j**t
发帖数: 301 | 1 傅立叶分析的前提是系统传递函数的频率特性为线性，从而可以进行线性叠加（傅立叶分
析实际上是线性叠加的连续形式）。而对于非线性（光学）过程来说，
等效的系统传递函数频率特性实际上是非线性的，不同的频率会混合（和、差、倍等），
线性叠加不再适用。 | c*******o
发帖数: 1722 | 2 to use the Fourier transformation to sovle the differential Eqn, you can
get the system transform function. this is mathematically equivalent to
assume exp(i \omega t) dependence. so, it takes care of only the linear
response. it does not give you anything from nonlinearity.
as for 光刻, it probably use high intensity lasers, which will interact
with the material. that is where the nonlinearity kicks in. for weak
nonlinearity, you can taylor expand the \kai (susceptibility). for strong
nonlinearit |
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