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微分法是软Ｘ光波段唯一精确计算衍射光栅效率的电磁理论。应用这种理论成功地设计出带有位相光栅的软互光激光反射输出镜，计算出可能的实验误差。对微分理论的数值结果和精度进行了分析和讨论。
The differential method is the only electromagnetic theory that accurately calculates the diffraction grating efficiency in the soft X-ray band. Using this theory, a soft-reflected laser output mirror with phase grating was successfully designed and a possible experimental error was calculated. The numerical results and precision of differential theory are analyzed and discussed.