氩离子的亮准相位匹配软X射线谐波辐射
Bright quasi-phasematched soft x-ray harmonic radiation from Argon ions
摘要:
实验证明了在充氩气的直孔毛细管波导中产生的延伸到水窗(~ 4 nm)的谐波的选择性增强(>10^3)。这种增强是在良好的协议与建模表明,多模准相位匹配(MMQPM)是通过快速的轴向强度调制所造成的基本和高阶毛细管模式之间的拍频。首次从氩离子中观测到了波长超过碳K边(~4.37nm,~ 284 eV)直到~ 360 eV的大量脉冲能量(每个谐波阶次每脉冲> 10 nJ)。
英文摘要:
Selective enhancement (>10^3) of harmonics extending to the water window (~4nm) generated in an argon gas filled straight bore capillary waveguide is demonstrated. This enhancement is in good agreement with modeling which indicates that multimode quasi-phasematching (MMQPM) is achieved by rapid axial intensity modulations caused by beating between the fundamental and higher order capillary modes. Substantial pulse-energies (>10nJ per pulse per harmonic order) at wavelengths beyond the carbon K-edge (~4.37nm, ~284eV) up to ~360eV are observed from argon ions for the first time.
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