Problem of reproducibility of the output frequency of a CO2/OsO4 laser

Two frequency-stabilized CO₂/OsO₄ lasers were used in an investigation of the behavior of the peak of a narrow nonlinear resonance in the spectrum of the ¹⁹²OsO₄ molecule. The investigation was carried out in a wide range of laser radiation intensities and OsO₄ pressures in an external absorption cell. There were no power or collisional shifts of the molecular transition frequency to within ~2×10^–11.