New strong CW FIR laser actions and assignments in COF2

Thirty-one new CW far-infrared laser lines have been discovered in COF2 optically pumped by a CO2 laser and an 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, among the thirty-one new lines, have been fully identified.