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Clarification of plume along laser axis above specimen

机译：沿着样本上方激光轴的羽毛澄清

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In order to clarify the effect of plume along laser axis on scattering and absorption which deteriorate laser power and its density to be reached onto specimen during laser welding, the space where plume forms between the laser processing head and the specimen was observed. The welding process by the processing laser (5 kW fiber laser: 1070 nm) with high power probe laser (0.5-10 kW disk laser: 1030 nm) irradiated from lateral direction was observed with synchronous high-speed video recording of color image, 1030 nm and 1070 nm band-limited monochrome images. As the observation results, laser scattering by ultrafine particles could be visualized by band-limited monochrome images. As emission of visual light along the high power probe laser was observed, it can be said that ultrafine particles were reheated or re-excited by the high power probe laser. Plume was categorized as primary plume ejected from keyhole and secondary plume which consists of the matter reheated or re-exited from ultrafine particles by processing laser along laser trajectory. Laser scattering distribution where stronger scattering at the outer boundary of laser axis and hollow cavity of scattering at the center of laser axis formed were observed. The existence of hollow cavity in the processing laser axis was also confirmed as the scattering of the high power probe laser was unseen there. Percentage graph of the relationship between laser irradiation power and laser extinction using the probe laser showed that the laser extinction decreases with an increase in laser power. From above results, it can be said that laser extinction is little, but the thermal lensing effect by the media at the space between the laser processing head and the specimen is not negligible.
机译：为了阐明沿着激光轴的散射和吸收的羽毛的效果，在激光焊接期间达到激光功率的散射和吸收，并且在激光焊接期间达到样品的密度，观察到激光加工头和样品之间的羽毛形式的空间。通过同步高速视频记录的彩色图像，1030，观察到从横向照射的高功率探针激光（5 kW光纤激光器：1070nm）的焊接工艺与从横向照射的高功率探针激光（0.5-10kW盘激光：1030nm）。 NM和1070nm带限制的单色图像。作为观察结果，通过带限量的单色图像可视化超细颗粒的激光散射。由于观察到沿着高功率探针激光器的视光发射，可以说，通过高功率探针激光重新加热或重新激发超细颗粒。羽毛被分类为从匙孔和二次羽流中喷射的主要羽流，其包括通过沿着激光轨迹的激光加工或从超细颗粒重新加热或重新引出的物质。观察激光散射分布，其中观察到在形成的激光轴外边界处的散射较强的散射和在形成的激光轴的中心处的散射处。还确认了加工激光轴中的中空腔的存在，因为高功率探针激光器的散射在那里看不见。使用探针激光激光照射功率和激光消光之间的关系的百分比图表明激光消光随着激光功率的增加而降低。从上面的结果中，可以说激光灭绝几乎没有，但是在激光加工头和样本之间的空间处的介质的热镜头效果不可忽略。

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