Selective Laser-induced Etching (SLE) is a laser-based process which enables the fabrication of three-dimensional parts from transparent materials with an enormous freedom of geometry and micrometer precision. A current research focus for the SLE process is the development and fabrication of ion traps made of fused silica for the ion-based approach of quantum computing. With the help of micrometer-sized electrically controllable components, ions are trapped inside an electrical field and their state is manipulated by means of laser radiation in the context of complex computing operations. Another research focus is the fabrication of fiber-chip couplers which are necessary components of smallest laser sources with the purpose to minimize and simplify the current complex experimental setup of a quantum computer. This work presents the current development of laser / SLE-based processes for the fabrication of microelectronic devices and quantum computing applications.
Laser Metal Deposition (LMD) is a high deposition rate metal Additive Manufacturing process. Its applications are basically repair, cladding and manufacturing. The two most commonly used LMD processes are powder-based (LMD-p) and wire-based (LMD-w). Despite the fact that wire-based LMD is more material efficient, process stability is a major concern. By adding a modulated laser beam to the continuous process beam, a change of the melt pool geometry and increased energy absorption are observed. This relation shows great potential to increase process stability. In this contribution, the positive effect of the dual laser-beam use on LMD-w processes is demonstrated. To understand the cause-effect relation, the workpiece temperature field was investigated by optical backscatter reflectometry (OBR). The results were then correlated to simultaneously performed IR camera measurements of the workpiece’s upper surface. By better understanding the thermal phenomena in dual-beam LMD, research can improve process temperature control. This leads to a new perspective for the LMD-w manufacturing process in many industry sectors such as mobility, energy and engineering.
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