Additive Manufacturing of Lightweight Optical Systems

Additive manufacturing has transformed the design and production of optical components by enabling the direct fabrication of complex, lightweight structures that were previously unachievable with conventional subtractive techniques. By building parts layer by layer, researchers can integrate optimised lattices, topology-optimised frameworks and biomimetic geometries into mirrors, lenses and supporting assemblies. These innovations not only reduce mass—vital for aerospace, satellite and unmanned systems—but also enhance stiffness, thermal stability and structural efficiency. Commonly employed materials include aluminium alloys such as AlSi10Mg and ceramic composites like silicon carbide, each selected to balance optical performance with mechanical and thermal properties. Advanced post-processing methods, including single-point diamond turning and precision polishing, yield surfaces with nanometre-scale roughness and sub-micrometre form accuracy. Finite element analysis guides both the design and validation stages, ensuring that resonance frequencies and deformation under operational loads meet stringent optical requirements. The integration of additive manufacturing into optical system development is fostering more compact, high-performance instruments for applications ranging from deep-space telescopes to airborne lidar, heralding a new era of agile and cost-effective optical engineering.

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Additive Manufacturing of Lightweight Optical Systems publication trend

The graph below shows the total number of articles in additive manufacturing of lightweight optical systems across all publications each year (not limited to Nature Index journals).

Technical terms

Additive manufacturing (AM): A process of building components layer by layer directly from digital models, allowing intricate geometries and internal structures.

Topology optimisation: A computational design method that distributes material within a given volume to maximise stiffness and minimise weight under specified load conditions.

Lattice structure: A periodic network of struts or cells incorporated into a component to reduce mass while maintaining mechanical strength and stiffness.

Single-point diamond turning (SPDT): An ultra-precision machining technique using a diamond-tipped tool to achieve nanometre-scale surface finishes on optical materials.

Modulation transfer function (MTF): A metric describing an optical system’s ability to reproduce contrast at different spatial frequencies, indicative of resolution performance.

Laser powder bed fusion (LPBF): An additive manufacturing modality wherein a laser selectively melts metal powder layers to form dense parts with complex geometries.

References

1. Design and Fabrication Technology of Metal Mirrors Based on Additive Manufacturing: A Review. Applied Sciences (2021).
2. Lightweight and High-Stiffness Metal Optical Systems Based on Additive Manufacturing. Micromachines (2024).
3. Elimination of surface/subsurface defects on additively manufactured AlSi10Mg mirrors through nano-second laser irradiation.. Optics Express (2023).