二次谐波振荡 meaning in English

secondary harmonic generation

The first order nonlinear hyperpolarizabilities in second - harmonic generation process and electro - optical pockels effect are computed . the basis set effects in ab - mitio quantum - chemical computation are mainly studied . the correction to the nonlinear optical properties due to the electronic correlation energy is discussed and the relationship between the first order hyperpolarizabilities and the frequencies of the external electric field is also investigated
计算了二次谐波振荡过程和电光pockels效应过程的一阶非线性超极化率，研究了电子的相关能对pna分子的非线性光学性质的影响以及pna分子的一阶非线性超极化率与外加光电场频率之间的色散关系，并着重讨论了量子化学从头计算中基矢组的选取对计算结果的影响。
Secondly , the nonlinear optical properties with pna molecule in different solvents are studied through using the polarized continuum model and few states approach on the base of time dependent density functional theory , and the first order nonlinear hyperpolarizabilities in second harmonic generation process are computed
然后在含时密度泛函理论基础上采用极化连续模型和少态方法研究了不同溶剂中pna分子的非线性光学性质，计算了二次谐波振荡过程的一阶非线性超极化率，并讨论了pna分子的非线性光学性质与溶剂极性之间的关系。