title: Few-photon imaging at 1550 nm using a low-timing-jitter superconducting nanowire single-photon detector.
abstract: We demonstrated a laser depth imaging system based on the time-correlated single-photon counting technique, which was incorporated with a low-jitter superconducting nanowire single-photon detector (SNSPD), operated at the wavelength of 1550 nm. A sub-picosecond time-bin width was chosen for photon counting, resulting in a discrete noise of less than one/two counts for each time bin under indoor/outdoor daylight conditions, with a collection time of 50 ms. Because of the low-jitter SNSPD, the target signal histogram was significantly distinguishable, even for a fairly low retro-reflected photon flux. The depth information was determined directly by the highest bin counts, instead of using any data fitting combined with complex algorithms. Millimeter resolution depth imaging of a low-signature object was obtained, and more accurate data than that produced by the traditional Gaussian fitting method was generated. Combined with the intensity of the return photons, three-dimensional reconstruction overlaid with reflectivity data was realized.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhou
authors.forename: Yuhao
authors.initials: Y
authors.lastname: He
authors.forename: Lixing
authors.initials: L
authors.lastname: You
authors.forename: Sijin
authors.initials: S
authors.lastname: Chen
authors.forename: Weijun
authors.initials: W
authors.lastname: Zhang
authors.forename: Junjie
authors.initials: J
authors.lastname: Wu
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wang
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Xie