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The Role of FIR Emission in an Optically Pumped Multi-Line NH3 Laser

We have observed more than 50 new laser lines in NH3 pumped by a TEA CO2 laser operating on the R(30) 9.2 Urn transition. The new lines span the region from 9.3 μm to 13.8 μm. FIR cascade emission is responsible for energy transfer from the pumped antisymmetric to the lasing symmetric levels in the V2 band. A novel wedged transverse pumping scheme allows efficient use of pump energy and a compact device design. Application of this laser system to isotope separation of UF6 is discussed.