Extended blue GaAs image intensifiers
Extended blue GaAs image intensifiers
复制标题
DOI：
10.1117/12.218624
复制
发表时间：
1995-09
期刊：
影响因子：
--
通讯作者：
T. Sinor;J. Estrera;D. Phillips;M. Rector
中科院分区：
文献类型：
--
作者：
T. Sinor;J. Estrera;D. Phillips;M. Rector
第三代图像增强器使用铝砷化镓/砷化镓 (AlGaAs/GaAs) 异质结构光电阴极，通常对 550-900 nm 波长范围内的光敏感。通过将光谱响应扩展到电磁频谱的蓝色（小于 550 nm）区域来提高第三代夜视设备性能的可能性最近引起了人们的极大兴趣。这很大程度上是由于显像管蓝色响应的增加显着增加了沙地或沙漠地形中目标的检测、识别和识别。第三代显象管的短波长响应主要由AlGaAs窗口的厚度和成分以及GaAs有源层的厚度决定。在本文中，我们回顾了AlGaAs层对第三代显像管整体性能的作用，并讨论了AlGaAs/GaAs异质结构的光学特性。最后，通过在 500 nm 处量子效率大于 20% 的密封管上提供的数据讨论了蓝色增强光电阴极的整体性能。
Generation III image intensifiers use an aluminum gallium arsenide/gallium arsenide (AlGaAs/GaAs) heterostructure photocathode that typically sensitive to light in the wavelength range of 550-900 nm. The possibility of improving the performance of Generation III night viewing devices by extending the spectral response into the blue (less than 550 nm) region of the electromagnetic spectrum has stimulated considerable interest lately. This is largely due to the fact that an increase in the blue response of the image tube significantly increases detection, recognition, and identification of targets in sandy or desert terrain. The short wavelength response of the Generation III image tube is primarily dominated by the thickness and composition of the AlGaAs window and the thickness of the GaAs active layer. In this paper, we review the role of the AlGaAs layer to the overall performance of the Gen III image tube and discuss the optical properties of the AlGaAs/GaAs heterostructure. Finally, the overall performance of blue enhanced photocathodes is discussed with data presented on sealed tubes with quantum efficiencies greater than 20% at 500 nm.