces and most consumer plastics all work well. In practice CO2 machines handle packaging date and batch codes, wooden gifts, leather branding, acrylic signage, and bottle or carton coding.

One thing surprises people here. Bare stainless or aluminum will show little or no mark, because bare metal reflects almost all of the 10.6 micron beam. CO2 will mark coated metal, painted surfaces and anodized layers, but that is a mark in the coating, not in the metal underneath, and whether it survives handling depends on the coating.

CO2 machines are cheaper to buy, which is why packaging and gift work leans on them. The trade off is the tube. A glass tube is rated in the low thousands of hours and is a consumable, and the optics need cleaning on schedule.

UV laser marking machine: cold marking for sensitive parts

UV runs at 355 nm. Rather than melting or burning the surface, it carries enough photon energy to break molecular bonds directly. Almost no heat enters the part. This is what people mean by cold marking.

It matters whenever the part is small, thin, shiny, transparent or easy to deform. Think ABS and PC plastics, white or light colored plastic, glass bottles and cosmetic packaging, ceramics, PCB and flexible circuits, silicon wafers, medical tubing and devices, and micro QR codes that have to fit on a chip.

The advantages are no yellowing, no burnt edges, very fine line widths, and a clean mark on glass without the micro cracking that thermal processes can cause.

The trade off is real. UV costs more per watt, and it is slower on metal than fiber. But in electronics, medical and premium packaging, the alternative is scrap parts, and scrap costs more than the machine.

The short answer, by material

If your answer is "all of the above," you are not choosing one machine, you are choosing two. That happens more often than people expect, and it is better to plan for it than to discover it after delivery.

Three cases that buyers get wrong

Anodized aluminum. Both fiber and UV will mark it, so which one? Fiber removes the anodized layer and gives a crisp light mark, sometimes dark, depending on the grade and thickness. UV gives a finer, more consistent result and preserves more of the surface finish. If you are marking a few logos a day on phone cases, a 20W fiber does the job at the lowest cost. If you are marking fine serial numbers or expect color consistency across batches, UV is the more repeatable choice. Both answers are correct. They just cost different amounts.

Polycarbonate and ABS. Every supplier advertises all three machines for these, which tells you nothing. In practice fiber marks them by carbonizing the surface, so you get a dark mark and a slight raised edge you can feel with a fingernail. CO2 gives a frosted, low contrast look that suits some products. UV changes the material photochemically, with no burning and no raised edge. If the mark has to pass a fingernail or rub test on a molded component, ask for a UV sample before you commit.

Glass. CO2 surface etching is the traditional process, it is cheap, and it works. UV gives you smaller characters and does not need any coating or pre-treatment, which is why it dominates in drinkware and optics. Fiber marks glass badly, or not at all. If a supplier tells you a fiber machine is fine for glass, request a sample of your exact glass before you pay a deposit.

Power: the number people get wrong in both directions

This is the most common mistake we see. Give me the biggest one, it must be better.

It is not.

Once the wavelength is settled, power is usually decided by speed requirements rather than marking capability. Almost any power level will mark. The question is how many parts per hour.

Fiber Laser Marker

• 20W: light marking and small batch work

• 30W: the sweet spot for most job shops, covers mixed production comfortably

• 50W: deep engraving, faster throughput, or thicker coatings to remove

• 60W to 100W: heavy batch work, or engraving measured in millimeters

CO2 Laser Marker

• 30W to 40W: enough for date and lot coding on film, labels and cartons

• 60W and up: for depth, and for cutting rather than just marking

UV Laser Marker

• 3W: fine marking on plastics, PCB and glass

• 5W: the flexible middle, and what most customers settle on

• 10W and above: throughput on ceramics, sapphire and heavier production

Two things worth knowing. On fiber, the jump from 20W to 30W costs very little and buys a real speed increase, while the jump from 50W to 100W costs a great deal and only pays back if your volume justifies it. Know which side of that line your work sits on. On UV, higher power also means more heat, so past a certain point you are trading away the low heat advantage that made you choose UV in the first place.

What actually decides the specification is six things:

1. The material, and whether it is coated, plated or anodized

2. What the mark has to look like: black, white, frosted, deep, permanent or removable

3. The marking area you need, and whether the part is flat or curved

4. How the part is held: flat bed, rotary axis, or flying marking on a conveyor

5. How it integrates: encoder, sensor, vision positioning, PLC or MES

6. Total cost of ownership, which is machine price plus spares plus source life plus downtime

The details nobody thinks about until the machine is on the floor

Marking area, and what comes with it. A 100 x 100 mm lens is not the same as a 300 x 300 mm lens in any respect except the marking area. Longer focal length means a bigger spot, a deeper usable depth of field, and slightly less fine detail. If you plan to mark curved or uneven parts, depth of field matters more than area. Tell your supplier what the part actually looks like, not just how big it is.

How the part gets held. Flat sheet is easy. Cylinders need a rotary axis. Rings, tubes and small hardware usually need a custom fixture. Ask about it at quotation stage, because retrofitting a rotary axis later is more expensive than ordering it with the machine.

Fume extraction. Marking wood, leather, coated metal and PVC produces smoke or vapor. On PVC, this is not just a smell. The chlorine released attacks the optics, and the fumes need real extraction. This is a machine lifetime issue, not a comfort issue.

Power supply. Most industrial marking machines are built for 220V single phase, 50 Hz. If your site runs 110V/60Hz or three phase, say so at quotation. A voltage mismatch discovered on installation day is an unpleasant conversation for everyone.

Cooling. Low power fiber units are air cooled and need nothing from you. Higher power CO2 and UV units may be water cooled, which means a chiller and somewhere to put it.

Enclosure and safety class. If you are importing into the EU or the US, check the CE marking and the FDA laser class of the enclosure, and confirm you are getting Class 1 operation. A machine that requires the operator to wear goggles during every cycle is a different product from one that does not, whatever the price difference suggests.

Software and file formats. Confirm it opens what your designers actually use. PLT, DXF, AI, BMP and JPG cover most workflows. If you are integrating with an ERP or a production database for variable serial numbers, raise that before the order, not after.

Running cost, without the marketing language

None of the three machines uses ink, ribbon or chemical consumables. That part of the pitch is true.

What does wear out: the laser source, the lens and the mirrors.

• Fiber sources: usually quoted around 100,000 hours

• UV sources: typically 20,000 to 30,000 hours, and more expensive to replace

• CO2 tubes: the shortest lived, with glass tubes in the low thousands of hours and RF tubes several times that

• F-theta lenses: consumable across all three, and how long one lasts depends on how much fume you let near the optics, which is another argument for proper extraction

Electricity draw is modest compared to a welding cell or a fiber laser cutter. If you want a rough comparison across five years, the fiber machine wins on cost per part in almost every scenario. That is not a reason to buy it. It is a reason to be honest with yourself about whether your material can be marked by anything else.

How we help DiHoou customers decide

When an inquiry arrives, we do not quote immediately. We ask five things first.

• What material are you marking?

• Can you send three to five sample parts?

• What should the mark look like: black, white, frosted, deep, or removable?

• How many pieces per day?

• Desktop unit, enclosed cabinet, or inline system?

Then we mark your actual sample and send you the photos. That is more reliable than reading any specification table, ours included. It is the only way to know how your specific alloy, your specific plastic and your specific coating will behave.

Five questions worth asking any supplier, including us

1. Can you test my actual samples? Not a similar material. Mine, the one I will run every day.

2. What source brand is in the machine, and what are the spare part lead times? A great deal at purchase and a long wait in year three is a bad trade.

3. What is the marking area, and what is the spot size and depth of field at that configuration? A supplier who can answer this in numbers understands the product.

4. What is covered in year two and year three, and who pays for shipping on a warranty repair?

5. What arrives in the crate, and who handles installation and training? A supplier who answers all five in specifics is probably fine to work with. A supplier who answers in adjectives is not.

What we would actually recommend

For a job shop starting out with mixed metal work, a 30W fiber laser marking machine is the safest single purchase. It covers most metals, needs no water, no maintenance and no consumables, and 30W is enough for deep engraving on most jobs if you slow the speed down.

If your work is wood, leather, acrylic or packaging coding, ignore fiber entirely and take the CO2 machine. You will save money at purchase and mark faster every day.

Take UV only when the part genuinely cannot take heat, or when you need detail that the other two physically cannot reach. It is the most expensive per watt, and buying it as insurance against every possible future job is how people end up with an underused machine.

And if you are unlucky enough to need two wavelengths, buy the one that runs the higher volume first.

Not sure which one fits your parts?

Send us a few samples. We will mark them on the relevant machines and tell you which is the cheapest way to get the result you want, including when the answer is not the most expensive machine on the page.

Shenzhen DiHoou Laser Technology Co., Ltd

Email: info@dihooulaser.com

WhatsApp: +86 13528427957