论文标题
VLTI的Asgard/Bifrost Spectro-Intertrage仪器的光谱仪设计
Spectrograph design for the Asgard/BIFROST spectro-interferometric instrument for the VLTI
论文作者
论文摘要
Bifrost仪器将是针对高光谱分辨率优化r = 25,000的第一台VLTI仪器，并且在1.05至1.7 $μ$ m之间运行。仪器的关键组成部分将是光谱仪，在该仪器上，我们需要在宽带宽度上进行高吞吐量。在此贡献中，我们讨论了四种计划的光谱模式（r = 50，r = 1000，r = 5000和r = 25,000），我们需要覆盖的关键频谱窗口以及我们考虑的技术选择。我们介绍了使用音量阶段全息光栅（VPHG）的计划，以实现高效率$> $ 85％。我们介绍了初步的光学设计和波长校准的策略。
The BIFROST instrument will be the first VLTI instrument optimised for high spectral resolution up to R=25,000 and operate between 1.05 and 1.7 $μ$m. A key component of the instrument will be the spectrograph, where we require a high throughput over a broad bandwidth. In this contribution, we discuss the four planned spectral modes (R=50, R=1000, R=5000, and R=25,000), the key spectral windows that we need to cover, and the technology choices that we have considered. We present our plan to use Volume Phase Holographic Gratings (VPHGs) to achieve a high efficiency $>$ 85%. We present our preliminary optical design and our strategies for wavelength calibration.
