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We report a photon-counting depth imager with sub-centimeter resolution of low-signature targets at kilometer range. The system exploited a Peltier-cooled InGaAs/InP single-photon detector module and a 1550 nm wavelength pulsed laser with sub-milliwatt average powers.
Single-photon time-of-flight ranging offers shot-noise limited detection and excellent surface-to-surface resolution. Infrared operation is advantageous in terms of improved eye safety and reduced solar background. Despite a number of recent advances in semiconductor infrared single photon detectors [1] little is available in the open literature in terms of long-range single-photon depth imaging....
Active, three-dimensional long-range imaging using time-correlated single photon counting has the potential for accurate depth resolution at low average power illumination. We report advances in this field.
We have developed a robust, BB84, 850 nm wavelength, gigahertz clock, phase encoding quantum key distribution system. This has been analyzed using a number of single-photon detectors and tested against predictions from our theoretical model.
The new generation of 3D imaging systems based on laser radar (ladar) offers significant advantages in defense and security applications. In particular, it is possible to retrieve 3D shape information directly from the scene and separate a target from background or foreground clutter by extracting a narrow depth range from the field of view by range gating, either in the sensor or by postprocessing...
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