2019 Current Status and Application Prospects of Super Ultrashort Lasers Ultra-short and ultra-strong lasers can be divided into nanoseconds, picoseconds, and femtosecond lasers according to the length of the pulse. Nanosecond lasers , such as the NIF laser in the United States, the LMJ in France and the Shenguang IV in China, are the most expensive, and the energy is in the order of megajoules. Mainly used in radiation fluid mechanics, laser fusion center ignition related physics and laboratory astrophysics, such lasers are expensive to manufacture. It can only be built in some national laboratories. Picosecond lasers , for example, have been built in Japan with LFEX, as well as lasers with parameters close to the power of the tile, China’s Shenguang II upgrade, British Vulcan, and US OMEGA-EP. The cost is relatively expensive. Its energy is in the order of kilojoules, and its power reaches the level of wattage. It is mainly used for fast ignition, physics in large-scale n