A VIPA Spectrograph with Ultra-high Resolution and Wavelength Calibration for Astronomical Applications

A VIPA Spectrograph with Ultra-high Resolution and Wavelength Calibration for Astronomical Applications
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适用于天文应用的具有超高分辨率和波长校准功能的 VIPA 光谱仪

DOI:
10.3847/1538-3881/aba836
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发表时间:
2020-08
影响因子:
5.3
通讯作者:
He Jinping
He Jinping
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhu Xiaoming;Lin Dong;Hao Zhibo;Wang Liang;He Jinping

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介绍了一种以虚拟成像相控阵(VIPA)为主要色散元件的光谱仪样机,并在实验室对其性能进行了全面的测试。同时进行波长校准的单模光纤馈电光谱仪的光谱分辨率远远高于传统的具有类似分辨率的光谱仪,而VIPA的尺寸要比传统的光谱仪小几个数量级。在实验室测试中,基于ViPA的仪器采用自制的Yb:光纤环形激光频率梳,在6小时内显示出41厘米S−1的模模跟踪稳定性。VIPA光谱仪在各种对超高分辨率和定标精度要求很高的天文观测中有着广阔的应用前景,如太阳物理研究、径向速度法系外行星搜索以及类地行星大气中的O2探测。最后讨论了视距受限条件下夜空观测的可行优化方法。
A prototype spectrograph using a Virtually Imaged Phased Array (VIPA) as the main dispersion element is presented, and its performance is fully examined in our laboratory. The single-mode, fiber-fed spectrograph with simultaneous wavelength calibration possesses a spectral resolution well in excess of while the size of the VIPA is several orders of magnitude smaller than that of a conventional échelle with comparable resolution. In laboratory tests, the VIPA-based instrument with a homemade Yb:fiber ring laser frequency comb demonstrates a mode-to-mode tracking stability of 41 cm s−1 over a period of 6 hr. The VIPA spectrograph has promising applications in various astronomical observations in which ultra-high resolution and calibration precision are imperative, such as solar physics research, exoplanet searching with the radial velocity method, and O2 detection in the atmosphere of Earth-like planets. Ultimately, feasible optimizations for night-sky observations under seeing limited conditions are discussed.
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