Degradation of the disperse component of the active medium of a pulsed chemical HF laser

The Brownian coagulation model and the Stokes particle precipitation law were used to analyse the dynamics of changes in the characteristics of a condensed disperse component of the chemically active medium of a pulsed HF laser. It was found that, if coagulation predominates over precipitation, the required average particle size (r₀ ~ 0.1 – 0.5 μm) and concentration (N ~ 5 × 10⁸ – 10⁷ cm^–3) of an aluminium aerosol in an H₂ — F₂ — O₂ — He chemically active medium can be reached in ~1000 s. The precipitation of particles begins to compete with the coagulation only for r₀ ≥ 1 μm.