ZHOU Hai-Jun, WANG Wen-Zhe, ZHENG Yao-Hui. Improvement of high-gain shot-noise detector[J]. Editorial Office of Optics and Precision Engineering, 2013,21(11): 2737-2743
Based on the special demands of 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-amplify 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 spectrum of the detector is 10 dB higher than that of electronic noise spectrum when the injecting power for the detector is more than 850 W at 2 MHz. Furthermore
the bandwidth of the shot noise detector 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 advantageous to quantum optic experiments.
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