为了探索氟化氘(DF)激光器级联效应及工作气体参数对激光光谱的影响，对自引发放电非链式脉冲DF 激光器进行了光谱特性测试。采用DF激光谱线分析仪和HgCdTe光电探测器测试了P3(7) →P2(8) →P1(9)光谱脉冲波形，发现P1(9)支谱线率先实现振荡输出，脉冲前沿延迟80~100 ns后P2(8)、P3(7) 两条谱线依次输出。在不同工作气体配比及总气压条件下测试了DF 激光输出谱线条数及各谱线间相对能量，在3.5~4.2 μm 光谱范围内测得了22 条激光跃迁谱线，且总气压为8.1 kPa，工作气体(SF6和D2)气压配比为6:1时，具有量子级联效应的P3(8) →P2(9) →P1(10)光谱串能量占总输出能量的25.9%。结果表明，多谱线DF 激光器能级间存在量子级联效应，通过优化工作气体参数可有效提升级联谱线输出时增益提取效率。

In order to explore the cascade effect of deuterium fluoride (DF) laser and the influence of working gas parameters on laser spectrum, the spectral characteristics of non-chain DF laser pumped by self-initiated volume discharge are studied. The pulse shapes of cascade lasing on P3(7) →P2(8) →P1(9) are measured by DF laser spectrum analyzer and HgCdTe photo detector, and it′ s found that the lasing line of P1(9) is initiated firstly, and P2(8) and P3(7) lines appeare 80~100 ns later. The number of laser lines and the relative energies are measured under different ratios and pressures of gas mixture, and 22 laser lines in the rang of 3.5~4.2 μm are attained. When the pressure ratio and total pressure of gas mixture (SF6 and D2) are 6:1 and 8.1 kPa, 25.9% of emitted energy is contained in the cascade lasing on P3(8) →P2(9) →P1(10). The results show that there exits cascade effect in multiline DF laser, and the extraction efficiency of laser gain with cascade output can be greatly increased by optimizing the parameters of gas mixture.