摘要
飞秒激光作用于等离子体可以产生短脉宽、高亮度的极紫外(EUV)辐射,在高分辨率成像、时间分辨谱学等方面都有潜在的应用。为进一步提高辐射亮度,利用相对论飞秒激光与碳纳米管泡沫(CNF)靶相互作用实现了高转换效率的EUV辐射。实验结果表明,当激光能量为1.2 J,CNF密度为4 mg/cm^(3)时,单发产生的EUV辐射光谱强度在0.1 mJ·nm^(-1)·sr^(-1)量级。相比高密度固体靶,采用低密度CNF靶可以有效地提高激光吸收率,进而实现两个量级的EUV辐射效率增益。同时发现,基于CNF的EUV辐射在15~30 nm波长范围内具有准连续的宽谱特征,适合于超快吸收光谱等应用。
The interaction of femtosecond laser with plasmas can produce ultrashort and brilliant extreme-ultraviolet(EUV)radiations,which can be applied in high-resolution imaging and time-resolved spectroscopy.To further improve the radiance,the high-efficiency generation of EUV radiations from carbon nanotube foam(CNF)targets irradiated by a relativistic femtosecond laser is demonstrated.The experimental result indicates that when the laser energy is 1.2 J and the CNF density is 4 mg/cm^(3),the single-shot EUV spectrum intensity is around 0.1 mJ·nm^(-1)·sr^(-1).Compared with high-density solid targets,the low-density CNF targets can effectively improve laser absorptivity,and therefore realize an enhancement of EUV conversion efficiency by two orders of magnitudes.Furthermore,the EUV radiations from CNFs are quasi-continuum in the wavelength range of 15--30 nm,which is suitable for applications including ultrafast absorption spectroscopy.
作者
寿寅任
潘卓
曹正轩
王大辉
王鹏杰
刘建波
梅竹松
孔德锋
赵研英
颜学庆
马文君
Shou Yinren;Pan Zhuo;Cao Zhengxuan;Wang Dahui;Wang Pengjie;Liu Jianbo;Mei Zhusong;Kong Defeng;Zhao Yanying;Yan Xueqing;Ma Wenjun(State Key Laboratory of Nuclear Physics and Technology,Peking University,Beijing 100871,China;State Key Laboratory of Laser Interaction with Matter,Northwest Institute of Nuclear Technology,Xi'an 710024,Shaanxi China;Beijing Laser Acceleration Innovation Center,Beijing 101407,China;Center for Applied Physics and Technology,Peking University,Beijing 100871,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2022年第11期249-255,共7页
Acta Optica Sinica
基金
国家重点研发计划(2019YFF01014402)
国家自然科学基金创新研究群体科学基金(11921006)。
关键词
X射线光学
极紫外辐射
飞秒激光
碳纳米管泡沫
宽谱辐射
X-ray optics
extreme-ultraviolet radiation
femtosecond laser
carbon nanotube foams
continuum radiation
