In the process of optimization, the gradient computation of the energy function with respect to optical parameters is critical, for which, an algorithm based on the gradient tree is put forward.

优化过程中，能量函数关于光学参数的梯度计算是关键，本文提出一种基于梯度树的梯度求解方法。

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Gauss interpolation realized the fine focusing nearby the peak of focusing curve based on the gradient energy function.

利用梯度平方函数高斯插值实现在峰值附近的精确调焦。

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The energy equation is solved by the zonal method, and the inverse radiation problem is solved through the minimization of performance function with the conjugated gradient method.

采用段法(区域法)求解正问题，反演中采用求目标函数极小值的共轭梯度法。

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