计算并分析了离散角对有效二阶非线性系数和倍频效率的影响。
The influences of walk-off Angle on effective second-order nonlinear coefficient and SHG efficiency were also analyzed.
为改进网络学习效率及大范围收敛性，提出了网络权值学习的单调同伦方法，该方法具有与牛顿法相同的二阶收敛性。
To improve the learning efficiency and global convergence we present the monotone homotopy method, which has the same convergence as the Newton's method, to train the weights of the network.
苯基脲具有很强的二阶非线性光学效应，其粉末二次谐波产生效率为尿素的11倍；
A primary study was carried out and the results revealed that phenylurea had fairly strong nonlinearity, its powder second harmonic generation efficiency was 11 times larger than that of urea.
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