强激光与粒子束2025，Vol.37Issue(5)：52-66,15.DOI:10.11884/HPLPB202537.240327
激光焦斑尺寸对极紫外辐射影响的理论研究
Theoretical investigation into effect of laser focal spot size on extreme ultraviolet radiation
摘要
Abstract
To understand the effect of laser focal spot size on the extreme ultraviolet conversion efficiency and the physical mechanism that produces the effect,we developed a two-dimensional transient expansion model of laser ablation of planar target to produce coronal plasma by means of theoretical analysis.It is found that under condition with light intensity of 7.45×1010 W/cm2,full width at half maxima of 5 ns,wavelength of 1064 nm,as the laser focal spot radius increases from 60 μm to 300 μm,the corresponding extreme ultraviolet conversion efficiency increases from 1%to 5.5%,while the corresponding extreme ultraviolet conversion efficiency stays at 5.5%after the focal spot radius is larger than 300 μm.This is due to the fact that the plasma in the coronal region generated by laser ablation of planar targets expands from the initial one-dimensional expansion to the subsequent two-dimensional expansion,which determines the saturation size of the plasma region emitting extreme ultraviolet light and ultimately determines the conversion efficiency of the extreme ultraviolet light.Our theoretical analysis on trend of conversion efficiency with focal spot radius can explain the physical phenomena observed in the laser ablation of a tin target experiment.关键词
激光等离子体/极紫外辐射/激光焦斑尺寸/理论解析/二维膨胀Key words
laser produced plasma/extreme ultraviolet radiation/laser focal spot size/theoretical analysis/two-dimensional expansion分类
物理学引用本文复制引用
蓝翔,李学成,杨顺熠,唐桧波,况龙钰,胡广月..激光焦斑尺寸对极紫外辐射影响的理论研究[J].强激光与粒子束,2025,37(5):52-66,15.基金项目
国家自然科学基金项目(12175230,11775223,12205298) （12175230,11775223,12205298）
中国科学院战略先导专项项目(XDB16) （XDB16）
统筹推进世界一流大学和一流学科建设专项资金资助项目(YD2140002006) （YD2140002006）
