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3-Axis Laser Beam Subsystems
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Indisputably the best solution by far for large field processing with small spot diameters. These robust units combine speed and flexibility with working fields of up to 1,500x1,500 mm˛. Available in individual modules, the AXIALSCAN and FOCUSSHIFTER are equipped with innovative RAYLASE technology.
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Benefits of 3-Axis Subsystems
3-axis subsystems were developed due to cost and size limitations on the output lens and the beam aperture limitations with 2-axis deflection units, which limit their ability to produce smaller spot sizes over medium size scanning fields. 3-axis subsystems meet customers' application requirements for large processing fields with smaller spot sizes and allows the user to change the working distance, field and spot size with the same deflection unit. 3-axis technology also benefits applications on the fly with moving targets, while in 3D applications the setup enables processing of non-flat parts or uneven surfaces and high power products. These solutions are now available for frequency Nd:YAG, diode and CO2 lasers.
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Functional Description
In a 3-axis scanning unit the laser beam first enters a moving lens. After the moving lens the beam diverges rapidly until it enters one or two focusing lenses. The beam, now converging, passes through and is directed by a set of X and Y mirrors moved by the galvanometer scanners. The orthogonal arrangement of the X and Y mirrors direct the beam down towards and over the length and width of the working field.
In a subsystem without focus correction, the focused laser spot at the centre of the field describes an arc when moved in either axis, creating a sphere of focused points above the working field. At locations away from the centre of the working field, the laser beam is not focused. This is due to the increased length from the lens to the workpiece, as the scanners direct the beam away from the centre of the field.
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In a 3-axis subsystem, focus compensation is accomplished by slight adjustments in the distance between the moving lens and the focusing lens, as the scanners direct the beam across the working field by a third moving "Z" axis, hence the name "3-axis subsystem".
The Z-axis is referred to in RAYLASE products as the linear translator module, which is an opto-mechanical component for moving the laser spot down the optical axis. The laser beam subsystem can therefore be fitted with different deflection units. The focusing properties of the laser beam subsystem is determined by the linear translator module and, on some versions (FOCUSSHIFTER), also by an F-theta lens on the deflection unit. The linear translator module is fitted with one or two focusing lenses.
RAYLASE currently offers three groups of these subsystems.
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AXIALSCAN
The AXIALSCAN is the perfect solution for small spot diameters and variable working fields for processing materials. The AXIALSCAN is available in several versions with superior optical design enabling very small spot diameters as standard, for large working fields up to 1,500 x 1,500 mm˛. With its high power density the spot works like a scalpel, enabling the use of low performance lasers, considerably reducing system costs. The required size of the working field is set manually in these modules. The AXIALSCAN opens up new application opportunities, such as cutting foils, and gridded materials.
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AXIALSCAN (motorized)
On this model of the AXIALSCAN, the Z-axis inside the linear translator module can be moved by a motor. This enables motorized adjustment of the working field.
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FOCUSSHIFTER
The FOCUSSHIFTER is a recently developed product line, combining XY deflection units (15 or 20 mm aperture) with F-Theta lenses and a pre-focusing unit incorporating the linear translator module. With this configuration, the linear module can be used to change the focusing plane and set the size of the working field. This allows three-dimensional operations to be performed. The diagram shows the schematic principle of this product.
The FOCUSSHIFTER is useful when creating a 3D image in a glass block or for deep processing of materials.
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