Frassetto Fabio, Cocola Lorenzo, Zuppella Paola, Deppo Vania Da, Poletto Luca
Opt Express. 2021 May 24;29(11):15906-15917. doi: 10.1364/OE.422645.
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.
静态傅里叶变换光谱仪（S-FTS）是性能成熟的仪器，可在窄光谱带内提供高吞吐量和高光谱分辨率。它们在迈克尔逊干涉仪中使用两个反射光栅作为色散元件。光栅可实现高光谱色散，从而实现高分辨率，但由于从其凹槽散射的光，它们是重建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。棱镜的一个主要优点是，其固有散射光比光栅低。此外，它们没有多个衍射级，从而减少了仪器遮光罩的光学限制。
