Calibration of a high harmonic spectrometer by laser induced plasma emission
Calibration of a high harmonic spectrometer by laser induced plasma emission
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DOI：
10.1364/oe.17.015134
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发表时间：
2009-08-17
期刊：
影响因子：
3.8
通讯作者：
Guehr, M.
中科院分区：
文献类型：
--
作者：
Farrell, J. P.;McFarland, B. K.;Guehr, M.
我们提出了一种方法，可以方便地切换高谐波产生（HHG）和精确校准用于分析谐波光谱的真空紫外（VUV）光谱仪。HHG光谱的精确定标对于电子结构的测定变得越来越重要。激光谐波的波长本身取决于谐波几何形状和相位匹配的细节，因此不适合用于校准目的。在我们的校准模式中，目标直接位于激光的焦点处，从而增强了等离子体发射，抑制了谐波的产生。在HHG模式下，源介质位于焦点的前面或后面，显示出增强的HHG，没有等离子体发射线。我们分析了等离子体发射并将其用于HHG光谱的直接校准。(C) 2009年美国光学学会
We present a method that allows for a convenient switching between high harmonic generation (HHG) and accurate calibration of the vacuum ultraviolet (VUV) spectrometer used to analyze the harmonic spectrum. The accurate calibration of HHG spectra is becoming increasingly important for the determination of electronic structures. The wavelength of the laser harmonics themselves depend on the details of the harmonic geometry and phase matching, making them unsuitable for calibration purposes. In our calibration mode, the target resides directly at the focus of the laser, thereby enhancing plasma emission and suppressing harmonic generation. In HHG mode, the source medium resides in front or after the focus, showing enhanced HHG and no plasma emission lines. We analyze the plasma emission and use it for a direct calibration of our HHG spectra. (C) 2009 Optical Society of America