The results of a parametric investigation of the high‐pressure fission‐fragment excited atomic neon laser operating on the 703.2‐nm (3p[1/2]1→3s[3/2]20) and 724.5‐nm (3p[1/2]1→3s[3/2]10) transitions in He/Ne/Ar and He/Ne/Kr gas mixtures are reported. The highest measured power efficiency was 0.12% using a 1550‐Torr He/Ne/Kr (17/75/8) gas mixture at a pump power of 1 kW/cm3. The power efficiency and the ratio of the 703.2‐ to the 724.5‐nm laser output as a function of total pressure, He/Ne ratio, and percent of Ar or Kr will be discussed.