光谱学基本上是一种研究光谱和光谱线的学科，特别对我们来说，是研究恒星发出的光。

Spectroscopy is basically the study of spectra and spectral lines of light, and specifically for us, the light from stars.

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为了获得更加清晰的光谱线，他们成功发现了非线性方法像磁性饱和和双光子光谱学。

Tomget sharper spectral lines, they started by successfully developing nonlinear methods such as saturation or two-photon spectroscopy.

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以矩形谱线的光源为例，计算了时间相干度，简要介绍了傅里叶变换光谱学原理。

The author takes light source of the rectangle optical spectrum as an example to calculate time relevant degree and briefly describes Fourier's spectroscopy principle.

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So these names, they don't really make any sense why they're called past s p and f, and it turns out that it comes from spectroscopy terms that are pre-quantum mechanics where, for example, this is called the sharp line, I think the principle, the diffuse, and the fundamental.

看到这些名字，你会发现,它们为什么叫s，p，f是没什么道理的，事实上,它们来源于,量子力学之前的光谱学中的术语，例如，它们分别叫做锐线，我认为是主线，漫射和基本。

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