Evaluation of InGaAs 640×512 detector array manufactured by Chunghwa Leading Photonics Tech
Evaluation of InGaAs 640×512 detector array manufactured by Chunghwa Leading Photonics Tech
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中华领先光电制造的InGaAs 640×512探测器阵列的评估
DOI：
10.1117/12.2055084
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Kaneda Hidehiro
中科院分区：
文献类型：
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作者：
Nagayama Takahiro;Takeuchi Nami;Kokusho Takuma;Yamanaka Asa;Nishiyama Miho;Kaneda Hidehiro
焦平面阵列(FPA)是现代近红外天文观测的关键设备，但价格昂贵，不易获得。价格低廉、性能合理的近红外焦平面对推广近红外观测具有重要意义。FPA640×512是中华领先的光电子科技公司生产的640×512InGaAs型探测器，波长范围为0.9-1.7μm。由于这种阵列比天文观测中常用的近红外焦平面阵列便宜得多，如果FPA640×512具有可接受的性能，那么对于不需要太多像素的特定项目来说，它可能是一个很好的选择。我们已经在室温和低温环境下对一个测试级FPA640×512阵列进行了评估。为了评估这种焦平面阵列在低温环境下的特性，我们用机械制冷机对其进行冷却，确认其工作在100K。我们发现，暗电流随着焦平面阵列温度的降低呈指数下降，但在默认设置下，暗电流在~1000E−/s的200K处达到最低点。我们正试图通过优化偏置电压和通向多路复用器电路的电流来减少暗电流。最新的实验表明，暗电流有可能降低到~200E−/秒。这一数值仍然高于科学观测中使用的近红外焦平面，但它可能适用于特殊目的，例如，光谱仪中狭缝观察器的焦平面，波前传感器等。
Focal Plane Arrays (FPA) are key items for modern astronomical observations in the near infrared wavelength, but it is very expensive and not easy to get them. Less expensive NIR FPAs with reasonable performance are very important to spread NIR observation extensively. FPA640×512 manufactured by Chunghwa Leading Photonics Tech is a 640×512 InGaAs detector covering the 0.9-1.7μm wavelength. Since this array is significantly cheaper than the commonly used NIR FPAs in the astronomical observation, it is possible to be a good choice for particular projects which do not need many pixels, if FPA640×512 has acceptable performance for the purpose. We have evaluated one test grade array of FPA640×512 both in the room and low temperature environment. In order to evaluate the characteristics of this FPA in the low temperature environment, we cooled it down by the mechanical refrigerator and confirmed that it works at 100 K. We have found that the dark current reduces exponentially as the FPA temperature decreases, but it hits the bottom at~1000e−/secbellow 200 K with the default setting. We are trying to reduce the dark current by optimizing the bias voltage and the current to the MUX circuit. The latest experiments have shown the possibility that the dark current decreases to~200e−/sec. This value is still higher than that of NIR FPAs used in the scientific observation, but it may be applicable for the particular purpose, for example, FPAs for slit viewer in spectrometers, wave front sensor, and so on.