Long-range micro-pulse aerosol lidar at 1.5 um with an up-conversion   single-photon detector
  A micro-pulse lidar at eye-safe wavelength is constructed based on an up-conversion single-photon detector. The ultralow noise detector enables using integration technique to improve the signal-to-noise ratio of the atmospheric backscattering even at daytime. With the pulse energy of 110uJ, the pulse repetition rate of 15 kHz, the optical antenna diameter of 100 mm and integration time of 5 minutes, a horizontal detection range of 7 km is realized. In the demonstration experiment, atmospheric visibility over 24 hours is monitored continuously, with results in accordance with the weather forecasts. 
Haiyun Xia, Guoliang Shentu, Mingjia Shangguan, Xiuxiu Xia, Xiaodong   Jia, Chong Wang, Jun Zhang, Qiang Zhang, Xiankang Dou...
physics.optics physics.ins-det quant-ph