Quick Answer: Which Fiber Laser Should You Choose for Metal?

For standard metal marking, a 20W or 30W pulsed fiber laser is often enough for logos, serial numbers, QR codes, DataMatrix codes, basic text and surface marking. If you need faster production, deeper engraving or a larger amount of material removal, moving to 50W or 100W can make more sense.

If the application requires special effects such as black marking on stainless steel, high-contrast marking on anodized aluminum, controlled color marking or processing where heat input must be carefully controlled, a MOPA fiber laser is usually worth testing.

1. Stainless Steel Laser Marking Compatibility

Stainless steel is probably the most common metal I would expect a general-purpose fiber laser marking machine to process. It is widely used for industrial equipment, kitchen appliances, tools, medical components, automotive parts, nameplates and consumer products.

A 1064nm pulsed fiber laser is generally a strong starting point for stainless steel. Depending on the process window, you can create surface contrast, oxide-based color effects, or remove material to create an engraved mark.

Typical Applications

• Serial numbers
• QR codes and DataMatrix codes
• Company logos
• Tool identification
• Medical component identification
• Automotive components
• Stainless steel nameplates
• Kitchen appliance identification
• Industrial equipment marking

Recommended Machine Selection

2. Carbon Steel Laser Marking

Carbon steel is generally straightforward for a pulsed fiber laser. Typical applications include tools, mechanical components, shafts, machine parts, automotive components and industrial hardware.

Where Fiber Laser Works Well

• Part numbers
• Serial numbers
• Logos
• QR codes
• Deep engraving
• Identification marks
• Tool marking
• Industrial traceability

For simple identification, 20W or 30W is normally the first configuration I would test. For deeper engraving, 50W or 100W becomes more attractive because production time becomes more important than simply achieving a visible mark.

3. Aluminum Laser Marking Compatibility

Aluminum is compatible with 1064nm fiber laser marking, but it deserves more attention than ordinary steel because aluminum has different optical and thermal characteristics. The actual result can also change significantly depending on whether the aluminum is raw, anodized, painted, coated or polished.

Typical Applications

• Electronics housings
• Automotive components
• Machine nameplates
• Aluminum profiles
• Consumer electronics
• Industrial control panels
• Aluminum tools
• Product serial numbers

Raw Aluminum vs Anodized Aluminum

4. Anodized Aluminum: One of the Most Important Compatibility Cases

Anodized aluminum deserves its own section because customers often say simply “aluminum” when they actually mean anodized aluminum.

Those are not the same marking job. The anodized layer changes the optical response and the visual appearance of the final mark.

Common Applications

• Consumer electronics housings
• Mobile device components
• Industrial control panels
• Machine nameplates
• Automotive interior components
• Aluminum tools
• Electrical equipment

5. Copper Laser Marking

Copper is one of the materials where I recommend testing before making a final machine decision. The reason is simple: copper is highly reflective and has high thermal conductivity.

A standard fiber laser can process copper, but the customer’s actual requirement matters. Marking a small serial number on an electrical component is very different from removing a large area of copper or processing thick copper parts.

Typical Applications

• Copper electrical terminals
• Busbars
• Electrical connectors
• Motor components
• Transformer components
• Electrical hardware
• Industrial copper parts

Practical Selection

6. Brass Laser Marking

Brass is commonly used for hardware, valves, fittings, decorative components, electrical parts and industrial products. A pulsed fiber laser is generally a practical choice for surface identification and engraving.

Common Applications

• Brass valves
• Plumbing fittings
• Hardware components
• Decorative parts
• Electrical components
• Industrial identification
• Logos and serial numbers

For ordinary brass identification work, I would normally start with a 20W or 30W fiber laser. If the customer wants deep engraving or very high production throughput, a 50W system is worth comparing.

7. Titanium Laser Marking

Titanium can be marked with fiber lasers and is used in aerospace, medical devices, automotive components, sports products and premium hardware.

The important point is that “titanium marking” can mean several completely different things: simple identification, dark marking, surface oxidation/color effects or actual engraving.

8. Gold Laser Marking

Gold jewelry can be marked using pulsed fiber laser systems, but jewelry applications require a different mindset from industrial serial-number marking.

Typical Jewelry Applications

• Names
• Dates
• Logos
• Serial numbers
• Custom messages
• Decorative engraving
• Jewelry identification

For jewelry, the machine should not be evaluated only by maximum laser power. Fine spot quality, optical stability, rotary-axis integration, software control and the ability to produce clean small characters can be more important.

9. Silver Laser Marking

Silver is another reflective metal that can be processed with fiber laser technology. Jewelry, identification and decorative applications are common use cases.

As with copper and gold, I recommend testing the actual alloy rather than relying only on the material name. “Silver” in a real production environment may refer to different alloys, finishes or plated surfaces.

Common Applications

• Silver jewelry
• Jewelry identification
• Decorative engraving
• Custom names
• Serial numbers
• Product logos

20W vs 30W vs 50W vs 100W: How I Would Actually Choose

This is one of the questions I receive most often from overseas buyers. My answer is simple: do not start with the highest wattage; start with the production requirement.

Real Laser Source Parameters: Why the Datasheet Matters

A good buyer should look beyond the advertised wattage. Here are two real manufacturer examples that show why.

Raycus RFL-P20QB — 20W Q-Switched Fiber Laser

JPT M7 20W / 30W MOPA

These specifications do not mean that the JPT M7 will automatically produce a better mark than the Raycus source in every application. They demonstrate something more important: the laser source’s pulse characteristics can be significantly different even when the nominal power is similar.

How I Would Test a New Metal Before Buying the Machine

The following is a starting test methodology, not a guaranteed parameter recipe. Exact parameters depend on alloy, surface condition, lens, scanner, laser source, focal spot, required contrast and production speed.

1. Identify the exact material. Do not write only “stainless steel” or “aluminum”. Ask for the alloy and surface treatment whenever possible.
2. Define the required mark. Surface color, white mark, black mark, engraved depth and decorative effect are different processes.
3. Start with a matrix test. Change speed, power, frequency and hatch strategy systematically instead of randomly adjusting one parameter after another.
4. Check the actual production cycle. A beautiful mark that takes 40 seconds may be less valuable than a slightly different mark that takes 5 seconds.
5. Check barcode readability. For traceability applications, appearance is not enough. QR and DataMatrix codes need reliable machine readability.
6. Check the surface after cleaning. If the customer washes, oils, passivates, anodizes or sterilizes the product, the mark should be tested after the actual downstream process.
7. Repeat the test on multiple parts. One successful sample does not prove production stability.

Metal Laser Marking Machine Procurement Checklist

If you are purchasing a laser marking machine for metal production, I recommend sending the supplier these questions before comparing prices.

5 Common Purchasing Mistakes When Buying a Metal Laser Marker

Mistake 1: Buying by Wattage Only

“30W is 30W” is not a complete technical comparison. Laser source architecture and pulse characteristics matter.

Mistake 2: Testing Only One Material Sample

A supplier may successfully mark one stainless steel sample, but your production parts may have a different surface finish, alloy or coating.

Mistake 3: Ignoring Production Speed

The machine may produce an excellent mark but still be too slow for the production line. Always calculate marking time per piece.

Mistake 4: Confusing Marking With Engraving

A visible surface mark and deep material removal are completely different requirements. A machine that is excellent at identification marking is not automatically the best machine for deep engraving.

Mistake 5: Not Testing the Finished Product

If the part will later be cleaned, anodized, passivated, sterilized, painted or exposed to chemicals, test the marking after the actual production process.

Metal Compatibility Decision Chart

7 Practical Conclusions From a Laser Technician’s Perspective

Source Traceability and Technical Notes

The laser-source specifications in this section are based on manufacturer-published information rather than estimated marketplace specifications.

• Raycus RFL-P20QB: 20W, 1064nm, 20–60kHz, 90–110ns pulse width, maximum single pulse energy 1mJ, M² < 1.5, air cooled.
• JPT M7 20W / 30W: 1064nm, 1–4000kHz, 2–500ns pulse width, maximum pulse energy 1mJ and M² < 1.5.
• Technology reference: Pulsed fiber lasers around 1µm are widely used for metal marking, while MOPA provides greater pulse-control flexibility than conventional Q-switched architectures.

Important: The power recommendations in this article are engineering starting points for machine selection, not guaranteed marking recipes. Final parameters should be established by testing the customer’s actual alloy, surface treatment, marking size, required contrast, production speed and downstream process.

Quick Answer: Fiber vs UV vs CO₂ for Non-Metal Materials

For many plastics, especially heat-sensitive or precision components, 355nm UV laser is usually the first technology I would test. UV processing can produce high-contrast marks with lower thermal impact on suitable materials.

For wood, acrylic, leather, paper, packaging and many general non-metal products, CO₂ laser is usually the more natural starting point.

Fiber laser can also mark many plastics, especially plastics formulated with laser-sensitive additives or applications where a specific contrast mechanism is required. But I would not assume that a fiber laser will produce the same result on every plastic.

*Compatibility does not mean that every grade, color, additive, coating or formulation will produce the same result. Actual production material testing is recommended.

1. ABS Plastic Laser Marking

ABS is one of the most common engineering plastics used for housings, automotive components, electrical products and consumer products.

UV laser is particularly interesting for ABS when the customer needs a clean, high-contrast mark with limited thermal deformation. UV laser marking can interact directly with polymer bonds and produce a photochemical color transformation rather than relying only on thermal melting.

Typical ABS Applications

• Electrical housings
• Automotive interior components
• Switch panels
• Consumer electronics
• Appliance control panels
• Product serial numbers
• QR and DataMatrix codes
• Logos and product identification

2. Polycarbonate (PC) Laser Marking

Polycarbonate is widely used where impact resistance, dimensional stability and transparency are important. It appears in electronics, automotive components, industrial products, protective covers and consumer products.

Typical Applications

• Electronic housings
• Transparent or translucent components
• Automotive switches
• Control panels
• Industrial components
• Safety-related product identification

For precision identification on PC, UV is often worth testing first. The lower thermal impact can help when the customer is concerned about deformation, melting or excessive heat-affected areas.

Common Problem: The Mark Is Too Wide

When a customer wants very small characters but the mark appears wider than expected, simply reducing the laser power may not solve the problem. Focus quality, optical spot size, pulse characteristics, scanning speed, frequency and the material response all contribute.

3. PE and HDPE Laser Marking

Polyethylene is common in packaging, containers, industrial components, bottles and many everyday plastic products.

PE is a good example of why a material compatibility chart should not be treated as a guaranteed recipe. The exact polymer formulation, pigment, density and additives can change the laser response.

Applications

• Plastic containers
• Packaging products
• Industrial components
• Plastic caps
• Identification codes
• Batch information

4. Polypropylene (PP) Laser Marking

PP is frequently used in packaging, automotive parts, containers, household products and industrial components.

UV laser is often considered when the application requires fine, permanent identification and low thermal impact. CO₂ can also be appropriate for selected PP formulations.

Typical Applications

• Packaging components
• Plastic containers
• Automotive plastic components
• Household products
• Product identification
• Batch and date marking

5. PVC Laser Marking

PVC is widely used in industrial products, cables, profiles, packaging and other plastic components.

PVC deserves special attention because the formulation can vary considerably. Processing should therefore be evaluated not only from a marking-quality perspective but also from a material-safety and ventilation perspective.

Typical Applications

• PVC components
• Industrial identification
• Product labels
• Plastic profiles
• Selected cable applications

6. PEEK and Engineering Plastics

Engineering plastics such as PEEK, PA, POM and other high-performance polymers are commonly used in automotive, medical, electronics and industrial applications.

These materials are often more demanding than ordinary commodity plastics. The customer may need extremely small characters, permanent identification, traceability codes or marks that survive cleaning and chemical exposure.

Where UV Becomes Interesting

• Medical components
• Electronic components
• Precision mechanical parts
• Automotive components
• High-performance polymer parts
• Traceability marking

JQ’s published UV application information includes engineering plastics such as PEEK among the materials considered for UV processing. The final process should still be validated using the actual grade.

7. Acrylic / PMMA Laser Marking

Acrylic is one of the classic CO₂ laser materials. It is widely used for signage, displays, gifts, decorative panels and customized products.

Typical Applications

• Advertising signs
• Display panels
• Decorative products
• Customized gifts
• Industrial panels
• Product identification

For general acrylic engraving, I would normally start with a CO₂ laser. The 10.6μm wavelength is naturally suited to many organic and polymer materials.

8. Glass Laser Marking

Glass is a particularly interesting material because both CO₂ and UV lasers can be used, but the marking mechanisms and achievable results are different.

Typical Applications

• Cosmetic bottles
• Pharmaceutical containers
• Laboratory glass
• Industrial glass
• Decorative glass
• Product identification
• Graduation marks
• Traceability information

For glass, I would never promise a production result based only on the word “glass”. Glass composition, thickness, coating and the required mark all matter.

9. Wood and Bamboo Laser Marking

Wood and bamboo are classic CO₂ laser applications. The material absorbs the CO₂ wavelength efficiently enough for controlled engraving and surface modification.

Typical Applications

• Wooden gifts
• Furniture components
• Wooden boxes
• Bamboo products
• Decorative panels
• Personalized products
• Craft products
• Logos and illustrations

JQ’s published CO₂ configurations include 30W, 60W and 100W classes, while the exact useful power depends on whether the customer needs surface marking, engraving depth or production speed.

30W vs 60W vs 100W CO₂

10. Leather Laser Marking and Engraving

CO₂ laser is commonly considered for leather because it can create controlled surface engraving and color changes.

Typical Applications

• Wallets
• Bags
• Belts
• Shoes
• Leather labels
• Logos
• Names
• Decorative patterns

11. Rubber Laser Marking

Rubber is another material where the word itself does not provide enough technical information. Natural rubber, synthetic rubber, silicone and industrial rubber compounds can have very different laser responses.

Typical Applications

• Rubber seals
• Industrial components
• Gaskets
• Product identification
• Logos
• Batch numbers
• Custom rubber products

CO₂ is often a practical starting point for suitable rubber materials, but the exact formulation should always be tested.

12. Ceramic Laser Marking

Ceramic applications include electronic components, insulators, capacitors, technical ceramics and decorative products.

UV laser can be particularly attractive for precision identification because the 355nm wavelength can interact with sensitive materials while reducing the thermal footprint compared with some infrared processes.

Applications

• Ceramic capacitors
• Electronic components
• Insulators
• Technical ceramics
• Precision components
• Product identification

13. PCB Laser Marking

PCB marking is one of the applications where I would normally consider UV before a conventional fiber or CO₂ system.

Typical PCB Applications

• PCB serial numbers
• QR codes
• DataMatrix codes
• Product identification
• Traceability codes
• Manufacturing information
• Component identification

JQ’s published UV system uses 355nm technology and lists PCB and electronic components among its target applications.

Real UV Laser Parameters: What the Buyer Should Look At

JQ’s published UV laser marking machine specifications provide a useful real-world reference for a compact industrial UV system.

These are machine-level published specifications. They should not be interpreted as a guarantee that every material will mark at the maximum listed speed or accuracy.

Real CO₂ Laser Parameters for Non-Metal Applications

For a specific 30W CO₂ configuration, JQ’s published product information lists 10.64μm wavelength, air cooling and a maximum engraving speed of up to 15,000mm/s under its stated specification conditions. Actual production speed depends on material, lens, artwork and parameters.

UV vs CO₂: How I Decide Between Them

Why the Same Plastic Can Produce Completely Different Laser Results

This is one of the most important sections for anyone buying a laser marking machine.

Imagine two products both labeled “ABS”. One produces a clean dark mark with a UV laser. The other produces a weak gray mark. The customer may assume that one machine is defective. In reality, the plastic formulation may be different.

Factors That Can Change Laser Marking Results

• Pigments: Different pigments absorb different wavelengths.
• Laser-sensitive additives: Some plastics are specifically formulated for laser marking.
• Glass fiber: Reinforced engineering plastics can behave differently from unfilled polymers.
• Flame retardants: Additives can change both optical absorption and thermal behavior.
• Surface coating: A coating can completely change the laser/material interaction.
• Color: Black, white, transparent and colored plastics may respond differently.
• Surface texture: Rough and polished surfaces can produce different visual contrast.

How to Build a Plastic Laser Parameter Test

Plastic applications should normally be tested systematically. Randomly changing power and speed can make the test difficult to reproduce.

Step 1 — Define the Desired Mark

• White mark
• Black mark
• Color change
• Surface removal
• Deep engraving
• High-resolution QR code

Step 2 — Establish a Conservative Starting Point

Begin with a relatively low thermal load when working with sensitive plastics. The goal is to understand the material response before increasing energy density.

Step 3 — Test Speed and Power as a Matrix

Instead of testing one parameter at a time, create a small grid with several power levels and scanning speeds.

Step 4 — Inspect the Material

• Is there melting?
• Is the edge sharp?
• Is the mark uniform?
• Is there discoloration?
• Is the surrounding surface damaged?
• Is there residue?

Step 5 — Test Durability

A beautiful mark is not necessarily a good industrial mark. Rub resistance, cleaning resistance, chemical resistance and environmental exposure should be tested according to the actual product requirement.

Real Purchasing Scenarios: Which Machine Would I Recommend?

7 Common Failures in Plastic and Non-Metal Laser Marking

1. The Plastic Melts

The process may be introducing too much thermal energy. Consider wavelength, pulse characteristics, speed and power rather than simply increasing or decreasing one number.

2. The Mark Has Low Contrast

The material may not have the required absorption characteristics for the selected wavelength, or the plastic may not contain suitable laser-sensitive additives.

3. The Edges Are Too Wide

Focus, spot size, pulse characteristics and thermal diffusion can all influence edge quality.

4. Transparent Plastic Is Difficult

Transparent materials often require a different process strategy from opaque plastics. UV should be considered when fine interaction is required.

5. The Result Changes Between Batches

Material formulation or color may have changed. For industrial traceability applications, material consistency should be checked.

6. The Mark Looks Good but Fails Durability Testing

Visual appearance is not the same as production qualification. Always test the downstream cleaning and environmental process.

7. The Supplier Tested a Different Material

This is perhaps the easiest problem to avoid. Send the supplier your actual production sample.

Plastic Laser Marking Machine Buying Checklist

8 Practical Conclusions From a Laser Technician’s Perspective

Technical Data Traceability

The following technical points are based on manufacturer-published information and are separated from the author’s practical recommendations.

• JQ UV Laser Marking Machine: 355nm wavelength, 3W / 5W / 10W / 15W configurations, listed speed up to 8000mm/s and approximately ±0.005mm position accuracy.
• JQ CO₂ Laser Marking Machine: approximately 10.6μm wavelength, 10W / 30W / 60W / 100W configurations, with listed marking speed up to 7000mm/s depending on configuration.
• JPT SEAL 355: 355nm UV laser family with 10–30W models and applications including plastic marking and glass marking.
• Independent technical reference: UV lasers are widely used for high-contrast plastic marking where photochemical interaction and reduced thermal impact are advantageous.

Important: Material compatibility statements in this article should be understood as technology-selection guidance rather than a guarantee for every commercial formulation. Final production parameters must be established using the actual material, artwork, required contrast, cycle time and downstream process.

Quick Laser Marking Application Compatibility Chart

1. Automotive Laser Marking Applications

Automotive marking is one of the clearest examples of why a material chart alone is not enough. An automotive factory may process steel, stainless steel, aluminum, engineering plastics and coated components on the same production line.

Common Automotive Marking Requirements

• VIN-related identification
• Part numbers
• Serial numbers
• DataMatrix codes
• QR codes
• Supplier identification
• Production batch information
• Quality-control information

Recommended Technology by Automotive Material

2. Electronics Laser Marking Applications

Electronics manufacturing is generally more sensitive to heat than heavy metal processing. The part may contain thin plastic walls, PCB traces, coatings, connectors or components close to the marking area.

Typical Products

• PCB
• Electronic housings
• Connectors
• Switches
• IC-related components
• Aluminum housings
• Consumer electronics

Typical Marking Requirements

• Small serial numbers
• QR codes
• DataMatrix codes
• Logo
• Production batch
• Component identification

For small plastic components and PCB traceability, I would normally test 355nm UV before selecting a conventional infrared process. The reason is not simply “UV is stronger”. It is because the shorter wavelength can provide a different material interaction and can reduce unwanted thermal effects in suitable applications.

3. Medical Device Laser Marking

Medical marking has a much higher qualification requirement than ordinary product marking. A mark that looks perfect on day one may not be acceptable after cleaning, passivation, sterilization or repeated handling.

Common Medical Materials

• Stainless steel
• Titanium
• PEEK
• Polyurethane
• Nylon
• ABS and engineering plastics
• Medical packaging plastics

Typical Medical Marking

• UDI
• DataMatrix
• Serial number
• Device identification
• Graduation marks
• Lot / batch information

4. Battery and Lithium Battery Laser Marking

Battery production is a good example of an industry where laser marking is only one step inside a much larger automated manufacturing process.

Battery cells and modules can contain aluminum, copper, steel, polymer films and coated materials. The required marking may include serial numbers, production information and machine-readable traceability codes.

Typical Battery Marking Requirements

• Cell serial number
• DataMatrix
• QR code
• Batch information
• Production date
• Component traceability
• Module identification

Battery Buyer Checklist

1. Required code size
2. Required readability grade
3. Cycle time per cell
4. Marking position accuracy
5. Surface condition
6. Downstream handling
7. Automation interface
8. Vision verification

5. Packaging Laser Marking Applications

Packaging is a high-volume application where production speed and readability often matter more than deep engraving.

Typical Materials

• Plastic bottles
• Plastic caps
• Paper
• Cardboard
• Glass
• Coated packaging
• Films

Typical Marking

• Production date
• Expiry date
• Batch number
• Lot number
• QR code
• Barcode
• Brand information

6. Jewelry Laser Marking Applications

Jewelry is different from industrial traceability because the customer often cares more about fine detail, visual quality and customization than raw production power.

Common Materials

• Gold
• Silver
• Platinum
• Stainless steel
• Titanium

Typical Applications

• Name engraving
• Date engraving
• Logo engraving
• Serial numbers
• Pattern engraving
• Inside-ring engraving
• Custom jewelry

7. Aerospace Laser Marking Applications

Aerospace parts require permanent identification and traceability, but the marking process must also respect the material and component requirements.

Common Materials

• Titanium
• Aluminum
• Stainless steel
• Nickel alloys
• Engineering plastics

Typical Marking

• Part identification
• Serial number
• DataMatrix
• Manufacturing information
• Inspection information

Aerospace buyers should pay particular attention to whether the marking process changes the surface in a way that could affect the component’s intended use.

For simple identification, conventional pulsed fiber technology may be suitable. For applications involving very strict surface integrity requirements, specialized ultrafast laser processes may need to be considered.

8. Product Traceability: The Application That Connects All Industries

If I had to choose one laser marking application that appears across almost every industry, it would be product traceability.

Automotive, electronics, medical, battery, aerospace and industrial machinery can all require permanent identification.

Typical Traceability Data

• Serial number
• Batch number
• Lot number
• Production date
• DataMatrix
• QR code
• Barcode
• Part number
• Supplier code

When Should You Buy a Standard Laser Marker vs an Automated System?

20W, 30W, 50W or 100W: Application-Based Selection

Laser Marking Machine Purchasing Decision Tree

5 Realistic B2B Purchasing Scenarios

Application Test Protocol Before You Buy

For serious B2B purchases, I recommend asking the supplier to perform the following test before placing the order.

1. Use the customer’s actual production material.
2. Mark the customer’s actual artwork.
3. Use the requested marking dimensions.
4. Record the actual cycle time.
5. Record the laser source model.
6. Record power, speed, frequency and other relevant parameters.
7. Check the mark after cleaning or downstream processing.
8. Verify QR/DataMatrix readability if applicable.
9. Repeat the test on multiple samples.
10. Keep the test result as part of the purchasing specification.

Industry-Level Laser Marking Decision Matrix

10 Practical Conclusions for Buyers

Application Data Traceability

The application recommendations in this section distinguish manufacturer-published application information from practical purchasing recommendations.

• Medical plastics: Coherent documents UV laser marking of medical plastics and disposables, including catheters, inhalation masks, syringes and pharmaceutical bottles.
• Battery traceability: Coherent’s battery manufacturing documentation identifies permanent marking and traceability for battery cells and modules and gives a published example of a 5 × 5 mm DataMatrix produced in less than one second.
• Medical stainless steel: Coherent describes specialized picosecond processing for permanent black marking of stainless-steel medical devices where corrosion/passivation resistance is important.
• UV marking: Coherent’s Matrix UV platform includes 5W and 10W systems operating at 50–300kHz for high-contrast marking applications in consumer goods, industrial electronics and packaging.

The power ranges and machine configurations in this article are starting points, not guaranteed production specifications for every application. The final configuration should be established through sample testing, cycle-time verification and downstream-process validation.

Quick Answer: What Do Laser Marking Parameters Actually Control?

1. Laser Power

Laser power is the most obvious parameter, but it is also one of the most misunderstood.

A higher-power laser does not automatically produce a better mark. Power becomes valuable when the application requires higher material removal, faster production or deeper engraving.

Typical Power Logic

2. Scanning Speed

Scanning speed determines how quickly the laser beam moves across the workpiece. It has a major influence on the energy delivered per unit distance.

In simple terms: higher speed generally reduces the amount of energy deposited along each path.

Common Parameter Relationships

• High power + low speed → stronger material interaction
• Low power + high speed → lighter marking
• High power + high speed → can be useful for faster production
• Low power + low speed → can still create significant thermal effects

3. Laser Frequency

Frequency is usually expressed in kHz and represents the pulse repetition rate.

It is particularly important for pulsed fiber and MOPA laser processing. Changing frequency changes the relationship between pulse energy, average power, pulse overlap and material interaction.

Why Frequency Matters

For a given average power, increasing the pulse repetition frequency generally means the energy is distributed across more pulses. Therefore, individual pulse energy can decrease.

This is one reason why the same average laser power can produce different marking behavior at different frequencies.

4. Pulse Width

Pulse width describes how long each laser pulse lasts. It becomes particularly important when comparing conventional Q-switched fiber lasers with MOPA fiber lasers.

Coherent explains that Q-switched fiber lasers generate nanosecond pulses whose characteristics are related to frequency, while MOPA systems provide greater flexibility in controlling pulse duration and pulse behavior. This flexibility can be especially useful for plastic marking. :contentReference[oaicite:1]{index=1}

Why MOPA Can Be Useful

• Different pulse widths can be tested
• Thermal interaction can be adjusted
• Plastic marking flexibility can improve
• Anodized aluminum black marking can be optimized
• Special stainless-steel effects can be investigated

Real MOPA Parameter Example: Black Marking on Anodized Aluminum

One useful public reference comes from Trotec’s application documentation. For a 20W MOPA laser and F-254 lens, it gives the following example for black marking on anodized aluminum:

Trotec specifically warns that anodized layers can vary significantly, so these values should be treated as an application reference, not as a universal recipe. :contentReference[oaicite:2]{index=2}

5. Hatch Spacing / Line Spacing

Hatch spacing controls the distance between adjacent laser scan lines when filling an area.

Smaller spacing means more scan lines are used to fill the same area. This generally increases processing time and can increase cumulative energy input.

Simple Example

Trotec’s anodized-aluminum black-marking example illustrates this clearly: it uses a 0.001mm bidirectional filling-line distance for a rich black result, while larger 0.002–0.005mm spacing can produce gray tones. :contentReference[oaicite:3]{index=3}

6. Number of Passes

A single pass may be sufficient for surface marking. Deep engraving normally requires multiple passes.

Increasing the number of passes increases the cumulative processing time, but it also provides more opportunities to remove material gradually.

Surface Marking vs Deep Engraving

Trotec’s deep-engraving guidance explicitly describes deep engraving as a process using multiple passes and notes that quality-optimized processing can take substantially longer than time-optimized processing. :contentReference[oaicite:4]{index=4}

7. Focus and Defocus

Focus determines the laser spot size on the workpiece. In many precision marking applications, the smallest spot is obtained near the focal plane.

However, defocusing can sometimes be useful. A larger spot reduces energy density and can change the way heat is distributed.

8. Stainless Steel Parameter Starting Windows

The following ranges are intended as starting test windows. They are not guaranteed production recipes.

As a public reference, Trotec lists approximately 2000mm/s, 60kHz and one pass for a 20W fiber polishing process on stainless steel, while its annealing example uses 80–100% power, 80–120mm/s, approximately 20–30kHz and deliberate defocus. These examples demonstrate how dramatically parameters can change according to the desired effect. :contentReference[oaicite:6]{index=6}

9. Deep Engraving: Why Lower Frequency Can Matter

Deep engraving is fundamentally different from simple surface marking. The objective is to remove material rather than simply change its color.

Lower frequency can increase the energy available per pulse for a given average power, which can be useful when material removal is the goal.

Trotec’s deep-engraving guidance describes stainless-steel deep engraving as requiring high power, relatively low frequency and slower scanning speeds, with published examples in the 250–900mm/s region for the process. :contentReference[oaicite:7]{index=7}

10. Aluminum Parameter Strategy

Aluminum applications vary greatly depending on whether the surface is raw, anodized, painted or coated.

Raw Aluminum

Start with moderate power and relatively high speed, then adjust according to contrast and surface response.

Anodized Aluminum

If the goal is black marking while preserving the anodized layer, MOPA is particularly useful because short pulse durations can be selected.

Trotec’s published 20W MOPA example uses: 50% power, 1500mm/s, 200kHz, 8ns and one pass for a rich black result under its specified conditions. :contentReference[oaicite:8]{index=8}

The same source notes that larger filling-line distances can produce gray tones, while very dense filling can create deeper black. :contentReference[oaicite:9]{index=9}

11. Copper Parameter Strategy

Copper requires more caution because of its high reflectivity and thermal conductivity.

Starting Test Strategy

1. Start with a moderate power setting.
2. Use a parameter matrix rather than one fixed value.
3. Test several frequencies.
4. Compare contrast and heat-affected area.
5. Measure actual production cycle time.

If the application involves deep engraving or large copper areas, a higher-power source may become economically more attractive.

12. Plastic Parameter Strategy

Plastic processing should normally begin with the goal of controlling heat.

UV is especially valuable for plastics because its high-energy photons can directly break molecular bonds and produce photochemical color changes, reducing the need to rely entirely on thermal melting or ablation. :contentReference[oaicite:10]{index=10}

13. Practical Parameter Matrix for Common Materials

The table below is intended as a testing framework. It should not be copied directly into production without sample validation.

14. How a Technician Builds a Parameter Test Matrix

Instead of guessing one “perfect” parameter, I normally create a small parameter matrix.

Example: Stainless Steel

This approach makes it easier to identify whether the main variable is power, speed or frequency instead of changing everything simultaneously.

15. Black Marking vs Deep Engraving: Do Not Use the Same Parameters

16. Parameter Troubleshooting: What Does the Result Tell You?

17. What Parameters Should a Laser Supplier Give You?

If you are buying a machine for production, I recommend asking the supplier to provide a parameter sheet rather than simply sending a finished sample.

18. The 10 Parameter Rules I Use in Real Laser Testing

Technical Parameter References

The numerical examples in this section are separated into two categories: manufacturer/application-lab references and practical starting windows.

• Published application reference: Trotec provides a 20W MOPA example for black marking anodized aluminum using 50% power, 1500mm/s, 200kHz, 8ns and one pass under its specified setup. :contentReference[oaicite:11]{index=11}
• Published stainless-steel reference: Trotec documents different parameter strategies for polishing and annealing, demonstrating that surface appearance and annealing require substantially different process windows. :contentReference[oaicite:12]{index=12}
• Deep-engraving reference: Trotec notes that deep stainless-steel engraving uses multiple passes and can require substantially more processing time when optimized for quality. :contentReference[oaicite:13]{index=13}
• Technology reference: Coherent explains the difference between Q-switched and MOPA fiber lasers and highlights the greater pulse-control flexibility of MOPA systems. :contentReference[oaicite:14]{index=14}
• UV plastic reference: Coherent explains that UV laser photons can directly interact with polymer bonds, enabling photochemical color changes with reduced thermal effects on suitable plastics. :contentReference[oaicite:15]{index=15}

All other numerical ranges presented in this section should be understood as engineering test windows, not guaranteed production parameters.

Final Laser Marking Material Compatibility Decision Guide

Choosing a laser marking machine should start with the material, but material compatibility alone is not enough. The correct production laser depends on the material grade, surface treatment, required mark, marking speed, contrast, depth, thermal sensitivity, part geometry and production volume.

In practical terms, a material can sometimes be marked by more than one laser wavelength. The important question is not simply “Can this laser mark the material?” but “Which laser produces the required result consistently and economically in production?”