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Superconducting nanowire single-photon detectors (SNSPDs) at a wavelength of532 nm were designed and fabricated aiming to satellite laser ranging (SLR)applications. The NbN SNSPDs were fabricated on one-dimensional photoniccrystals with a sensitive-area diameter of 42 um. The devices were coupled withmultimode fiber (phi=50um) and exhibited a maximum system detection efficiencyof 75% at an extremely low dark count rate of <0.1 Hz. An SLR experiment usingan SNSPD at a wavelength of 532 nm was successfully demonstrated. The resultsshowed a depth ranging with a precision of ~8.0 mm for the target satelliteLARES, which is ~3,000 km away from the ground ranging station at the SheshanObservatory.

Superconducting nanowire single photon detector at 532 nm and demonstration in satellite laser ranging