Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Laser Assisted Assembly of Microoptical Components

Project Status: finished


For the coupling of optical fibers to optical chips or electro-optical components, laser assisted methods of joining should replace gluing. Alternative joining methods are relevant, because adhesive bonds tend towards degradation under the influence of temperature and moisture. Aim of this project is the fixation of optical fibers in silicon V-grooves. In the case of laser welding, a melt pool is created next to the fiber through the energy of a Nd:YAG-laser pulse. During solidification, the volume of silicon expands. A bump is formed, which clamps the fiber. For laser soldering it is necessary to metallize both, the V-grooved silicon submount and the silicon or silica cover plate. After the deposition of AuSn-solder, the silicon parts and the optical fibers are soldered with a Nd:YAG-laser. Fiber pulling tests have shown that the pulling force, which is needed for qualification, can be transferred from the fiber to the silicon submount. Further investigations are necessary to determine the resistance to moisture and thermal shock. In comparison with adhesive bonds, a rise in reliability of the soldered joint is expected.



    • Degner, J.; Herrmann, J.; Junker, F.; Berendt, E.; Merklein, M.:
      Leichtbauwerkstoffe für den modernen Automobilbau.
      Zeitschrift Konstruktion 3(2018), pp. 50-54

    Letztes Update: 28.04.2010