M.M. Vogel

Publications (2)0 Total impact

• Conference Proceeding: Very large area single-mode multi-core fiber

  M.M. Vogel, M. Abdou-Ahmed, A. Voss, T. Graf
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  ABSTRACT: A comparison of experimental and theoretical results for the bending sensitivity of our MCF is shown. In conclusion and to the best of our knowledge, this is the first report on a very large mode-area "truly" single-mode evanescent-field coupled multi-core fiber with acceptable bending sensitivity. The shown results clearly demonstrate the suitability of the proposed fiber for high-power beam delivery systems.
  Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on; 07/2009
• Conference Proceeding: A 1-kW radially polarized thin-disk laser

  M.A. Ahmed, M.M. Vogel, A. Voss, T. Graf
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  ABSTRACT: In the present paper two techniques which were applied to high power Yb:YAG thin-disk laser systems for the generation of radially polarized beams is discussed. In the first approach, the rear mirror of a two-disk laser system was replaced by a polarization selective grating mirror. The polarizing effect of this element is achieved by a waveguide coupling mechanism which leads to a reduction of the reflection coefficient of the undesired polarization state. The second approach is based on an extra-cavity linear-to-radial polarization converter. The LRPC was tested by directing the collimated beam of a fiber-coupled high-power thin-disk laser linearly polarized by a conventional thin-film polarizer onto the element. The design, characterization as well as the laser operation tests of the intracavity polarizing grating mirror and of the linear-to-radial polarization converter is discussed.
  Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on; 07/2009