A Monolithic Spatial Heterodyne Raman Spectrometer: Initial Tests
A Monolithic Spatial Heterodyne Raman Spectrometer: Initial Tests
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DOI：
10.1177/0003702820936643
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发表时间：
2020-08-27
影响因子：
3.5
通讯作者：
Angel, S. Michael
中科院分区：
文献类型：
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作者：
Waldron, Abigail;Allen, Ashley;Angel, S. Michael
描述了一种单片空间外差拉曼光谱仪（mSHRS），其中光谱仪的光学元件被粘接成一个小而稳定的一体式结构。这建立在之前的工作基础上，我们描述了为行星航天器和漫游者开发的台式空间外差拉曼光谱仪（SHRS）。SHRS是基于一个固定光栅空间外差光谱仪（SHS），在一个小的占地面积提供高光谱分辨率和高光吞吐量。SHS的分辨率不依赖于狭缝，由于它不是色散器件，因此无需使用长焦距色散光学器件即可实现高分辨率。因此，使用标准的1024元电荷耦合器件，SHS可以作为紧凑的具有高光谱分辨率和大光谱范围的拉曼光谱仪的组件。由于SHRS的分辨率不依赖于长光程，因此可以使用单片结构技术来制造紧凑而坚固的设备。在本文中，我们描述了两种不同的单片SHSs （mSHSs）的使用，其Littrow波长分别为531.6 nm和541.05 nm，每个尺寸约为3.5 x 3.5 x 2.5 cm，重量约为80 g，在拉曼光谱仪中分别为600沟槽/mm和150沟槽/mm光栅mSHS器件提供类似于3500 cm（-1）的光谱范围，4-5 cm（-1）和8-9 cm（-1）分辨率。在这篇概念验证论文中，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式光学元件的台式SHRS进行了比较，并与Kaiser Holospecf/1.8拉曼光谱仪进行了信噪比较。
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 x 3.5 x 2.5 cm in size and weighing about 80 g, in a Raman spectrometer that provides similar to 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 Holospecf/1.8 Raman spectrometer.