Cross-Flexure Single-Axis Galvo Systems

  • Single-Axis Galvos for Beam Diameters up to 30 mm
  • Cross-Flexure Pivot Mechanism Ideal for Raster Scanning
  • Longer Lifetimes than Traditional Galvos


Square Profile Housing,
Y-Axis Mirror

Round Profile Housing,
Custom Mirror



Included Servo Driver

Related Items

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Key Specifications
Item # SS30X-AG SS30Y-AG SP30X-AG SP30Y-AG
Housing Profile Ø2.00" Round 1.62" x 1.62" Square
Mirror Orientation Horizontal Vertical Horizontal Vertical
Mirror Coating Protected Silver, 450 nm - 10.6 µm
Repeatability <10 µrad
Max Scan Angle
(Optical Angle)
Raster: ±20°
Vector: ±10°


  • Raster Imaging
  • Laser Marking
  • Instrumentation
  • Polygon Facet Correction
  • High-Duty or Small-Angle Applications
Volume Pricing Discount

Large-Volume Orders

For orders where a large quantity of an item is purchased and the delivery of that item is scheduled with our production (i.e., not taken directly from inventory), Thorlabs passes on to the customer the cost savings associated with planned production of high volumes of that item. Since the volume and planned production are key to realizing the cost savings, we ask that you contact us to obtain volume pricing.

Additional requests can include custom optic sizes and coatings, specialized tuning, and variable cable options.

Contact Thorlabs


  • Moving-Magnet Galvanometers with Cross-Flexure Pivot Design
  • 30 mm Max Beam Diameter; Larger Sizes Upon Request
  • Smooth Scanning Motion Ideal for Raster Applications
  • Excellent Cross-Axis Stability
  • No Lubricants; Suitable for Vacuum Applications
  • Longer Lifetime than Ball-Bearing Galvos
  • Servo Driver Included

These Single-Axis Galvanometers use a cross-flexure pivot design to provide smooth, stable scanning motion. The cross-axis flexure design replaces the traditional ball bearing design, eliminating errors due to rumble and lubrication and reducing wear on the components. These moving-magnet galvos are ideal for raster imaging applications, feedback-stabilized imaging systems, or as tracking scanners for viewing or marking moving objects.

The angular orientation (position) of the mirror is measured using a capacitive sensing system, which is integrated into the interior of the galvanometer housing and allows for the closed-loop operation of the galvo mirror system. The galvo systems can be driven to scan their full ±20° optical range when used in continuous raster scanning applications. Operation in vector or point-and-hold applications should be limited to ±10°. See the green box to the left for details.

Cross-Flexure Galvos vs. Ball Bearing Galvos

The cross-flexure pivot mechanism used in these galvanometers is designed for smoother scanning motion and higher cross-axis stability compared to those with ball bearing pivots. The flexure element is rigidly coupled to a single axis, minimizing movement in the orthogonal direction. In continuous raster and small-angle applications, cross-flexure pivots experience less wear and position error than ball bearings, achieving longer device lifetimes and higher repeatability.

However, cross-flexure pivots are not suitable for applications where the mirror must be rotated by a large angle and held in that position. The flexure element is designed primarily to bend and then return to neutral. Applying continuous bending force to the flexure element will significantly reduce its lifetime.

Our cross-flexure galvos are available with the mirror in a horizontal (X) or vertical (Y) orientation. Additionally, each is available in a housing with a Ø2.00" round profile or a 1.62" square profile, for integration into a variety of subassemblies. The mirrors accept beam diameters up to 30 mm; larger mirrors can be provided upon request.

The included servo driver must be connected to a DC power supply, the galvo motor, and an input voltage source (the monitoring connection is optional). For continuous scanning applications, a function generator with a sine wave output is sufficient for scanning the galvo mirror over its entire range. For more complex scanning patterns, a programmable voltage source such as a DAQ card can be used. Please note that these systems do not include a function generator or a DAQ card.

The compatible power supply (item # GPWR15) and cable set (item # CBLS3F) are sold separately. One power supply unit can power up to two galvanometers. One cable set is required for each galvanometer.

Item # SS30X-AG SS30Y-AG SP30X-AG SP30Y-AG
Housing Profile Ø2.00" Round 1.62" x 1.62" Square
Orientation Horizontal
Maximum Beam Diameter 30 mm
Coating Protected Silver
Wavelength Range 450 nm - 10.6 µm
Absolute Reflectance ≥92% (450 - 500 nm)
≥94.5% (500 - 2000 nm)
≥98% (2 - 10.6 µm)
Surface Quality 40-20 Scratch-Dig
Motor and Position Sensor
Linearity (50% Full Travel) >99.9%
Scale Drift 190 ppm/°C
Zero Drift 40 µrad/°C
Repeatability <10 µrad
Maximum Scan Angle
(Optical Angle)
Raster: ±20°
Vector: ±10°
Angular Sensitivity 100 µA/°
Torque Constant 2.8 x 105 dyne·cm/A
Rotor Inertia 8.25 g·cm2
Coil Resistance
5.8 Ω
Coil Inductance @ 1 kHz 450 µh
Operating Temperature 0 to 40 °C
Storage Temperature -10 to 50 °C
Servo Amplifier Specsa
Command Input Range ±5 V
Position Input Scale Factor 0.22 V/° Optical
Command Input Impedance 20 kΩ ± 1% (Differential)
10 kΩ ± 1% (Single Ended)
Position Offset Range ±0.25 V
External Enable See Footnote b
Diagnostic Outputs
Servo Ready 12 V
Position 0.22 V/° Optical
Position Error 0.22 V/° Optical
Velocity Analog (Reference Only)
AGC Voltage Analog (DC)
Coil Current 1 V/A
Analog Output Impedance 1 kΩ ± 1% (For All Outputs)
Power Supply (Not Included)
Input Voltage ±15 to ±24 VDC
<100 mV Ripple
<0.5% DC to 30 MHz Noise
Maximum Drive Current Limit 4 A (RMS); 10 A (Peak)
Quiescent Current 220 mA (Servo Enabled, Galvo at Rest)
Gain Drift Up to 20 ppm/°C
Offset Drift Up to 30 µrad/°C
General Specs
Operating Temperature 0 to 45 °C (With Appropriate Cooling)
Storage Temperature -10 to 60 °C
Dimensions 2.38" x 2.13" x 1.06"
(60.5 mm x 54.1 mm x 27.0 mm)
Mass (Weight) 74 g (2.6 oz)
  • Specifications are obtained after a 2 minute warm-up period.
  • The enable pin is soldered in the on position at the factory. To enable remote control, remove the solder or contact us prior to purchase to obtain an unsoldered unit.
Cross Flexure Galvo
Click to Enlarge

SS30 Galvo Round Body Mechanical Drawing (Shown Without Mirror)
GPWR15 Power Supply Unit Specs
Input 100 - 120 VAC or 220 - 240 VAC
Output ±15 V at 5 A
(150 W Max Power)
Operating Temperature 0 to 50 °C
Dimensions 14.0" x 4.9" x 3.5"
(356 mm x 124 mm x 90 mm)
Cross Flexure Galvo
Click for Details

SP30 Galvo Square Body Mechanical Drawing (Shown Without Mirror)

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Cross-Flexure Galvanometers

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SS30X-AG Support Documentation
SS30X-AGCross-Flexure 1D Galvanometer, Round Housing, X-Axis Mirror
SS30Y-AG Support Documentation
SS30Y-AGCross-Flexure 1D Galvanometer, Round Housing, Y-Axis Mirror
SP30X-AG Support Documentation
SP30X-AGCross-Flexure 1D Galvanometer, Square Housing, X-Axis Mirror
SP30Y-AG Support Documentation
SP30Y-AGCross-Flexure 1D Galvanometer, Square Housing, Y-Axis Mirror
CBLS3F Support Documentation
CBLS3FCommand and Power Cables for QS15/20/30/45, SS, & SP Series Galvo Scanners (Single Axis)
GPWR15 Support Documentation
GPWR15±15 V Power Supply for BLINK & QS, SS, SP, & XG Series Galvo Scanners