Lasing in caesium vapour is obtained at λ ∼ 3 μm (transitions 7P_3/2 → 7S_1/2 and 7P_1/2 → 7S_1/2). Longitudinal pumping is performed by the second harmonic of a parametric oscillator pumped by the second harmonic of a Nd³⁺-doped garnet laser. The pump wavelength corresponds to the 6S_1/2 → 7P_3/2 and 6S_1/2 → 7P_1/2 transitions of caesium atoms. The pump radiation has a spectral width of 12 cm⁻¹, a pulse energy of 10 mJ, and a pulse repetition rate of 10 Hz. The IR laser pulse energy at a vapour cell temperature of 155 C is 100 μJ. The efficiency of pump energy conversion to the laser radiation energy at λ ∼ 3 μm is ∼1.5%.

在λ ∼ 3 μm处获得铯蒸气中的激光（跃迁 7P _3/2 → 7S _1/2和 7P _1/2 → 7S _1/2）。纵向泵浦由参量振荡器的二次谐波执行，参量振荡器由 Nd ³⁺掺杂石榴石激光器的二次谐波泵浦。泵浦波长对应于铯原子的 6S _1/2 → 7P _3/2和 6S _1/2 → 7P _1/2跃迁。泵浦辐射的光谱宽度为 12 cm ^-1，脉冲能量为 10 mJ，脉冲重复率为 10 Hz。蒸气室温度为 155 C 时的 IR 激光脉冲能量为 100 μJ。泵浦能量转换为λ ~ 3 μm的激光辐射能量的效率为~1.5%。