Symmetrization of astigmatic high power diode laser stacks |
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Authors: | Gao C Laabs H Weber H Brand T Kugler N |
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Institution: | (1) Optical Institute, Technical University of Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany;(2) Beijing Institute of Technology, Beijing, People's Republic of China (;(3) Laser- und Medizin-Technologie gGmbH, Rudower Chaussee 6, 12489 Berlin, Germany |
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Abstract: | The astigmatic high power diode laser beam emitted from a two-dimensional stacked array is transformed into a beam with rotational symmetry. The symmetrization optic is a first order optical system consisting of a bifocal telescope and three rotated cylindrical lenses. The symmetrized beam has equal beam radii, far field divergence, and waist positions in x, y directions. Additionally a twist appears. The beam parameter product of the symmetrized beam is the average of the beam parameter products of the input astigmatic beam along x-, y-axes. The twist arises from the astigmatism of the original beam. The theoretical calculations are confirmed by the experiments. |
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Keywords: | beam symmetrization high power diode laser beam twist |
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