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Vibrational cooling of the active medium of a laser by the intra-cavity radiation flux

We report, we believe for the first time, experimental values of the rotational and vibrational temperatures of in an operative laser. The device under study is a DC-excited fast-axial-flow laser and can be viewed as a scaled down version of an industrial laser for cutting and welding. The gas inlet section is optimized for gain symmetry. The laser operates at a maximal electro-optic efficiency of 26%, reaching output from a 19 mm bore discharge at 24%. An infrared tuneable diode laser spectrometer was adapted to allow transverse probing of the discharge. The results show the significant cooling effect of the intra-cavity radiation intensity on the vibrational modes, and the observed gas temperature drop associated with the extraction of laser power is consistent with the mass flow through the discharge.