Two color oscillations of TE-CO2 laser and applications to two photon process of optically pumped FIR laser

We have developed the resonance system which is able to operate a TE-CO₂ discharge tube in two color emission source. The two color source is excellent in pumping efficiency, spacial overlap and time synchronization of the two emission CO₂ lines. We indicate that the competitive operation of the two emissions is well explained by a simple model. When a TE-CO₂ laser operates at the total pressure of below half atmospheric pressure, we make clear in this work that the operation of a TE-CO₂ laser forms “depression” like hole burning, with regards to the J of the upper laser level by J-J collisional relaxation during the laser emission. As an example of the two-photon source, two-photon pumping of NH₃ and FIR emissions are given in this paper.