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讨论了一种新型的1.06微米的固体探测器。这种反向异质结Ⅲ—Ⅴ族合金台面光电二极管显示出接近100％的量子效率,特别是低的电容值,小的渡越时间和低的暗电流。这种探测器适用于灵敏的1.06微米光学接收器中。在许多应用中比其他现有的1.06微米光电探测器有较好的信噪比。详细地讨论了在规定的信号条件下给出最佳信噪比的选择光电二极管和前置放大器参数的一种最佳程序,以及讨论这种技术应用到一种推荐的系统中。在激光照明空中夜间成象系统中,最佳接收器的一种小尺寸异质结Ⅲ—Ⅴ族合金光电二极管探测器将给出比其他1.06微米探测器高得多的信噪比,即使其他的1.06微米探测器有较低的噪声等效功率(NEP)值的情况下也是如此。实际说明,为了比较探测器的特性参数,如噪声等效功率只适用于比较在某种特定类型应用中的同类探测器(例如在高背景辐射应用中比较各种红外光电导器件),而且对特定系统应用,在确定不同类型探测器的相对性能时只有很小的价值(例如比较光电倍增管、雪崩光电二极管和低噪声光电二极管)。
A new type of 1.06 micron solid detector is discussed. This reverse heterojunction III-V alloy mesa photodiode shows nearly 100% quantum efficiency, especially low capacitance, small transit time and low dark current. This detector is suitable for sensitive 1.06 micron optical receivers. In many applications than other existing 1.06 micron photodetectors have a better signal to noise ratio. A detailed discussion of the best procedure for selecting the parameters of a photodiode and preamplifier that give the best signal-to-noise ratio under the specified signal conditions, and discussing the application of this technique to a recommended system. In a laser-illuminated sky night imaging system, a small-sized heterojunction III-V alloy photodiode detector of the best receiver will give a much higher signal-to-noise ratio than other 1.06 micron detectors, even though other The 1.06 micron detector has lower noise equivalent power (NEP) values as well. As a practical matter, in order to compare the detector’s characteristic parameters, such as noise equivalent power, it is only applicable to comparing detectors of the same type in a particular type of application (eg comparing various infrared photoconductive devices in high background radiation applications) Specific system applications have little value in determining the relative performance of different types of detectors (such as comparing photomultiplier tubes, avalanche photodiodes, and low noise photodiodes).