On the modern battlefield, drones have become the reshaping force of air defense confrontation rules and the driving force behind the evolution of war forms, but their limited range has always been their weakness. Recently, a US company launched laser wireless power transmission technology, which is expected to help drones bid farewell to "range anxiety" and achieve unlimited range. The principle of laser wireless power transmission technology is not complicated. Simply put, it uses high-power lasers as power transmission lines to accurately transmit the electrical energy from the ground grid or solar panels to the photovoltaic converter on the drone. The converter then converts the laser energy into electrical energy, providing continuous power to the drone. The researchers of this technology explain: 'We are creating an end-to-end transmission technology, like building an invisible transmission line in the air, allowing power transmission to break through the constraints of traditional cables.' Safety is the main issue faced by laser wireless transmission technology, and the research and development team has designed a multi-layer protection system for this purpose. When obstacles appear on the path of the laser beam, the system can instantly detect and temporarily turn off the laser source, and restart it on its own after the obstacles leave. Drones can still rely on their own batteries to maintain operation during laser interruptions. At present, these security measures have been verified by third-party organizations such as the US Department of Defense Navy Laser Security Review Committee. It is worth mentioning that this laser is completely different from weapon level lasers. Its beam concentration is low, the energy density is moderate, and it will not cause cutting or burning, resulting in the problem of "laser injury". The advantages of laser wireless power transmission technology are obvious. Unlike ordinary power supply methods, laser wireless transmission is difficult to interfere with, and only when the internal electronic components of the system are subjected to strong electromagnetic pulse impact will they be affected. In addition, although there are limitations such as line of sight transmission, inability to penetrate clouds and mountains, with the help of relay transmission technology, theoretically, laser beams can "cross mountains and valleys" and achieve beyond line of sight transmission. At present, laser wireless power transmission technology is still in the prototype development stage, but has received support from the US military. In addition, it also has certain civilian prospects, such as supplying power to communication base stations in remote areas and replacing power transmission lines in cities. Its future development prospects are worth paying attention to. (New Society)