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2011
Conference Paper
Title

New sputtering concept for optical precision coatings

Abstract
The deposition of optical precision coatings on glass by magnetron sputtering is still a challenging problem regarding particle density and long term stability of coating plants due to target material erosion. A novel approach to increase process stability and reduce drifts is the usage of cylindrical cathodes. These cathodes allow a particle free deposition process as they have virtually no redeposition zones that can lead to destruction of coatings by arcing caused by surface charges. In the present paper optical single layers as well as multilayer coatings were sputtered by means of reactive magnetron sputtering using a double cylindrical cathode setup. The particle density is determined and compared to particles produced with planar magnetrons. A new sputter coater concept will be presented wherein the magnetrons are attached to a rotating disc coater in a sputter-up configuration. The process was stabilized by means of oxygen partial pressure control. Preliminary optical properties as well as deposition rates of different oxide films will be presented.
Author(s)
Rademacher, D.
Bräuer, G.
Vergöhl, M.
Fritz, B.
Zickenrott, T.
Mainwork
Advances in Optical Thin Films IV  
Conference
Conference "Advances in Optical Thin Films" 2011  
DOI
10.1117/12.896843
Language
English
Fraunhofer-Institut für Schicht- und Oberflächentechnik IST  
Keyword(s)
  • new sputter concept

  • optical coatings

  • magnetron sputtering

  • cylindrical targets

  • particles

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