Corliss J B, Harris W M, Mierkiewicz E J, Roesler F L
Appl Opt. 2015 Oct 20;54(30):8835-43. doi: 10.1364/AO.54.008835.
We describe the design, development, and performance of a narrowband, all-reflective, unaliased spatial heterodyne spectrometer (SHS) that has been tested in observations at the focus of the 1.6 m main telescope of the McMath-Pierce solar telescope on Kitt Peak. The all-reflective SHS described herein is a highly robust common-path Fourier transform spectrometer without moving parts that, over a limited spectral region, combines the large field of view and high resolving power characteristic of interference spectrometers but at substantially reduced instrument size and optical tolerances. The self-scanned region of wavelength space and resolving power of the SHS are determined by the beam size, the diffraction grating groove density, the number of detector elements, and the fixed orientation of a set of pilot mirrors. The results presented here represent the first successful implementation of this reflective SHS design for field use. We discuss concepts behind the unaliased reflective SHS design and report the performance of the instrument when used to observe terrestrial airglow and absorption features, the solar spectrum, and the Jovian spectrum near λ=6300 Å, at the achieved resolving power (R=λ/δλ) of R>100,000. The results confirm that reflective SHS instruments can deliver effective interferometric performance in the visible to the far-ultraviolet wavelengths with commercial optics of moderate surface quality.
我们描述了一种窄带、全反射、无混叠的空间外差光谱仪（SHS）的设计、开发和性能，该光谱仪已在基特峰麦克马思 - 皮尔斯太阳望远镜1.6米主望远镜焦点处的观测中进行了测试。本文所述的全反射SHS是一种高度稳健的共光路傅里叶变换光谱仪，没有活动部件，在有限的光谱区域内，它结合了干涉光谱仪的大视场和高分辨率特性，但仪器尺寸和光学公差大幅减小。SHS的波长空间自扫描区域和分辨率由光束尺寸、衍射光栅刻线密度、探测器元件数量以及一组导向镜的固定取向决定。这里给出的结果代表了这种反射式SHS设计首次成功应用于实地。我们讨论了无混叠反射式SHS设计背后的概念，并报告了该仪器在用于观测地辉和吸收特征、太阳光谱以及木星在λ = 6300 Å附近的光谱时的性能，其实现的分辨率（R = λ/δλ）R > 100,000。结果证实，反射式SHS仪器使用中等表面质量的商业光学元件，在可见光到远紫外波长范围内能够提供有效的干涉测量性能。
