The Fourier spectral analysis method is applied to the input-output coupling problem of a prism-thin film waveguide system. The input-output coupling equations are solved fast and exactly.
把傅里叶频谱分析方法引入棱镜-薄膜波导耦合系统的输入输出耦合问题，快速而完整地求解了系统输入输出耦合方程组。
Discrete fast Fourier transform (FFT) has been widely applied to signal spectral analysis and can figure out the entire bandwidth spectrum of a signal.
离散快速傅里叶变换算法在频谱分析中得到了广泛的应用，这种算法得到的计算结果是在整个频段上的频谱信息。
The use of Fourier analysis techniques to measure the wavefront power spectral density (PSD) in mid frequency domain is discussed.
波前功率谱密度 （PSD）被用于评价惯性约束聚变激光驱动器光学元件在中频区域的波前误差。
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