Gaussian beam is the asymptotic solution of wave equation concentred at the central ray.
高斯束是波动方程在特定射线附近的高频渐近解。
Using the perturbative method the asymptotic solution of the corresponding model is obtained.
利用摄动方法求出了相应模式的渐近解。
For every order of the asymptotic solution, the dimensionality of the problem has been decreased by one.
使问题的维数，对各级渐近解而言，降低了一维。
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