第二型带间级联激光器是一种有效的全固化中红外光源,具有广泛的应用前景。介绍了中红外带间级联激光器的结构,工作原理,最新研究进展,并对影响其工作性能的因素进行了讨论。 The second interstage cascade lasers are an effective all-curing mid-infrared light source with a wide range of applications. The structure, working principle and newest research progress of mid - infrared band cascaded lasers are introduced, and the factors that affect its performance are discussed.