MKS Instruments launches BeamWatch AM-3 for metal AM
MKS Instruments, Inc, headquartered in Andover, Massachusetts, USA, has introduced the Ophir BeamWatch AM-3, a beam analysis system developed for laser-based metal Additive Manufacturing applications, including Laser Beam Powder Bed Fusion (PBF-LB).
The compact, integrated system provides real-time, non-contact measurement of the laser beam caustic – including near field, focus and far field – together with absolute laser power. Measured parameters include waist (focus spot) width and location, focal shift, centroid position, M² (Beam Parameter Product, BPP) and Rayleigh length. In metal Additive Manufacturing processes, these parameters are critical for maintaining consistent melt pool behaviour and build quality.
The BeamWatch AM-3 incorporates a higher-sensitivity, higher-resolution camera designed for faster acquisition and improved detection of focal shifts. The system can characterise focal spots down to 35 μm and operate with both medium- and high-power laser sources. Standard wavelength coverage is 1030–1100 nm; additional wavelengths are available on request.
Beam caustic measurement is achieved by imaging Rayleigh scatter from two directions, enabling beam propagation and M² measurement in accordance with ISO 11146. As a non-contact method, the system avoids inserting optics into the beam path, reportedly reducing the risk of component damage and measurement artefacts. Real-time monitoring also enables detection of dynamic focal shift during laser start-up and thermal stabilisation.
“Additive Manufacturing users need to know where the system’s laser is focusing, if the focus is stable, and, if not, where focus occurs after the system has thermally stabilised,” stated Reuven Silverman, General Manager, Ophir Photonics Products. “This information is crucial for avoiding structural weaknesses, captured stress, and voids in the AM build. The Ophir BeamWatch AM-3 beam analysis system solves these problems by providing detailed information about key laser beam parameters and how they change with time in order to help maintain the quality and repeatability of the manufactured parts.”
The BeamWatch AM-3 integrates a NIST-traceable power sensor for analysis of laser power density profiles and is supplied with BeamWatch software for caustic and power analysis. Data can be displayed in tabular, 2D and 3D formats, with USB connectivity for Windows-based PCs.
The system is available immediately.
