Thirty one new cw far-infrared laser lines have been discovered in COF2 optically pumped by a CO2 laser and a N2O laser, in a metallic waveguide resonator. This number appreciably increases the number of eighteen lines appearing in the literature. Moreover, some of the new lines show that intense far-infrared laser action might be obtained with an optimized cavity, as it was the case for some of the previously reported lines. Twenty-seven, amongst the thirty one new lines, have been fully identified.
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Gastaud, C., Redon, M. & Fourrier, M. New strong CW FIR laser actions and assignments in COF2 . Appl. Phys. B 47, 303–305 (1988). https://doi.org/10.1007/BF00716090