1 引 言大气激光生态监控的基本任务是测定与辐射源较大距离处各种气体和气溶胶的浓度。从污染物质吸收带观点看,3~5μm光谱区是最有意义的。因此,以混合气体闭循环的氘与氖非链式反应为基础的重复率DF激光器(λ＝3.5~4.0μm)是光雷达有前途的光辐射源。 1 Introduction The basic task of atmospheric laser eco-monitoring is to determine the concentrations of various gases and aerosols at large distances from the radiation source. From the point of view of the absorption of pollutants, 3 ~ 5μm spectral region is the most significant. Therefore, the repetition rate DF laser (λ = 3.5 ~ 4.0μm) based on the deuterium-neon non-chain reaction of the closed loop of the mixed gas is a promising optical radiation source for photoradiography.