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理论上非线性光学效应的产生是激光场与非线性介质的原子、分子相互作用的结果,用微扰结合密度矩阵理论可导出分子的二阶
In theory, the nonlinear optical effect is the result of the interaction between the atoms and molecules in the laser field and the nonlinear medium. Using the perturbation density matrix theory, the second-order