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

InGaAs光伏探测器已被开发和评价。并与其它探测器进行了比较。我们已经在实验室和望远镜上完成了对一维阵列的评估，还没有着手开发二维阵列。[暗电流与量子效率]在室温至200K和95K范围内分别测量了单阵列和16ch阵列InGaAs探测器暗电流的温度依赖性。暗电流在95K处有充分的减小，但探测器对长波辐射的量子效率在95K处下降；其截止波长从1.7 mum（室温）减小到1.55 mum （95K）。[望远镜评价]在名古屋大学50厘米望远镜上安装128-ch InGaAs阵列，采用光纤和光栅组成光谱分辨率为λ /DELTAlambdaSOOO的光谱仪。我们获得了明亮恒星在1.3℃时的光谱，显示了Pa - β吸收和大地吸收。[与其他探测器的比较]研制了一种驱动二维阵列的电子系统；它的速度和噪声特性足以用于天文探测阵列。与其他阵列相比，我们认为InGaAs具有低暗电流和高工作温度等优点，但其效率在1.55 μ m时的下降给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.