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将克尔介质等效为时域二次折射率介质的基础上，考虑折射率系数随传播变化的情况，得到了激光脉冲在克尔介质中传播时近似的解析描述。
Based on the fact that the Kerr medium is equivalent to the time-domain second-order refractive index medium and the refractive index coefficient changes with propagation, an approximation of the laser pulse propagation in Kerr medium is obtained.