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         "abstract": "During deep penetration laser welding a plume of hot metal vapor and particles is ejected by the keyhole. This vapor plume interacts with the incident laser beam by the means of scattering, absorption and phase front deformation. Within this work we present a measurement setup for diagnostics of the interaction characteristics. The setup combines a high-speed video with the measurement of the emitted spectrum of the vapor plume. This allows the location and differentiation between different zones of interaction between the laser beam and the plume. This knowledge will assist in the avoidance of weld defects which are induced by the vapor plume.",
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         "abstract": "During deep penetration laser welding a plume of hot metal vapor and particles is ejected by the keyhole. This vapor plume interacts with the incident laser beam by the means of scattering, absorption and phase front deformation. Within this work we present a measurement setup for diagnostics of the interaction characteristics. The setup combines a high-speed video with the measurement of the emitted spectrum of the vapor plume. This allows the location and differentiation between different zones of interaction between the laser beam and the plume. This knowledge will assist in the avoidance of weld defects which are induced by the vapor plume.",
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         "abstract": "The keyhole produced during deep penetration laser welding emits a plume of hot metal vapor and particles. The interaction\r\nbetween the plume and the incident laser beam results in beam scattering, absorption, and phase front deformation. The\r\ncombination of scattering and absorption leads to a partial extinction of the laser beam, while the phase front deformation\r\nadversely effects the beam quality. In this study we present a measurement setup which allows for diagnostics of the beam\r\ncharacteristics after interaction with the plume. This is achieved by utilizing an additional measurement beam, which is\r\ncoaxially aligned to the high-power laser beam used for welding. The experimental procedure presented here enables highfrequency\r\nmeasurements of the caustic changes and relative power losses of the measurement beam. The measurements\r\nobtained provide a quantification of the various interaction mechanisms between the laser beam and vapor plume. This\r\nknowledge is crucial to prevent weld defects, which result from the adverse effects of the vapor plume on the laser beam.",
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         "volume": "12878","abstract": "The keyhole produced during deep penetration laser welding emits a plume of hot metal vapor and particles. The interaction\r\nbetween the plume and the incident laser beam results in beam scattering, absorption, and phase front deformation. The\r\ncombination of scattering and absorption leads to a partial extinction of the laser beam, while the phase front deformation\r\nadversely effects the beam quality. In this study we present a measurement setup which allows for diagnostics of the beam\r\ncharacteristics after interaction with the plume. This is achieved by utilizing an additional measurement beam, which is\r\ncoaxially aligned to the high-power laser beam used for welding. The experimental procedure presented here enables highfrequency\r\nmeasurements of the caustic changes and relative power losses of the measurement beam. The measurements\r\nobtained provide a quantification of the various interaction mechanisms between the laser beam and vapor plume. This\r\nknowledge is crucial to prevent weld defects, which result from the adverse effects of the vapor plume on the laser beam.",
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