Telecentric lens has parallel chief ray with its optical axis and is ideal for co-axial lighting.
远心镜头拥有与它的光轴平行的主光线，同轴照明是非常理想的。
A similarity model describing the physics of slab target X ray lasers is constituted from the ideal hydrodynamic equations.
从等离子体的流体动力学方程出发，导出了描述激光辐照平板靶条件下产生x射线激光物理过程的自相似方程。
Natural light, scattering light and diffracted ray are removed effectively with those methods. Then, laser spot keeps stable, system precision is improved and an ideal result is obtained.
这些预处理方法有效地消除了自然光线、散射光线和衍射光线对系统的干扰，使激光光斑图像保持稳定，起到提高系统精度的作用，得到了较为理想的结果。
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