Bao Zeyu, Liang Yan, Wang Zhiyuan, Li Zhaohui, Wu E, Wu Guang, Zeng Heping
Appl Opt. 2014 Jun 20;53(18):3908-12. doi: 10.1364/AO.53.003908.
Sensitive laser ranging was demonstrated at few-photon level using photon-number-resolving (PNR) detectors. The reflected photon pulses from a non-cooperation remote target were distinguished in a sunlight environment of 2.5×103 lx by setting the discrimination threshold at 5-photon level. By comparing the detected photon numbers, two remote targets with different reflection coefficients were well recognized. PNR detection facilitated remote laser ranging of few-photon sensitivity with similar capabilities of linear optical detectors. This technique avoids photon-counting saturation and is important for ultra-long distance LIDAR and 3D imaging at a few photon level.
