Researchers from the University of Science and Technology of China have developed an innovative laser device that can read fine text from over a kilometer away, according to BGR referencing the scientific journal Physical Review Letters. By employing active intensity interferometry, they managed to overcome conventional optical and atmospheric limitations.

Unlike traditional cameras that collect light waves through lenses, this laser device utilizes multiple emitters to create pseudo-thermal illumination. Reflected laser beams are captured by two telescopes, and the resulting data is processed by a specialized algorithm, allowing for high-detail image reconstruction.

The scientists conducted an experiment where they placed aluminum plates with cut-out letters “USTC” measuring 8×9 mm at a distance of 1.36 km, with each letter having a width of just 1.5 mm. The laser system successfully read the text, achieving a resolution that exceeds the theoretical limit of a single telescope by 14 times. The technology operates even when the signal is weak or distorted, including due to weather conditions.

This development, while still in the research phase, holds significant potential for applications in remote sensing, contactless visualization in challenging environments, and high-precision observation. In the future, it could become an essential tool for public safety and disaster monitoring.