Can a MOPA replace a UV laser?

No. MOPA remains a near-infrared fiber source with a wide range of pulse adjustment. A UV laser is considered when interaction with a surface, coating or sensitive material is a determining factor.

Which laser should I choose for a DataMatrix on stainless steel, aluminum or plastic?

The material alone is not enough. Finish, available area, encoded data, reading method, throughput and acceptance criteria are considered together during a test on the part.

Is CO₂ suitable for glass, Plexiglas and metal?

CO₂ may be an option for some glass, PMMA and organic materials. For metal, it is generally not the first approach for conventional direct marking.

NWS LASER RESOURCES · GUIDE · INDUSTRIAL MARKING

Choose the source,
qualify the part.

Fiber, MOPA, UV or CO₂: the source is not a catalog verdict. Material, finish, expected result, throughput and reading inspection must be studied as one process.

Compare sources

TECHNICAL GUIDELINES 4families to consider

FIBER 1064 nmUV 355 nmCO₂ 10,6 µm

PART TEST REQUIRED

STARTING POINT

The part first,
the source second.

A mark may look convincing and yet fail to meet production needs. The material, its surface condition, the expected result, throughput and reading or inspection conditions define the study. The beam, optics, parameters, fixture, extraction and reading form one process to be qualified.

FOUR GUIDELINES

Understand the
sources to consider.

The right choice is not about naming a “best laser.” It is about defining the useful interaction with a real part and the result to be achieved.

Conceptual illustration of four laser beams interacting with a metal part

Near-infrared fiber

Often considered for metals and some plastics. Depending on the part and parameters, the result may involve a surface modification, annealing, ablation or engraving.

See IK-SERIES integration

MOPA fiber

A near-infrared source offering greater flexibility in pulse settings. Contrast, fineness, behavior of a plastic or code density still need to be qualified on the part.

Understanding MOPA 1064 nm

UV 355 nm

Worth considering when fineness, interaction with a surface layer or control of thermal impact is critical. No surface-integrity result should be assumed without testing.

Explore UV 355 nm

CO₂ 10,6 µm

An option for organic materials and some polymers, as well as cardboard, rubber, leather, wood, PMMA or certain types of glass, depending on the desired effect.

Describe my material

ON THE PART

Choose based on the material
and its surface condition.

SituationKey questionsOptions to qualifyInspection requiredProject

Bare metal or alloyContrast, depth, appearance, functional areaFiber or MOPA depending on the resultAppearance, integrity, possible readabilityStudy on a representative batch

Anodized, passivated or coated aluminumMust the layer remain intact?UV and other processes to qualifyLayer integrity, contrastDefine application-specific criteria
Preserving the layer on anodized aluminum

Engineering plasticsPolymer, fillers, pigments, finishFiber, MOPA, UV or CO₂Appearance, deformation, readabilityValidation on the actual grade

Glass and transparent materialsFragility, appearance and work areaCO₂ or UV depending on the materialAppearance, integrity, resistanceControlled test

Organic materialsBrowning, precision, emissionsCO₂ to investigate firstEdge quality and extractionComplete process

Materials with the same name can react differently depending on their grade, treatment or batch. This table provides a starting point for the study; it does not replace testing or a configuration recommendation.

EXPECTED RESULT

Define the effect,
not just the machine.

Contrast, depth, roughness, color change, code readability and throughput are distinct objectives. Defining them clearly avoids comparing processes on the wrong basis.

Contrast and depth

Black marking on metal, deep engraving or local ablation are not set up in the same way. The end use—cleaning, abrasion, temperature, corrosion or sterilization—completes the specification.

DataMatrix and miniature text

A code is not validated just because it looks like a code. The area, encoded data, module size, contrast, optics, lighting and reading method must be defined together.

See DataMatrix marking

Throughput and integration

Positioning, access, height variation, conveying, robotization, inspection and handling of nonconforming parts can affect the selected solution. The complete cycle matters as much as the beam-on time.

APPLICATION EXAMPLES

The result must be judged
in context.

The photos illustrate marking situations. They do not constitute either a recipe for settings or a guarantee of results on another part.

Laser-engraved DataMatrix code on a metal part — DataMatrix engraved on a metal part — readability and contrast must be checked under real-world conditions.

Miniature laser marking on a zipper pull spring — Small part: geometry, optics and fixturing become decisive.

Electronic component marked with a fiber laser — Component: the result must remain consistent with the function of the part.

INDICATIVE COMPARISON

Fiber, MOPA, UV
or CO₂?

SourceWavelengthInteraction to be qualifiedAreas to investigateValidation essential

Near-infrared fiberApproximately 1,06 µmSurface modification depending on the part and parametersMetals, alloys, some plasticsAppearance, integrity, cycle and readability

MOPA fiberApproximately 1,06 µmWider pulse adjustment range at a comparable wavelengthContrast, dense codes, metals and some plasticsComparative test on the actual finish

UV355 nmSurface interaction to be carefully qualifiedCoatings, polymers, fine marking, micro-codesLayer integrity, precision and use

CO₂Approximately 10,6 µmInteraction with certain organic materials and polymersCardboard, paper, wood, rubber, leather, PMMA, some glassAppearance, emissions and material behavior

Wavelengths are technical reference points. They are not enough to infer the quality, depth, speed or durability of a result on a given part.

VALIDATE THE PROCESS

Before finalizing
the source.

A representative sample helps link the material, finish, geometry, desired appearance and production cycle to a genuinely workable solution.

Test on a representative batch

The test should match the material, finish, geometry, available area and usage constraints as closely as possible. For a code, the intended reading method should be included in the test.

Check the result that matters

Appearance, dimensions, readability, coating integrity, resistance to the environment or another quality criterion must be defined by the project before selecting the process.

Include extraction and safety

The material and process may generate fumes, particles or residue. Source extraction, filtration, an enclosure and safety are part of the solution.

Understand fumes and particles

FREQUENTLY ASKED QUESTIONS

Before choosing
a laser source.

Can a MOPA replace a UV laser?: No. MOPA remains a near-infrared fiber source with a wide range of pulse adjustment. A UV laser is considered when interaction with a surface, coating or sensitive material is a determining factor.
Which laser should I choose for a DataMatrix on stainless steel, aluminum or plastic?: The material alone is not enough. Finish, available area, encoded data, reading method, throughput and acceptance criteria are considered together during a test on the part.
Can an anodized part be marked without damaging its coating?: This is something to qualify, not a general promise. The type of anodizing, layer, part, desired effect and expected level of integrity must be validated by the project.
Is CO₂ suitable for glass, Plexiglas and metal?: CO₂ may be an option for some glass, PMMA and organic materials. For metal, it is generally not the first approach for conventional direct marking.
What should I send to prepare a test?: A representative part, the material and finish designation, the requested graphic or code, the available area, throughput and readability or inspection criteria make it possible to prepare a useful initial study.

APPLICATION STUDY

Send us your part so we can qualify the process directly on it.

Specify the material or grade, finish, requested graphic or code, available area, throughput and acceptance criteria. NWS Laser will recommend a process direction rather than make a catalog promise.

Choose the source,
qualify the part.

The part first,
the source second.