开展了HF/DF激光器谐振腔内基态分子光吸收对其输出性能影响的实验研究，测量并分析了从不同位置注入H2/D2时激光器的输出功率和光谱变化。结果表明：振动基态HF(ν=0)/DF(ν=0)分子通过单光子共振机制吸收1P支谱线，通过双光子共振机制吸收2P支谱线；振动转动激射带间存在一定程度的级联跃迁效应；在基态分子与激发态分子数量相当(11)的情况下，HF激光器输出功率降低了50%左右，DF激光器输出功率降低了90%左右；利用传统的燃料组合研制燃烧驱动HF-DF双波段化学激光器是不可行的。

Influence of photon absorption of ground state molecules in resonator cavity on HF-DF dual-band chemical laser output performance is investigated through experiments. Variations of spectra and output powers of HF laser and DF laser operated with different positions of H2/D2 injection are measured and analyzed. The results show that the spectral lines of 1P (the P-branch transition between vibrational states of ν=1→ν=0) are absorbed by the ground state molecules through the mechanism of single-photon resonance absorption. The spectral lines of 2P (the P-branch transition of ν=2→ν=1) are absorbed by the ground state molecules through the mechanism of double-photon resonance absorption one by one. Cascading transition effect of lasing band between vibration-rotational states exists in some extent. Output power of HF laser decreases by approximately 50%, and output power of DF laser decreases by approximately 90% when the amount of ground state molecules and the amount of excited state molecules are equivalent. Traditional fuel compositions are not applicable for developing combustor-driven HF-DF dual-band chemical lasers.