以下为句子列表：
英文: Abstract: Brief introduction to χ(2) cascading nonlinearities is presented.The enhancement mechanisms for optical Kerr effect and the photorefractive effect as χ(2) cascading process are discussed.Mutual inductance between quadric and cubic nonlinearities
中文: 文摘:介绍了χ(2)串级非线性.讨论了串级光克尔非线性和串级光折变非线性的增强机制，并指出二阶和三阶非线性的相互转化，为光学非线性工程设计提供了可行性.
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