Optically pumped molecular phosphine submillimeter Stark laser

The Stark effect was used to reproduce in the cw regime six stimulated emission lines of a submillimeter PH₃ laser pumped by CO₂ laser radiation. Previously, these had only been obtained in the pulsed regime. Stark tuning of the output radiation frequency was observed for five of these lines. Detailed investigations were made of the character and scales of frequency tuning of the λ = 195 μm output radiation from the PH₃ laser.