Noise-tolerant 3D Imaging

Non-line-of-sight imaging with picosecond temporal resolution

“…Finally, we adopt a 2.5 mW pump power accounting for the trade-off between conversion efficiency and pump saturation. An extremely low noise count rate of 5 cps under a 2.5 mW pump power after time-gating on the TDC is obtained compared to the previous work [36][37][38].…”

“…The resolution is more than one order of magnitude better than that in previous NLOS experiments [15][16][17]. Furthermore, a precise confocal setup can be realized where the up-conversion process serves as an exceptional spectraltemporal filter to rejecting the unwanted noise [38] and offering an efficient way to remove the first bounce photons in NLOS imaging. These results open avenues for the development of high-resolution NLOS imaging techniques for relevant applications.…”

“…Based on short laser pulse pumping technology [34][35][36][37][38], we construct an up-conversion single-photon detector (UCSPD) working at the near-infrared wavelength with a temporal resolution of ∼ 1.4 ps. Compared with a superconducting nanowire single-photon detector having a picosecond temporal resolution [39], our detector works at room temperature without the need for cryogenic devices.…”