因此，窄带脉冲光束可以采用复振幅包络和复解析信号两种表示式来研究，而对于宽带脉冲光束，必须采用严格的复解析信号表示式。
It is concluded that both of the representations are applicable to study narrowband pulse, but for broadband pulse only rigorous complex analytical signal representation should be adopted.
能流密度不再随时间作简谐振荡，它的振幅构成一个高斯形状的包络。
The instantaneous energy density does not oscillate with time at the harmonic form, its amplitude forms and envelope with Gaussian shape.
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