In-laboratory ALOHA mid-infrared up-conversion interferometer in the photon counting regime at λ = 3.39 μm
In-laboratory ALOHA mid-infrared up-conversion interferometer in the photon counting regime at λ = 3.39 μm
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实验室内 ALOHA 中红外上转换干涉仪，处于 λ = 3.39 μm 的光子计数状态
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
F. Reynaud
中科院分区：
文献类型：
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作者：
L. Szemendera;L. Grossard;L. Delage;F. Reynaud
天文光-光学混合分析（ALOHA@3.39µm）是为L波段高角分辨率天文成像而设计的一种新的仪器概念。我们的实验装置的独创性是在干涉仪的每一个臂上包括一个频率转换过程，将中红外信号的频率转移到近红外域。由于仪器本身辐射的热噪声背景，这种方法放宽了严格的限制。本文的目的是估计仪器的当前灵敏度极限，并验证提供校准对比度与准单色信号的能力。我们证明了在信噪比接近7的情况下测量大于94.5%的条纹对比度的可能性。在干涉仪的每条臂的输入处的通量水平等于100 fW。这将对应于1米2望远镜表面的L波段的零等恒星和3纳米的转换光谱带宽。
Astronomical Light Optical Hybrid Analysis (ALOHA@3.39 µm) is a new instrumental concept designed for high angular resolution astronomical imaging in the L Band. The originality of our experimental device is to include a frequency conversion process in each arm of the interferometer that frequency shifts the mid infrared signal to the near infrared domain. This method relaxes the stringent limitations due to the thermal noise background radiated by the instrument itself. The aim of this paper is to estimate the current sensitivity limit of the instrument and validate the ability to provide calibrated contrasts with a quasi monochromatic signal. We demonstrate the possibility to measure fringe contrasts greater than 94.5% with a signal-to-noise ratio close to 7. The flux level at the input of each arm of the interferometer is then equal to 100 fW. This would correspond to a zero magnitude star in the L Band for a 1 m 2 telescope surface and a 3 nm converted spectral bandwidth.