最近一些实验上的发现,指出了一种制造X射线激光器的可能的途径。这就是发现了在稀有气体原子团中,原子内壳层多光子激发的新机制,使得我们更加接近制成实际可用的、硬X射线激光器的目标。早在本世纪50年代后期,在近可见光谱区域内,已经获得了受激辐射的光放大器件。其后不久,接踵而来的是努力设计更短波长的激光 Some recent experimental findings point to a possible way to make X-ray lasers. This is the discovery of a new mechanism of multiphoton excitation in the inner shell of a rare gas atom that brings us closer to the goal of making a practically usable hard X-ray laser. As early as the late 1950s, an optical amplifier device for stimulated radiation has been obtained in the near visible spectral region. Shortly thereafter, the ensuing efforts to design a shorter wavelength laser