Static Fourier transform spectrometers (S-FTSs) are well-consolidated instruments providing high throughput and high spectral resolution in a narrow spectral band. They use two reflective gratings as dispersive elements in a Michelson interferometer. Gratings allow high spectral dispersion and consequently high resolution, but, due to the light diffused from their grooves, they are one of the main noise sources in the reconstructed spectrum. In this work, we compare the signal-to-noise ratio performance of a prism-based S-FTS with that of a grating-based S-FTS. As a primary advantage, prisms give intrinsically lower diffused light than gratings. Furthermore, they do not have multiple diffracted orders, reducing thereafter the optical constraints on the instrumental baffling.

中文翻译：

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高灵敏度静态傅立叶变换光谱仪

静态傅立叶变换光谱仪（S-FTSs）是整合良好的仪器，可在狭窄的光谱带中提供高通量和高光谱分辨率。他们在迈克尔逊干涉仪中使用两个反射光栅作为色散元件。光栅可以实现较高的光谱色散，因此可以实现较高的分辨率，但是由于从凹槽中散射的光，光栅是重构光谱中的主要噪声源之一。在这项工作中，我们比较了基于棱镜的S-FTS和基于光栅的S-FTS的信噪比性能。棱镜的主要优点是，与光栅相比，棱镜本质上具有较低的散射光。而且，它们不具有多个衍射级，此后减小了对仪器挡板的光学约束。