Když buying a CO₂ laser machine, many suppliers highlight the maximum galvanometer scanning speed first. Numbers such as 10,000 mm/s, 30,000 mm/s or even higher may look impressive.
However, scan speed alone cannot determine scanner quality.
For a CO₂ fractional laser system, the scanner must also provide accurate positioning, stable movement, consistent pattern coverage and reliable performance after continuous operation. A fast scanner with poor repeatability or unstable optical performance may produce less consistent results than a slower but better-calibrated system.
If you are comparing the complete system rather than only the scanner, read our CO₂ fractional laser machine buying guide.
This guide explains what a CO₂ laser galvanometer scanner does, why speed is only one part of the equation, and what buyers should check before purchasing.
What Is a CO₂ Laser Galvanometer Scanner?
A galvanometer scanner, also called a galvo scanner, is the beam-steering system inside a laser machine.
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A typical two-axis scanner uses:
- One mirror for the X-axis
- One mirror for the Y-axis
- Galvanometer motors
- Position sensors
- Servo drivers and control electronics
- Beam-delivery optics
- A focusing or F-theta lens
The scanner rapidly changes the angle of the mirrors to move the laser beam across the treatment field. In a fractional CO₂ laser, this movement controls the shape, spacing and coverage of the laser pattern.
The scanner should therefore be evaluated as part of a complete optical and control system, not as an isolated “speed” component. Commercial suppliers commonly separate scanner speed, acceleration, accuracy, resolution and repeatability into different specifications. SCANLAB a Thorlabs both present these as separate performance indicators.
Why Scan Speed Alone Is Not Enough
1. Maximum speed may not be the actual working speed
A supplier’s maximum speed may refer to:
- Jump speed when the laser is not firing
- A short-distance movement
- A specific mirror size
- A limited working field
- A test performed without real treatment patterns
- A theoretical maximum under ideal conditions
The actual working speed can be affected by the scan field, beam diameter, mirror aperture, pulse width, line spacing, pattern density and laser synchronization.
When comparing machines, ask whether the advertised figure is the maximum speed, jump speed or actual laser-on working speed.
2. Accuracy and repeatability affect pattern quality
Accuracy describes how closely the scanner reaches the intended position. Repeatability describes whether it returns to the same position consistently.
Další informace: 5 testů pro kontrolu CO₂ frakčního laserového stroje před nákupem.
These specifications are especially important for fractional CO₂ systems. If the scanner does not return to the correct position, the spacing between laser spots or lines may become inconsistent.
A high-speed scanner with poor repeatability may create:
- Uneven treatment density
- Irregular pattern spacing
- Overlapping or missing areas
- Inconsistent results near pattern edges
- Differences between the center and edge of the treatment field
3. Acceleration and settling time affect corners and line ends
A scanner does not instantly reach its maximum speed. It must accelerate, decelerate and settle at the correct position.
Poor dynamic response can cause:
- Rounded corners
- Overshoot at line ends
- Uneven energy distribution
- Irregular geometric shapes
- Visible differences between fast and slow patterns
For this reason, acceleration, deceleration and settling performance may be more useful than maximum speed when evaluating complex patterns.
4. Thermal stability matters during long sessions
A scanner may perform well during a short demonstration but behave differently after continuous operation.
Heat can affect:
- Motor response
- Position accuracy
- Mirror movement
- Controller performance
- Calibration stability
Ask the supplier whether the scanner has been tested after warm-up and during extended operation. A reliable system should maintain consistent pattern geometry throughout a normal working session.
5. Optical matching affects the final result
The scanner must be matched with the correct mirrors, beam diameter and focusing optics.
For a CO₂ laser system, buyers should confirm that the mirror coating and lens transmission are specified for the operating wavelength, commonly 10.6 μm. The F-theta lens or equivalent focusing optics must also match the selected working field and beam parameters.
Poor optical matching may lead to:
- Different spot sizes across the field
- Reduced performance near the edges
- Uneven focus
- Distorted treatment patterns
- Lower energy consistency
The scanner, mirrors, drivers, controller and optics should be evaluated as one integrated system. Companies such as Novanta list these components as connected parts of a complete laser-beam delivery and scanning solution.
For a deeper explanation of pulse width and spot size, see our CO₂ pulse width and spot size guide.
Key Specifications Buyers Should Check
| Specifikace | What It Tells You | Proč na tom záleží |
|---|---|---|
| Maximum scan speed | The highest stated mirror movement speed | Useful, but may not represent real treatment speed |
| Working or marking speed | Speed while the laser is actively scanning | More relevant than jump speed |
| Jump speed | Movement speed when the laser is off | Helps reduce idle movement time |
| Position accuracy | How closely the beam reaches the target position | Affects pattern geometry |
| Repeatability | Whether the scanner returns to the same position | Affects treatment consistency |
| Resolution | The smallest controllable movement | Important for fine pattern control |
| Acceleration | How quickly the scanner reaches operating speed | Affects productivity and pattern response |
| Settling time | How quickly the mirror becomes stable at a target position | Helps reduce overshoot and line-end errors |
| Linearity | How accurately the actual pattern follows the intended geometry | Important across the entire field |
| Thermal stability | Whether performance remains stable after warm-up | Important for long treatment sessions |
| Mirror aperture | The usable optical opening of the mirror | Must match beam diameter and energy requirements |
| Lens compatibility | Whether the focusing optics match the wavelength and field size | Affects spot size and edge uniformity |
| Controller synchronization | Coordination between scanner movement and laser firing | Affects delivered pattern consistency |
How to Test a CO₂ Galvanometer Scanner Before Buying
A buyer should request more than a speed number. Ask for a live demonstration, sample test pattern or performance report.
1. Test a square and grid pattern
Check the pattern at the center and near all four corners of the working field.
Look for:
- Straight lines
- Consistent dimensions
- Clean corners
- Equal spacing
- Minimal edge distortion
2. Repeat the same pattern several times
Run the same pattern repeatedly and compare the results.
A reliable scanner should produce nearly identical patterns each time. Differences in line position, spacing or shape may indicate poor repeatability or calibration.
3. Test after warm-up
Repeat the pattern after the machine has been operating for a period of time. Compare the result with the initial pattern.
This helps identify thermal drift that may not appear during a short demonstration.
4. Test different pattern densities
A scanner may perform well with a simple pattern but struggle with dense or overlapping patterns.
Ask the supplier to demonstrate:
- Low-density patterns
- High-density patterns
- Small geometric patterns
- Large-area patterns
- Different pulse and line-spacing settings
5. Verify laser synchronization
The scanner and laser source must work together accurately. If the laser fires before or after the mirror reaches the intended position, the treatment pattern may become uneven.
Ask how the system controls:
- Laser pulse timing
- Line spacing
- Point spacing
- Start and stop timing
- Speed changes during scanning
6. Request complete test conditions
A performance number is difficult to compare without test conditions. Ask the supplier to provide:
- Scanner model
- Mirror aperture
- Working field
- Lens model
- Beam diameter
- Vlnová délka laseru
- Working speed
- Jump speed
- Accuracy and repeatability data
- Warm-up conditions
- Calibration method
Questions to Ask the Supplier
Before purchasing a CO₂ laser machine, ask:
- Is the quoted speed maximum speed, jump speed or working speed?
- Is the speed measured with the laser firing?
- What are the accuracy and repeatability specifications?
- Has the scanner been tested after warm-up?
- What scanner, mirror and controller brands are used?
- Is the optical system designed for the selected CO₂ wavelength?
- How is edge distortion corrected?
- Can the supplier provide a grid or pattern test report?
- What happens if the scan head or driver needs replacement?
- Are the scanner and lens calibrated as a complete system?
- Profesionální training and operator support are also important when evaluating a CO₂ laser supplier.
Často kladené otázky
Is a 30,000 mm/s scanner always better than a 10,000 mm/s scanner?
No. A faster scanner may reduce movement time, but it is not automatically more accurate or more stable. Accuracy, repeatability, acceleration, thermal stability and optical matching should also be compared.
What is the most important scanner specification?
For a fractional CO₂ laser, buyers should focus on the complete combination of working speed, positioning accuracy, repeatability, pattern uniformity, thermal stability and laser synchronization.
Can a high-speed scanner shorten treatment time?
It may help, but total treatment time also depends on the pattern, spot size, pulse width, line spacing, working field and laser output. A very high speed is useful only when the laser and control system can maintain consistent energy delivery.
Does the scanner brand guarantee good performance?
A reputable brand can reduce risk, but the final result also depends on the mirrors, lens, controller, calibration and system integration. Always evaluate the complete machine and request actual test data.
How can buyers compare two machines fairly?
Use the same comparison conditions:
- Same working field
- Same lens type
- Same beam diameter
- Same pattern
- Same pulse settings
- Same operating time
- Same test locations
Comparing only the maximum speed listed on two brochures may produce a misleading conclusion.
Final Buyer Checklist
A good CO₂ laser galvanometer scanner should provide:
- Appropriate working speed
- Stable accuracy and repeatability
- Fast and controlled acceleration
- Low overshoot and short settling time
- Consistent performance after warm-up
- Correct mirror and lens matching
- Reliable laser synchronization
- Uniform patterns across the working field
- Clear calibration and test documentation
- Accessible technical support and replacement service
The best scanner is not necessarily the one with the highest advertised speed. It is the one that can move the beam accurately, repeatedly and consistently under real operating conditions.
When evaluating a CO₂ laser machine, ask to see the complete scanning system in action—not just a number on a specification sheet.
