Chemical hydrogen fluoride laser on a thermal chain explosion initiated by resonance IR radiation

Characteristics of a chemical H₂ — F₂ laser initiated by resonant vibrational excitation of HF molecules upon the development of a thermal chain branching reaction are theoretically studied. After the addition of N₂F₂ or F₂SO₃ molecules with partial pressure of 20 Torr to the HF:H₂:F₂:O₂:He = 0.5:76:228:23:100-Torr mixture, a specific output energy of a hydrogen fluoride laser initiated by a 2-μs pulse from an H₂ — F₂ laser with the energy density of 0.01 — 10 J cm^–2 amounted to 30 — 60 J  litre^–1, exceeding the specific initiation energy by a factor of 100 — 4000.