Energy loss in focal spot by CO2 laser mitigation treatment
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摘要: 利用模拟美国国家点火装置（NIF）终端光学组件光路排布的检测平台，测试了熔石英光学元件表面不同尺寸、不同密度修复坑对光束焦斑能量所造成的影响。实验结果表明，在修复坑密度较小时，能量损失率和修复坑密度呈线性相关，密度达到一定值后则达到饱和，修复坑尺寸对能量损失率随密度的增长速度造成影响，修复坑尺寸越大，能量损失率随密度的增长越快。按照NIF装置3%束间功率平衡的技术指标，要求修复坑密度必须控制在2 cm-2以下。Abstract: An experimental setup referring to the optical element configuration of National Ignition Facility was built. The energy loss from mitigation cone by CO2 laser was tested. The results showed that the loss ratio had a linear correlation with the density of mitigation cone while the density was low. The energy would lose faster with the increase of density if the mitigation cone was larger. Density of mitigation cone must be small than 2 cm-2 to ensure the loss ratio less than 3%.
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Key words:
- CO2 laser /
- fused silica /
- mitigation /
- energy loss /
- focal spot
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