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.
@article{arxiv.1506.07920,
title = {Few-photon imaging at 1550 nm using a low-timing-jitter superconducting nanowire single-photon detector},
author = {H. Zhou and Y. He and L. You and S. Chen and W. Zhang and J. Wu and Z. Wang and X. Xie},
journal= {arXiv preprint arXiv:1506.07920},
year = {2023}
}