<正>在准相匹配及泵浦损耗的情况下,对光参量放大的耦合方程给出了近似解。近似解表明,耦合过程是周期性的振荡过程,振荡周期依赖于耦合系数及泵浦光的强度。近似解与数值计算的结果相吻合。

In condition of quasi-phase-matching,the coupling equations of optical parametrical amplification are solved approximately in this paper,where the depletion of pump is considered.Approximated solution implies that the coupling process oscillates periodically,and the period of oscillation depends on both the coupling coefficient and the pump intensity.The obtained results agree well with numerical simulation.