中文摘要：

针对量子光学实验对低噪声探测器的特殊需求,采用交流电流耦合跨阻抗前置放大电路和ETX500光电二极管设计了高增益散粒噪声探测器.与现有的探测器相比,该探测器在增益、带宽、交直流饱和特性3方面的性能均有明显提升.采用1 064 nm的单频激光器作光源,频谱分析仪作噪声测量工具,测量了探测器的输出特性.在分析频率2 MHz处,测量得到注入探测器的功率为850 μW时,输出的噪声功率谱较电子学噪声谱高10 dB;注入探测器的功率大于1.62mW时,探测器的带宽达到5 MHz.注入的光功率为0.85～36 mW时,探测器保持良好的交流与直流线性特性.设计的探测器的高增益与较高的交直流饱和特性,为量子光学实验提供了重要的探测工具.

英文摘要：

Based on the special demands o{ quantum optical experiments for low noise detectors, a high gain and shot noise detector was designed by combing an AC current coupled trans-impedance pre-am- plify circuit and an ETX500 photodiode. Compared with existing detectors, the designed detector shows better characteristics in gain, bandwidth and AC ＆ DC saturation. The output characteristics of the detector were measured by using a 1 064 nm single frequency laser as a source and a frequency spectrum analyzer as the measuring instrument. Measuring results show that the power noise spec- trum of the detector is 10 dB higher than that of electronic noise spectrum when the injecting power for the detector is more than 850μW at 2 MHz. Furthermore, the bandwidth of the shot noise detec- tor reaches 5 MH when the input infrared laser power is above 1.62 mW. The remarkable linearities for the DC and AC currents are available when the input infrared laser power is increased to 36 mW. Considering its higher gain and better DC ＆ AC saturation characteristics, the detector is advanta- geous to quantum optic experiments.