本文介绍计算双轴晶体二阶有效非线性系数的严格理论，适用于双轴晶体非线性光学频率变换器件的设计。
We present an accurate route, which is suitable for the design of nonlinear optical frequency translator of biaxial crystals, to calculate the effective second-order nonlinear coefficients.
本文以偏硼酸钡晶体为例，分析了三个光波的二阶非线性相互作用，并推导单轴晶体的有效非线性系数的表达式。
The second order nonlinear optical effects on the three-wave is analyzed, and the nonlinear optical coefficient of the uniaxial crystal is deduced from an example of the BBO.
对BBO晶体的材料特性，有效非线性系数，以及BBO晶体的走离角与空间走离效应，群速度失配与时间走离效应进行了讨论。
The properties of nonlinear crystal BBO is presented. The walk-off Angle and the spatial walk-off effect, the group velocity mismatch and the temporal walk-off effect are discussed.
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.
考虑到离散角的影响，给出了单轴晶体中有效非线性极化系数的精确计算公式，并给出了计算举例。
Considering the effect of walk-off Angle, the accurate calculation of effective nonlinear optical coefficient of uniaxial crystal is presented, a example of calculation of BBO is given.
根据抽水试验观测资料，提出了土体渗透系数与有效应力的非线性耦合响应模型。
Based on Biots consolidation theory, the fully coupling model of seepage and stress is established considering nonlinear coupling response of permeability coefficient.
根据抽水试验观测资料，提出了土体渗透系数与有效应力的非线性耦合响应模型。
Based on Biots consolidation theory, the fully coupling model of seepage and stress is established considering nonlinear coupling response of permeability coefficient.
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