Study of emission spectrum of tea CO2 lasers with intracavity absorber

The combination of high energy P-branch vibrational/rotational levels with the main laser transition of the CO2 molecule in a laser emission spectrum consisting of several lines, short radiation pulses with lengths equal to the rotational relaxation time increases in power by 20 to 40%. It is shown that by introducing selective losses it was possible to obtain the required simultaneous lasing of the vibrational/rotational lines. The optical cavity consisted of copper mirrors and a heat cell containing CO2 acting as a nonlinear absorber was located inside the cavity. The temperature of the intracavity cell was varied in the range of 400-700 K, and maximum amplification was obtained at 400 K while power fell off at higher levels.