Researchers from the University of Science and Technology of China have designed a groundbreaking laser device capable of reading small text from distances exceeding one kilometer, according to BGR citing the journal Physical Review Letters. By utilizing active intensity interferometry, they managed to overcome traditional optical and atmospheric limitations.
Unlike conventional cameras that collect light waves through lenses, this laser device employs multiple emitters to create pseudo-thermal illumination. Reflected laser beams are captured by two telescopes, and the collected data is processed with a specialized algorithm that allows for high-detail image reconstruction.
The scientists conducted an experiment where aluminum plates with the letters "USTC" cut out, measuring 8×9 mm and with each letter only 1.5 mm wide, were placed at a distance of 1.36 km. The laser system successfully read the text with a resolution exceeding the theoretical limit of a single telescope by 14 times. The technology operates even when the signal is weak or distorted, including by weather conditions.
Although this development is still in the research stage, it holds significant potential for applications in remote sensing, contactless visualization in challenging environments, and high-precision observation. In the future, it may become a crucial tool for public safety and disaster monitoring.
