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Three-Axis Galvo System Scan Heads
Dynamic Focusing 3-Axis Galvo Scan Head
With Lid On
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.
These 3-Axis Galvo System Scan Heads include XY scanning mirrors and Z-axis focusing elements in order to achieve a large, three-dimensional field of view. Rather than a standard f-theta scanning lens, these scan heads use translating focusing elements to adjust the focal point of the system and maintain a flat scan area. See the 2-Axis vs. 3-Axis tab for details.
Our Dynamic Focusing Scan Heads are capable of achieving field sizes up to 1000 x 1000 mm² or spot sizes down to Ø22 µm, offering flexibility and making them suitable for many applications. The dynamic lens translator continuously adjusts the focus distance via a combination of manual and motorized actuators to produce a flat or contoured field; manual adjustment of the lens position determines the working distance and field size, while fine motorized adjustment provides focal correction while scanning. These scan heads are available with mirrors for Nd:YAG (1064 nm) or CO2 (10.6 µm) lasers.
Our High-Speed Focusing Scan Head is a scanning solution designed to offer 3-axis capabilities in a compact package for field sizes up to 450 x 450 mm². It includes the BLINK high-bandwidth Z-axis focuser for scanning highly contoured surfaces. The fully packaged design allows for easy integration into tabletopworkstations and assembly lines. This scan head includes mirrors coated for Nd:YAG (1064 nm) lasers.
We recommend the SAMLight software package from SCAPS for operating these scan heads; click here for information on this software. Power supplies and cables are sold separately.
For OEM or custom requests, please email TMS-Sales@thorlabs.com.
Field Size vs. Spot Size
Click to Enlarge
Diagram Illustrating Dynamic Focusing to Achieve a Flat Field in Our XG300 Series and DCB320-Y1 Three-Axis Galvo Scan Heads
In a typical two axis laser scanning system, a collimated beam is reflected by the X and Y axis scanning mirrors before entering the focusing (objective) lens. The lens focuses the beam on the work surface. Rotation of the X and Y mirrors causes movement of the focused spot within a flat field. The size of the spot and the size of the field are determined by the lens (and other factors). This configuration is known as a pre-objective scanning system because the laser strikes the scanning mirrors before the focusing (objective) lens. An f-theta lens is a common choice for the lens in this configuration.
The architecture works well as long as the beam diameter and field size are relatively small. For example, applications using beam diameters less than 20 mm and field sizes less than 300 mm are well suited to Z-axis pre-objective scanning.
As the field size requirements grow, larger scan mirrors and laser beam diameters are needed to maintain a numerical aperture (NA) consistent with a small focused spot. F-theta scan lenses for these large laser beams would be big, costly, and impractical. For this reason, a 3-axis scanning solution should be considered.
In a 3-axis scanning system, as shown in the figure to the right, the XY mirrors are placed after the final focusing lens, and hence they are referred to as a post-objective scanning system. Since the laser beam does not move on the objective lens, the lens does not need to be very large; however, this arrangement does not create a flat field. To achieve a flat field, a third axis (Z-axis) of motion is introduced in the form of a linear lens translator.
The typical laser system uses a telescope to expand the laser beam to a diameter consistent with the required NA. The distance between the telescope input lens and objective lens determines the focal distance of the system. By mounting the input lens on a linear lens translator (the third axis), we gain dynamic control over the focal distance. See the diagram to the right for details.
By coordinating the motion of the linear lens translator with the rotation of the X and Y scanning mirrors, we achieve a focused laser spot throughout a flat field. Alternatively, the same configuration can be used to scan a three-dimensional surface. In this scenario, the Z-axis position is an arbitrary function of the X and Y galvo mirror positions, enabling the system to scan complex geometries.
These 3-Axis Scan Heads use a dynamic focusing system, rather than an f-theta lens, to produce a flat field. Each scan head incorporates an XY galvo system plus a linear lens translator (the Z-axis) that can produce a flat or contoured field by dynamically focusing on the surface of the workpiece. The system is designed to create a large scan field with a relatively small spot; spot sizes as small as 30 µm or scan fields as large as 1 m x 1 m are achievable. Various field and spot size combinations can be selected simply by turning a knob to adjust the working distance, while motorized focusing elements can be automated to enable scanning of a flat or contoured surface. The ability to vary the field and spot size offers application flexibility and is ideal for process development and job shop settings.
The Scan Head is used for optical scanning in XY and XYZ applications with lasers of various wavelengths. Configurations are available for a 30 mm max beam diameter and mirrors coated for Nd:YAG (1064 nm) lasers or a 45 mm max beam diameter and mirrors coated for CO2 (10.6 µm) lasers.
The compatible power supply (item # GPWR15), power cable (item # CBLPA16F), and galvo command cable (item # CBLA16D) are sold separately.
The DCB320-Y1 is a scanning solution offering 3-axis capabilities in a compact package for small to medium field sizes. The integrated design features advanced galvanometer technology that provides superior bandwidth, accuracy, and flexibility, and incorporates a high bandwidth Z-axis voice coil actuator for marking on highly contoured surfaces. This 3-Axis scan head is designed to operate seamlessly with the SAMLight laser scan control software and process controllers, making for easy integration into workstations and assembly lines.
The compatible power supply (item # GPWR24) and cable set (item # CBLA16F) are sold separately.