[en] Nuclear pumped lasing on the neutral carbon line at 1.45 μ has been achieved in mixtures of He-CO, He-N₂-CO, He-CO₂, and Ne-CO and Ne-CO₂. A minimum thermal neutron flux of 2 x 10¹⁴ n/cm²-sec was sufficient for oscillation in the helium mixtures. The peak of the laser output was delayed up to 5.5 ms relative to the neutron pulse in He-CO₂, He-N₂-CO, Ne-CO and Ne-CO₂ mixtures while no delay was observed in He-CO mixtures. Lasing was obtained with helium pressures from 20 to 800 T, Ne pressures from 100 to 200 T, CO from 0.25 to 20 mT, N₂ from 0.5 to 5 mT, and CO₂ from 0.1 to 25 mT in the respective mixtures