Development of an integrated near-IR astrophotonic spectrograph
Development of an integrated near-IR astrophotonic spectrograph
复制标题
集成近红外天体光子光谱仪的开发
DOI：
--
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
J. Bland
中科院分区：
文献类型：
--
作者：
P. Gatkine;M. Sitaram;S. Veilleux;M. Dagenais;J. Bland
在这里，我们介绍了一台近红外H波段(1.45-1.65μm)的天体光子光谱仪，光谱分辨率(λ/δλ)为1500。光谱仪的主要色散元件是基于阵列光波导栅技术的光子芯片。AWG焦平面上产生的一维光谱包含重叠的光谱级数，每个级数跨越10 nm的波长。利用由准直透镜和棱镜组成的交叉色散装置，这些光谱级数在垂直方向上被交叉色散，从而将2D光谱成像到近红外探测器上。这里，作为概念验证，我们使用几模光子灯来捕获光，并将发出的单模输出馈送到AWG芯片进行色散。装置的总尺寸是50厘米x 30厘米x 20厘米米，几乎是一个鞋盒的大小。该光谱仪将为未来大型望远镜上的小型化集成光子光谱仪，特别是为建造未来的光子多目标光谱仪铺平道路。
Here, we present an astrophotonic spectrograph in the near-IR H-band (1.45 -1.65 μm) and a spectral resolution (λ/δλ) of 1500. The main dispersing element of the spectrograph is a photonic chip based on Arrayed-Waveguide- Grating technology. The 1D spectrum produced on the focal plane of the AWG contains overlapping spectral orders, each spanning a 10 nm band in wavelength. These spectral orders are cross-dispersed in the perpendicular direction using a cross-dispersion setup which consists of collimating lenses and a prism and the 2D spectrum is thus imaged onto a near-IR detector. Here, as a proof of concept, we use a few-mode photonic lantern to capture the light and feed the emanating single-mode outputs to the AWG chip for dispersion. The total size of the setup is 50 cm x 30 cm x 20 cm3, nearly the size of a shoebox. This spectrograph will pave the way for future miniaturized integrated photonic spectrographs on large telescopes, particularly for building future photonic multi-object spectrographs.