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Hg Cd Te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3.5~4.2μm光谱范围内测得了22条激光跃迁谱线,且总气压为8.1 k Pa,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 effects of deuterium fluoride (DF) laser cascade and working gas parameters on the laser spectrum, the spectral characteristics of self-initiated discharge non-chained DF laser were tested. The pulse waveforms of P3 (7) → P2 (8) → P1 (9) were tested by using DF laser line analyzer and Hg Cd Te photodetector. It was found that P1 (9) After 80 ~ 100 ns P2 (8), P3 (7) two lines followed by the output. The number of DF laser output lines and the relative energy between the lines were tested under different working gas ratios and total pressure conditions. Twenty-two laser transition lines were measured in the 3.5-4.2 μm spectral range and the total pressure was 8.1 kPa, and the energy of P3 (8) → P2 (9) → P1 (10) with the quantum cascade effect is 25.9% of the total output energy when the gas pressure ratio of working gas (SF6 and D2) is 6: 1. The results show that there is a quantum cascade effect between the multi-line DF laser energy levels, and the gain efficiency of the cascaded line output can be effectively improved by optimizing the working gas parameters.