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6 February 2012 Controlling the thermally induced focal shift in laser processing heads
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A system being able to in situ measure and control not simply the distance between the workpiece and the focusing optics, but the true focal position on the workpiece including the thermally induced focal shift in a laser processing head is presented. In order to achieve this, a bundle of astigmatic measurement beams is used following the same optical path as the welding beam. A camera and a software algorithm allow to keep the focal position constant within a range of 4 mm and with a resolution between 150 μm and 500 μm.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jan-Philipp Negel, Felix Abt, David Blázquez-Sánchez, Armin Austerschulte, Margit Hafner, Thomas Liebig, Philipp von Strobl-Albeg, Rudolf Weber, Marwan Abdou Ahmed, Andreas Voss, and Thomas Graf "Controlling the thermally induced focal shift in laser processing heads", Proc. SPIE 8239, High Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications, 823911 (6 February 2012);

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