China's new 2.47kW portable laser works in Arctic cold, Saharan desert

Chinese scientists at the National University of Defence Technology have developed a portable 2.47-kilowatt fiber laser weapon capable of operating in extreme temperatures ranging from -58°F (-50°C) to 122°F (50°C) without requiring cooling or heating systems. This innovation allows the laser to function effectively in diverse environments, from the Arctic to the Sahara Desert, overcoming the typical need for bulky cooling infrastructure found in most high-power lasers. The laser achieves this through several technological advancements, including a novel low-heat pump laser design, smart multi-directional light injection, thermal isolation of sensitive components, tight fiber cooling to suppress energy loss, and a ytterbium-doped fiber core that efficiently converts energy into laser light with 71% efficiency. With near-perfect beam quality at 2.47 kW output, the laser can disable drones and cut through various materials from over 0.62 miles (1 km) away. Its portability—small enough to fit in a suitcase—offers significant