Laser action has been demonstrated for the 2P1/2–2P3/2 transition of iodine atom pumped by energy transfer from NCl(a1Δ) produced by a set of amine-based, all gas-phase chemical reactions. Continuous-wave laser output of 50 mW with 40 % duty factor is obtained from a stable optical resonator consisting of two 99.99 % reflective mirrors. The observed laser characteristics are reasonably explained by numerical model calculations.
