Laser Beam Shaping in Additive Manufacturing Systems
Summary
Laser beam shaping has emerged as a pivotal strategy to enhance the precision, efficiency and material properties of metal additive manufacturing processes. By tailoring the spatial intensity distribution of a laser—through methods such as diffractive optics, deformable mirrors or fibre‐based beam modulators—it is possible to control melt‐pool dynamics, reduce defects and steer microstructural evolution. Shaped beams can produce flatter, wider or more uniformly heated melt pools than conventional Gaussian profiles, thereby improving process stability, mitigating spatter or porosity formation and enabling higher build rates. Applications span powder bed fusion, directed energy deposition and laser cladding, with beam profiles ranging from top‐hat and ring‐shaped to dynamically oscillating patterns. Such control of heat input and fluid flow opens avenues for in situ process adaptation and bespoke component properties, reinforcing the global significance of beam‐shaping technologies in advanced manufacturing.
Research from Nature Portfolio
Recent studies have employed high‐speed synchrotron X-ray imaging to elucidate the physics of oscillating beams in powder bed fusion. In these experiments, periodic beam oscillation was shown to modulate keyhole morphology and melt‐pool fluctuations, yielding chevron‐patterned solidification and reduced pore formation. Complementary multiphysics simulations captured the lattice‐Boltzmann fluid flow and heat transfer, confirming that controlled oscillations attenuate long‐range instabilities and improve surface topology. These findings offer a physics‐based rationale for implementing dynamic beam patterns to stabilise melt pools and enhance part integrity in laser‐based additive manufacturing.
Laser Beam Shaping in Additive Manufacturing Systems publication trend
The graph below shows the total number of articles in laser beam shaping in additive manufacturing systems across all publications each year (not limited to Nature Index journals).
Technical terms
Beam shaping: The process of modifying a laser’s spatial intensity distribution to achieve a desired energy profile on the workpiece.
Gaussian beam: A beam with intensity highest at its centre and decaying in a bell-shaped curve, typical of many laser resonators.
Top-hat profile: A beam with a uniform intensity plateau across its cross-section, providing even heat input over a defined area.
Ring-shaped beam profile: A doughnut-like intensity distribution, concentrating energy in an annular region to influence melt-pool flow and solidification.
Melt pool: The region of molten material created by laser irradiation during additive manufacturing, whose shape and dynamics determine solidified microstructure.
Keyhole: A vapour‐filled cavity in deep-penetration laser processing, whose stability is critical to pore formation and material integrity.
Powder bed fusion: An additive manufacturing process in which a laser selectively fuses powder particles layer by layer to build a part.
References
- Laser beam shape optimization in powder bed fusion of metals. Additive Manufacturing (2023).
- High frequency beam oscillation keyhole dynamics in laser melting revealed by in-situ x-ray imaging. Communications Materials (2023).
- Laser intensity profile as a means to steer microstructure of deposited tracks in Directed Energy Deposition. Materials & Design (2023).
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