Galvanometer Laser Scanner: Key Components, Features, and Top Choices

Mirror galvanometers control mirrors that reflect laser beams along orthogonal axes in a galvanometer laser scanner. This setup allows accurate and fast laser beam placement over a target surface. The system uses closed-loop control with capacitive or optical sensors for location feedback. It gives great beam placement,high resolution, and accuracy. Laser marking and engraving are some industrial applications requiring reliability and precision.

Key Components of Galvanometer Laser Scanner

l   Galvanometer

The speed and accuracy of a galvanometer laser scanner depend on its galvanometer. Commonly,galvanometers use electromagnetic motors to position mirrors. Closed-loop control systems use sensor positioning feedback for better motor performance.Real-time sensor data, including rotary encoders, is essential for sub-micron positional precision. Furthermore, the scanner's response and stability depend on rotor inertia and electromagnetic dampening.  

l   Mirror

Galvanometer laser scanners guide the laser beam via the mirror. Mirror material and coating are key. Mirrors might be composed of beryllium or silicon carbide to lower inertia and speed movement. Dielectric materials matched to the laser's wavelength are coated on the reflecting surface to increase reflectivity and decrease energy loss. The mirror's shape and size alter the laser beam's focal features. It influences the scanner's ability to concentrate on different target distances.  

l   Servo Driver Board

A galvanometer laser scanner's servo driver board controls the whole scanning operation. It incorporates motor drivers that provide galvanometer motors with currentdepending on control software input. A defined board design limits electronic noise, which may influence scanning precision. Apart from that,driver boards might utilize complex predictive control algorithms to account for system dynamics and inertia. These characteristics augment motion profiles and reaction times for high-speed, high-precision scanning applications.  

Key Features to Look for in Galvanometer Laser Scanner

l   Speed

Consider the mirrors ' maximum spinning speed when assessing a galvanometer scanner's speed.High-speed galvanometer scanners may reach several degrees per second for fast material processing or high-throughput applications, including PCB marking or laser engraving. Also, consider the system's settling time, which affects how fast it can move and stabilize.

l   Accuracy and Precision

Galvanometer laser scanners must be accurate and precise for micro-machining and medical imaging.Find systems with low angular drift and hysteresis.Undoubtedly, thesestandards guarantee the scanner produces reliable outcomes throughout severaloperations for precision-dependent applications.  

l   Open-Loop or Closed-Loop System

Control and feedback techniques determine whether an open-loop or closed-loop galvanometer laser scanner is used. Open-loop systems use pre-set motor characteristics without real-time feedback and are cheaper. Closed-loop systems use encoders orother sensors to compensate for mirror position differences. It is necessaryfor high-fidelity jobs that need positional precision.  

l   Dynamic Performance

In dynamic situations, including adaptive laser cutting or changeable material processing, galvanometer laser scanners must be sensitive to changing operational requirements. The mechanical resonance frequency and damping ratio govern how promptly the scanner can adjust speed or direction with out oscillations. Besides that, dynamic systems need thermal stability to function well under high-duty cycles and altering operating circumstances.  

l   Field of View (FOV) and Working Area

The range of a galvanometer laser scanner relies on its FOV and working area. Industrial applications, including textile processing and wide-format engraving, benefit from systems with an FOV of several hundred square centimeters. The focal length of the optics should be considered. Longer focal lengths give bigger FOVs but diminish laser spot intensity.That impacts processing efficiency and resolution. Thus, the choice must match the application's accuracy and scale.  

SPD Series 3D Galvo Head from SOING

SOING's SPD series 3D galvo scan heads improve industrial laser applications. The SPD12 and SPD20 models, which have touch panels for field size modification, suit varyingmarking demands and operate well in different marking conditions. The SPD12 provides 1064 nm and 355 nm wavelengths. The SPD20 offers 10600 nm, 1064nm, and 355nm wavelengths and can handle 100mm×100mm to 600mm×600mm fieldsizes. Our galvanometer laser scanners provide accurate control with less than 8 µrad repeatability and fast writing rates (550 cps for SPD12, 350 cps for SPD20). It renders them ideal for marking on 3D, flat, inclined, and curved surfaces.  


We specialize in RF-excited CO2 lasers that can run 24/7 in aggressive industrial situations. In 2012, we invented expert galvanometer laser scanners, which are essential toour laser scanning solutions for single-axis and multi-axis galvanometers. Our motion control group adds 3D dynamic focusing devices for high-speed,on-the-fly laser marking. Since 2014, our optical department has offeredf-theta lenses and beam expanders to satisfy precise client needs.

Floor 5, Building 7, No. 88, Chunfen Road, Huangpu District, Guangzhou, China 510730

+86 180 2932 3911