【摘要】 根据单光子探测系统的要求及其特点,采用半导体制冷技术,研制出了用于单光子探测的雪崩光电二极管(APD)的水循环散热制冷腔。通过配备测量精度为0.1℃的温控仪,降低了APD的工作环境温度。通过实验探讨了APD的温度特性,得到了APD的雪崩电压、暗电流、光电流、等效噪声功率与温度的关系。结果表明:降低APD的工作温度有利于减小APD的等效噪声功率,APD存在最佳工作温度。更多还原

【Abstract】 According to the requirements and the characteristics of the single-photon detect System,a water-cooling system based on thermoelectricity cooling accompanied by a temperature control instrument was developed to reduce the temperature of the detector avalanche photodiode(APD).Experiments were done to probe into the characteristics of APD.The relationships between avalanche voltage,dark current,photocurrent,NEP and temperature were educed separately.Experimental results show that NEP of APD can be reduced by reducing the temperature,and there is an optimal working temperature for APD.更多还原