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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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