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We have developed and successfully demonstrated the "point projection absorption spectroscopy (hereafter abbreviated to PPAS)" technique to record keV X-ray absorption spectra in the coronal region of laser produced aluminum plasma which provides spatial information in the corona. Absorption spectrum of the Al Ⅻ 1s2-1s2p resonant line for time delays up to 250, 500 and 750 ps after the peak of the incident laser pulse have been observed. Analysis of an absorption spectrum should allow a high spatial resolution (< 25μm) history of the absorbing ion population density to be determined. The 1-D hydro-code JB19 has been used to simulate the experiment and the predictions are compared to the observations. Such comparison can be useful in validating parts of the codes used for gain prediction on recombination X-ray laser transitions. 相似文献
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在多束激光辐照靶的实验中,时间同步是十分重要的。我们用双光子荧光(TPF)法测量了六束钕玻璃高功率激光系统(6×10~(11)W)的时间同步。测量时间同步的光源是该激光系统中的主被动锁模Nd~(3+)∶YAG振荡器,脉宽是20ps。 相对辐照的二束激光的时间同步测量,采用了在靶位处放置一个四面通光的双光子荧光盒,而正交辐照的二束激光的时间同步测量,采用了在靶位处放置一个半透膜板和一个双光子荧光装置。时间同步测量简便、直观。 给出了用双光子荧光法测量时间同步的误差。两束激光相对辐照时,同步误差为4ps,两束激光正交辐照时,同步误差为5ps。六束激光时间同步误差为10ps。 相似文献
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