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激光是20世纪60年代出现的最重大科技成就之一,它的形成是基于特定能级间粒子数反转体系的受激辐射过程,因而使激光具有一系列与普通光截然不同的新颖特点。
Laser is one of the most significant technological achievements in the 1960s. Its formation is based on the stimulated emission process of the particle number inversion system between specific energy levels, so that the laser has a series of novel features that are totally different from ordinary light.