It is shown that a self-sustained volume discharge is possible in mixt
ures of SF6 with hydrocarbons (or deuterated carbons) without special
devices for the preionisation of the gas. This can be achieved with an
extremely compact electrode system. Wide-aperture nonchain HF (DF) la
sers with a high output radiation energy can be constructed on the bas
is of the discharge. It is reported that output energies of 144 J for
HF and 115 J for DF were achieved in a system with a 21-litre active m
edium and an aperture of similar to 15 cm. The electric efficiencies w
ere 2.8% and 2.2%, respectively.