An experimental investigation was made of the operational characterist
ics of a self-contained supersonic cw chemical HF laser. A three-jet n
ozzle array with reagent jets separated spatially by helium jets was u
sed. This nozzle array (replacing its two-jet analogue) made it possib
le to increase by a factor of 1.20-1.35 the energy characteristics of
the laser and by a factor of 1.4-1.7 (up to 125-150 mm) the length of
the active medium, and at the same time reduce by 30 % the level of op
tical inhomogeneities in this medium.