A monolithic spatial heterodyne Raman spectrometer (mSHRS) is described, where the optical components of the spectrometer are bonded to make a small, stable, one-piece structure. This builds on previous work, where we described bench top spatial heterodyne Raman spectrometers (SHRS), developed for planetary spacecraft and rovers. The SHRS is based on a fixed grating spatial heterodyne spectrometer (SHS) that offers high spectral resolution and high light throughput in a small footprint. The resolution of the SHS is not dependent on a slit, and high resolution can be realized without using long focal length dispersing optics since it is not a dispersive device. Thus, the SHS can be used as a component in a compact Raman spectrometer with high spectral resolution and a large spectral range using a standard 1024 element charge-coupled device. Since the resolution of the SHRS is not dependent on a long optical path, it is amenable to the use of monolithic construction techniques to make a compact and robust device. In this paper, we describe the use of two different monolithic SHSs (mSHSs), with Littrow wavelengths of 531.6 nm and 541.05 nm, each about 3.5 × 3.5 × 2.5 cm in size and weighing about 80 g, in a Raman spectrometer that provides ∼3500 cm−1 spectral range with 4–5 cm−1 and 8–9 cm−1 resolution, for 600 grooves/mm and 150 grooves/mm grating-based mSHS devices, respectively. In this proof of concept paper, the stability, spectral resolution, spectral range, and signal-to-noise ratio of the mSHRS spectrometers are compared to our bench top SHRS that uses free-standing optics, and signal to noise comparisons are also made to a Kaiser Holospec f/1.8 Raman spectrometer.

中文翻译：

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EXPRESS：单片空间外差拉曼光谱仪：初始测试

描述了一种单片空间外差拉曼光谱仪 (mSHRS)，其中光谱仪的光学组件结合在一起，形成一个小而稳定的整体结构。这建立在之前的工作的基础上，我们描述了为行星航天器和漫游车开发的台式空间外差拉曼光谱仪 (SHRS)。SHRS 以固定光栅空间外差光谱仪 (SHS) 为基础，可在较小的占地面积内提供高光谱分辨率和高光通量。SHS 的分辨率不依赖于狭缝，由于它不是色散装置，因此无需使用长焦距色散光学元件即可实现高分辨率。因此，SHS 可用作紧凑型拉曼光谱仪的组件，使用标准的 1024 元素电荷耦合器件，具有高光谱分辨率和大光谱范围。由于 SHRS 的分辨率不依赖于长光路，因此可以使用单片构造技术来制造紧凑而坚固的设备。在本文中，我们描述了在拉曼光谱仪中使用两种不同的单片 SHS (mSHS)，其 Littrow 波长为 531.6 nm 和 541.05 nm，每个尺寸约为 3.5 × 3.5 × 2.5 cm，重量约为 80 g，可提供~ 3500 cm-1 光谱范围，4-5 cm-1 和 8-9 cm-1 分辨率，分别适用于 600 凹槽/mm 和 150 凹槽/mm 光栅的 mSHS 设备。在这份概念证明文件中，将 mSHRS 光谱仪的稳定性、光谱分辨率、光谱范围和信噪比与我们使用独立光学器件的台式 SHRS 进行了比较，并且还对信噪比进行了比较Kaiser Holospec f/1.8 拉曼光谱仪。