Laser processing in 2D, 2.5D or 3D: A polygon scanner can support different processing strategies. The important questions are what these terms mean for the application and how the scanner, software, laser and machine axes each contribute.

One point matters for choosing the right system: the polygon mirror alone does not move the beam in three spatial directions. In a MOEWE system, the polygon provides fast deflection along a scan line. A second deflection axis, such as a galvo mirror, positions that line across the field. Depth information and three-dimensional processing come from the data workflow and the integration of the required process functions.

2D: contours and surfaces in one processing plane

In 2D processing, the laser beam is guided in the X-Y plane. The polygon mirror provides the fast scan direction, while a second axis positions the line step by step or along the required path. The job can be supplied as vector data or a bitmap.

Typical applications include marking, cutting, cleaning, drilling and microstructuring on a flat or focused workpiece plane. The scanner controller synchronises beam position with the laser and the process data.

2.5D: creating depth through stepped processing

In 2.5D processing, the job adds spatially varying depth information. Depending on the software mode, that information may be represented by a grayscale image or a depth map. The scanner processes the field in multiple passes, removing material step by step to create the required relief.

This approach can produce engravings, height levels and fine surface structures. The process typically remains tied to one processing plane or to defined depth steps. 2.5D therefore does not automatically mean continuous Z movement during every scan line. Material removal, depth and repeatability need to be calibrated for the laser, material and optics.

3D: converting volume data into scan paths or layers

Three-dimensional geometries can be supplied as 3D data, such as STL files, and divided into individual layers or scan paths. A dedicated real-time slicer calculates the processing data from the 3D model; the polygon scanner then moves rapidly within each plane.

For layer-based processes, the machine configuration adjusts the Z position between layers. If the focus must continuously follow a curved surface, the overall system also needs suitable dynamic focusing or a synchronised Z axis. The required solution depends on the geometry, depth range, optics and process. Not every scanner configuration includes the same 3D functions or options.

The differences at a glance

What the polygon scanner contributes

A polygon scanner is especially useful when fast, consistent line deflection determines process throughput. MOEWE PM systems combine a polygon axis with a second deflection axis. Depending on the system, the software processes bitmap and vector data; selected configurations also offer 2.5D engraving and a real-time 3D slicer for 3D files.

To turn a 3D model into a reliable process result, the scanner, laser control, focus position, axis motion and data preparation must work together. The right solution depends on the workpiece geometry, not just on the label “3D”.

Which information helps with system design?

• material, laser wavelength and available power,
• scan field, spot size and working distance,
• required depth or Z range and tolerance,
• data format and planned processing strategy,
• cycle time, line speed and target surface quality,
• available focus adjustment, Z axis and machine control.

Conclusion

2D describes beam guidance in one plane. 2.5D adds stepped depth information. 3D converts spatial data into layers or coordinated scan paths and may require additional focus or Z-axis functions, depending on the geometry. A polygon scanner provides the fast scan motion; the complete 2.5D or 3D capability comes from the coordinated system.

Frequently asked question

Can every polygon scanner focus in three dimensions on its own?

No. A polygon scanner provides the fast scan motion. 3D data processing, dynamic focusing or a synchronised Z axis depend on the model, software options and machine integration.

Planning a 2.5D or 3D process?

Share your material, laser, scan field and depth range, together with your data format and target cycle time. MOEWE Optics can use this information to assess which scanner and integration configuration fits your application.

When large scan fields are processed, speed is only one part of the equation. The beam must also cover the field uniformly, while position, spot size and energy distribution remain predictable from the centre to the edge.

MOEWE dual-polygon optics distributes beam deflection across two coordinated polygon stages. This creates additional degrees of freedom for the optical design, control system and calibration. When properly designed, the approach can reduce field-dependent distortions and improve process consistency across the complete scan field.

The challenge: large scan fields are not automatically homogeneous

With a single deflection element, the geometric conditions change with the scan angle. At the edge of the field, the beam follows a different path through the optics than it does at the centre. The angle of incidence, effective spot size, line spacing and energy density can change at the same time.

For industrial applications, this means that a part may be processed differently in the centre and at the edge even though the nominal process parameters are identical. Typical effects include:

• deviating feature dimensions or contours at the field edge,
• different line widths and overlaps,
• variations in energy input,
• higher requirements for calibration and correction models.

How MOEWE dual-polygon optics works

Instead of concentrating the complete deflection on a single polygon stage, the dual-polygon design coordinates two deflection stages. Depending on the system architecture, the two stages handle different components of the beam deflection or work together in a coordinated combination.

The objective is not simply to add more optics. It is to distribute the geometry more effectively: each stage represents a smaller or more controlled part of the overall movement. The resulting field geometry can therefore be modelled more precisely and matched to the application.

Why the scan-field distortion is reduced

1. Lower angular load per polygon stage: Distributing the required deflection across two stages can reduce extreme angle changes at each stage. This creates more favourable conditions for the subsequent focusing optics.
2. More degrees of freedom for correction: The spot position can be described through the coordinated movement of both stages. Optics, control and calibration can therefore be matched more closely to the actual field geometry.
3. More manageable field edges: The most critical deviations often occur where the beam is deflected far from the optical axis. Distributed deflection can reduce this sensitivity and narrow the difference between the field centre and field edge.
4. More stable process conditions: A more uniform beam path supports a consistent spot geometry and energy density. This can improve repeatability in marking, microstructuring and selected laser-processing applications.

Single polygon and dual-polygon optics compared

What this means for industrial processes

For applications involving large areas and demanding throughput and uniformity requirements, dual-polygon optics can provide several benefits:

• more consistent feature dimensions across the scan field,
• more uniform energy distribution when the system is properly designed,
• improved repeatability in marking and microstructuring,
• more freedom when coordinating scan strategy, focus and calibration.

The actual benefit always depends on the combination of wavelength, laser power, beam diameter, scan field, focal geometry, polygon speed, control system and material.

Optics alone does not determine the result

Dual-polygon optics does not replace careful system design. Reliable results require the optical properties to work together with the control system and a suitable calibration method. Scan direction, acceleration profiles, pulse parameters and the thermal properties of the material also influence the achievable homogeneity.

The relevant question is therefore not only, “How large is the scan field?” The key question is which spot quality, speed, accuracy and energy distribution the process requires at every position in that field.

Conclusion

MOEWE dual-polygon optics reduces scan-field distortions by distributing beam deflection across two coordinated polygon stages. This creates additional degrees of freedom for geometry, control and calibration. Edge deviations can be managed more effectively, supporting more uniform process conditions across large scan fields.

Frequently asked questions

Does dual-polygon optics eliminate every scan-field distortion?

No. It creates better conditions for controlling the field geometry, but it cannot replace precise design, calibration and process optimisation.

Which applications can benefit from the approach?

It is particularly relevant for large areas that must be processed quickly while maintaining uniformity and repeatability, for example in marking, microstructuring or selected laser-processing applications.

Which data is needed for an evaluation?

Useful information includes wavelength, laser power, beam diameter, target spot size, scan field, processing speed, material and process objective.

Would you like to evaluate your scan field?

MOEWE Optics supports the evaluation of suitable scanner and optical configurations. Share your key process data and we can assess whether dual-polygon optics is a good fit for your application.

PM10, PM30 or PM Unit? The best scanner solution depends on more than the desired speed. Scan field, spot size, laser parameters, material, cycle time and machine integration all influence the right choice.

This guide explains the questions that help with selection and when each MOEWE scanner typically belongs on the shortlist. The final configuration should always be evaluated against the real process data.

The three key selection questions

1. How large is the required scan field? Field size and target resolution determine the optical and mechanical design.
2. How fast must the process be? Marking time, line speed, acceleration and repetition rate work together.
3. How much adaptation does the scanner need? A standard integration has different requirements from a customised OEM solution.

PM10: compact and focused

PM10 is a natural choice when a compact scanner solution is needed for clearly defined tasks. It is particularly relevant when size, straightforward integration and a balanced combination of speed and precision are important.

Typical use cases include compact marking and structuring tasks, small to medium working fields or machines where installation space is limited. The planned scan field, target spot size and process speed must, of course, match the optical design.

Consider PM10 when:

• a compact standard solution is required,
• the scan field is manageable and clearly defined,
• installation space and integration effort are important factors,
• the process needs a good balance between dynamics and precision.

PM30: more reach and throughput

PM30 typically comes into consideration when a larger working field or higher throughput is central to the application. Larger parts and productive series processes require field coverage, spot quality, speed and process homogeneity to be considered together.

A larger scan field is not automatically the better solution. As field size increases, the requirements for optics, calibration and process control also increase. PM30 is therefore particularly interesting when the application genuinely needs the additional reach and the process parameters can be designed around it.

Consider PM30 when:

• larger areas or parts need to be processed,
• short cycle times and high throughput are decisive,
• field coverage matters more than the smallest possible housing,
• optics, control and calibration can be designed as one system.

PM Unit: when integration defines the solution

PM Unit is the right starting point when an application goes beyond a typical standard configuration. The focus is then not only on scanner size and speed, but on how the scanner becomes part of the complete machine or production line.

This can be relevant when special mechanical interfaces, a specific beam path, defined installation requirements, customised control or a coordinated multi-component solution is needed. PM Unit should therefore be included early in the system planning process.

Consider PM Unit when:

• a customised OEM or machine integration is planned,
• standard dimensions or interfaces are not sufficient,
• optics, mechanics, electronics and software must be coordinated,
• the solution should be optimised for a specific process rather than a generic data sheet.

PM10, PM30 or PM Unit compared

Which data should be available before selection?

The more precise the starting data, the faster the right configuration can be identified. Useful information includes:

• laser wavelength and available power,
• required scan field and working distance,
• target spot size and positioning accuracy,
• line speed, cycle time and repetition rate,
• material, geometry and processing task,
• installation space, interfaces and environmental conditions.

The short decision guide

PM10 is a good starting point for compact and clearly defined applications. PM30 should be evaluated when a larger field or more throughput is required. PM Unit is useful when system integration, interfaces or process requirements call for an individual design.

Selection should not be based on one specification in isolation. The interaction between scan field, spot, speed, laser and machine reveals which scanner provides the best solution in the real process.

Frequently asked questions

Is PM30 always better than PM10?

No. A larger or faster system is only beneficial when the application needs those characteristics. For compact fields, a smaller and appropriately configured solution may integrate better.

When should PM Unit be planned?

As early as possible when special interfaces, beam paths, installation constraints or OEM integration are foreseeable. This allows optics, mechanics and control to be designed together.

Can MOEWE support the selection using sample data?

Yes. Information about the material, laser, scan field, spot size, speed and process objective allows the appropriate scanner class to be evaluated in a targeted way.

Not sure which scanner is right?

Share your key process data with us. MOEWE Optics can help assess whether PM10, PM30 or PM Unit is the right starting point for your application.