Trial Manufacturing of An InGaAs 2-D Detector Array for Astronomical Observations

InGaAs光伏探测器已经开发和评估。并与其它探测器作了比较。我们已经在实验室和望远镜上完成了一维阵列的评估，还没有着手开发二维阵列。[Dark电流和量子效率]测量了单个和16通道阵列InGaAs探测器的暗电流随温度的变化，分别从室温到200 K和95 K。暗电流显示足够的减少在95 K，但长波长辐射的检测器的量子效率降低，其截止波长从1.7妈妈（室温）减少到1.55妈妈（95 K）。【望远镜评价】在名古屋大学50 cm望远镜上，使用128通道InGaAs阵列，通过光纤和光栅，制作了光谱分辨率为λ/Δ λ λ 5000的光谱仪，获得了1.3 μ m的明亮恒星的光谱，显示了Pa β吸收和大地吸收。[与其他探测器的比较]研制出了一种可驱动二维阵列的电子系统，其速度和噪声特性足以满足天文探测器阵列的需要。在与其他阵列相比，我们得出结论，InGaAs的优点，如暗电流低，工作温度高，但其效率在1.55妈妈的下降，在天文应用带来了困难。

InGaAs photovoltaic detectors have been developed and evaluated. Comparison of InGaAs with other detectors has been made. We have completed the evaluation of one dimensional arrays in laboratories and at a telescope, and have not proceeded to development of a two dimensional array. [Dark current and quantum efficiency] The temperature dependence of dark current of single and 16-ch array InGaAs detectors was measured from a room temperature to 200K and 95K, respectively. The dark current shows sufficient decrease at 95K, but the quantum efficiency of the detector for long wavelength radiation decreases there ; its cutoff wavelength decreases from 1.7 mum (room temperature) to 1.55 mum (95K) . [Evaluation at telescope] An 128-ch InGaAs array was on the Nagoya University 50-cm telescope with optical fibers and a grating to make a spectrometer with spectral resolution of lambda/DELTAlambdaSOOO.We obtained spectra of bright stars at 1.3 mum, which show the Pa beta absorption and telluric absorptions. [Comparison with other detectors] An electronics system which can drive two dimensional arrays has been developed ; its speed and noise characteristics are sufficient for detector arrays of astronomical use. In comparison with other arrays, we conclude that InGaAs has merits such as low dark current and high operation temperature, but that the decrease of its efficiency at 1.55 mum poses a difficulty in astronomical applications.