Abstract
Nineteen new laser lines in the 11-μm wavelength region have been observed in cw oscillation from a CO2 laser with a high-Q, high-resolution cavity at a higher than usual current density. The frequency of each line has been measured using heterodyne frequency measurement techniques. Analysis of the frequencies showns that 15 lines are rotation-vibration transitions of the 0112-[1111, 0311]I band (the first sequence hot band) of the CO2 molecule and four lines belong to the rotation-vibration transitions of the 0221-[1220, 0420]I band of CO2. Copyright 1995 IEEE