Towards a mid-infrared L band up-conversion interferometer: first on-sky sensitivity test on a single arm
Towards a mid-infrared L band up-conversion interferometer: first on-sky sensitivity test on a single arm
复制标题
迈向中红外 L 波段上转换干涉仪：首次单臂空中灵敏度测试
DOI：
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发表时间：
2019
影响因子：
4.8
通讯作者：
D. Vernet
中科院分区：
文献类型：
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作者：
L. Lehmann;L. Grossard;L. Delage;F. Reynaud;M. Chauvet;F. Bassignot;F. Martinache;F. Morand;J. Rivet;F. Schmider;D. Vernet
本文报道了首次在天文光学混合分析(ALOHA)仪器的单臂上进行的灵敏度测试，该仪器是一台L波段(3.5μm)的非制冷上转换干涉仪。尽管1米级望远镜和我们的仪器之间的耦合效率很低(在1%的范围内)，但我们在30分钟的积分时间内探测到了一颗星等Lmag=2.8的恒星，信噪比SNR=2.7，光谱分辨率λ/λ=100。由于ALOHA项目的目标是将光从L波段转移到近红外，使用极低损耗的二氧化硅光纤是实现中红外光纤连接超长基线干涉测量的重要一步。
We report on the first on-sky sensitivity test on a single arm of the Astronomical Light Optical Hybrid Analysis (ALOHA) instrument, an uncooled up-conversion interferometer in the L band (3.5μm). Despite a low coupling efficiency (in the range of 1 per cent) between the 1-m class telescope and our instrument, we detect a magnitude Lmag = 2.8 star with a signal-tonoise ratio SNR = 2.7 over a 30 min integration time and with a spectral resolution λ/ λ = 100. As the ALOHA project aims to shift light from the L band to the near-infrared, the use of very low loss silica optical fibres is an important step towards fibre-linked very long-baseline interferometry in the mid-infrared.