Polarisationsmodulation eines Lasers mit photoelastischem Kristall
From the coating of electronic or pharmaceutical products to thin plastic films - a new technique developed by TU Wien enables coating processes to be quality controlled in real time. When covering large areas with very thin layers of exactly the right thickness in the micrometre or nanometre range, it is easy to make mistakes. In many cases, the thickness of the applied layer can only be measured once the coating process is complete. With a few technical tricks, however, a research team at TU Wien has now successfully developed a device which can be installed directly into coating systems and facilitates reliable quality control during operation. This device - the inline ellipsometer - is being presented to the public for the first time at the Hannover Messe trade fair. Constantly under fire with laser pulses - "The basic principle is easy," explains Ferdinand Bammer from the Institute for Production Engineering and Laser Technology at TU Wien. "The surface is illuminated using a laser beam.
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