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软X射线检测是激光等离子体诊断中最复杂而又最重要的一项工作.该文简要介绍了带有前置光学系统的软X射线大面积透射光栅光谱仪和用它获得的铝和铜靶激光等离子体的光谱图“,”A novel diffraction spectroscopic instrument consisting of a large area transmission grating and a grazing incidence pre optics comprising of a toroidal mirror,a slit and a cylindrical mirror has been implemented.A nearly perfect stigmatism and a medium spectral resolution are due to the separation of the focusing and dispersing function.The experimental results show that it is possible to construct large area transmission grating spectrograph with high collecting efficiency and good spatial resolution.