We present a novel technique for resonantly pumping a continuous-wave far-infrared NH3 laser with a line-tunable mid-infrared NH3 laser that is optically pumped by a CO2 laser. In this two-step process we first convert 10-μm CO2 laser photons into 11–13-μm NH3 laser photons, which are then converted into 60–400-μm photons in a far-infrared NH3 laser. Continuous-wave laser action on 10 far-infrared lines of 15NH3, including four new ones, has been obtained with a single CO2 laser pump line.
© 1996 Optical Society of America
Original Manuscript: February 27, 1996
Published: August 15, 1996
Maki Tachikawa and Kenneth M. Evenson, "Sequential optical pumping of a far-infrared ammonia laser," Opt. Lett. 21, 1247-1249 (1996)