纳秒量级激光驱动的类氖锗软X射线激光具有出光稳定和输出强度大等优点,在诸多领域拥有很好的应用价值.研究了通过在光路中增加一块多层膜反射镜实现双程放大对出光特性的影响.通过估算和实验,证实了增加反射镜双程放大确实能够提高类氖锗软X射线激光的输出强度,对于24mm的双程放大长度,总输出强度会增加约2.3倍.但同时这种模式也带来了光束质量的下降,对应用研究并非完全有益. The nanosecond-class laser-driven neon-germanium-based soft X-ray laser has the advantages of stable output and large output intensity, and has good application value in many fields.It has been studied that the double-pass laser can be realized by adding a multi-layer film reflector in the optical path Enlarge and enlarge the influence on the light output characteristic.It is proved through estimation and experiment that the double mirror enlargement of the reflector can indeed increase the output intensity of the neon-germanium soft X-ray laser and the total output intensity will increase about 2.3 times for 24mm double-pass amplification length But at the same time, this mode also brings about a decrease of beam quality, which is not entirely beneficial to applied research.