| Experimental Research on the Influence of Laser-induced Plasma on the Beam Focusing During High-power CO_2 Laser Materials Processing |
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| 引用本文： | XIAO Rongshi 1 ZUO Tiechuan 1 R. Volz 2 ( 1 National Center of Laser Technology,Beijing Polytechnic University,Beijing 100022,China 2 Institute of Technical Physics,German Aerospace Research Establishment,70569 Stuttgart,Germany). Experimental Research on the Influence of Laser-induced Plasma on the Beam Focusing During High-power CO_2 Laser Materials Processing[J]. Chinese Journal of Lasers, 1998, 7(6): 550-554 |
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| 作者姓名： | XIAO Rongshi 1 ZUO Tiechuan 1 R. Volz 2 ( 1 National Center of Laser Technology Beijing Polytechnic University Beijing 100022 China 2 Institute of Technical Physics German Aerospace Research Establishment 70569 Stuttgart Germany) |
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| 作者单位： | 1 National Center of Laser Technology，Beijing Polytechnic University，Beijing 100022，China 2 Institute of Technical Physics，German Aerospace Research Establishment，70569 Stuttgart，Germany |
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| 基金项目： | Supported by The National Nature Science Foundation of China under grant No. 69478013, the Federal Minstry of Education, Science, Research and Technology of Germany. |
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| 摘 要： | １ＩｎｔｒｏｄｕｃｔｉｏｎＩｔｉｓｗｅｌｋｎｏｗｎｔｈａｔｔｈｅｓｏｃａｌｅｄｌａｓｅｒｉｎｄｕｃｅｄｐｌａｓｍａｇｅｎｅｒａｔｅｓｄｕｒｉｎｇｈｉｇｈｐｏｗｅｒＣＯ２ｌａｓｅｒｍａｔｅｒｉａｌｓｐｒｏｃｅｓｉｎｇ．Ｓｉｎｃｅｔｈｅｐｌａｓｍａｓ...
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| 收稿时间： | 1998-04-06 |
Experimental Research on the Influence of Laser induced Plasma on the Beam Focusing During High power CO 2 Laser Materials Processing |
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| XIAO Rongshi ZUO Tiechuan R. Volz. Experimental Research on the Influence of Laser induced Plasma on the Beam Focusing During High power CO 2 Laser Materials Processing[J]. 中国激光(英文版), 1998, 7(6): 550-554 |
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| Authors: | XIAO Rongshi ZUO Tiechuan R. Volz |
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| Affiliation: | XIAO Rongshi 1 ZUO Tiechuan 1 R. Volz 2 |
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| Abstract: | A experimental method was developed to verify the effect of plasma on the focused beam propagation according to the basic fact that the plasma sustains for a while even when the laser beam moves off the workpiece at high power. It is found that the focus spot enlarges and the position of the focus shifts due to the effects of the plasma. This “lensing effect” of the laser induced plasma becomes more serious with the increase of the distance of plasma propagation. It is concluded that the “lensing effect” of plasma, other than plasma absorption, is the main mechanismfor plasma shielding. Due to the “lensing effect”, the power density on the workpiece decreases seriously which causes the process to be interrupted. |
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| Keywords: | CO 2 laser materials processing plasma shielding lensing effect of plasma |
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