The proposing team that works at CNR ISTEC has recently patented a technology for the production of the Smart Polycrystals (SP), i.e. transparent YAG-based ceramic polycrystals (Y3Al5O12) variably doped with rare earths ions and transition metals ions. The SPs solve the problem of the reduction of the efficiency in the solid state laser systems caused by the inhomogeneous heating of the single crystals during the emission process. By replacing the single crystals with the SPs, we drastically reduce these thermal effects. Thanks to an innovative additive manufacturing process, we can obtain the defect-free microstructures needed for the transparency, as well as layered or graded distributions of the dopant needed for the heating control. SPs have reached a TRL 4, validation in laboratory. The patent is owned by CNR and protects the product and process.
The Smart Polycrystals (SPs) can be produced at a fraction of the production costs of single crystals, and with complex structures and a designed dopant distribution. This competitive advantage meets specific application needs to increase performance, which are currently unsatisfied due to the lack of techniques that go beyond the creation of simple double layered components. An additional advantage is the reduced environment impact of the production process, that leads also to an additional cost reduction. The process temperatures are lower and the process duration is shorter than those needed for the production of single crystals. The SPs are near-net-shape with limited production waste, and can be designed and produced in a way that allows to regenerate them at the end of their life, according to the criteria of the circular economy. Finally, 3D printing allows components to be miniaturized with further savings in raw materials.
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