Abstract
A high-pressure waveguide CO2 laser was used to measure the impact broadening Δνr0, saturation intensity Isat and contrast of 192OsO4 saturated absorption resonances in the 28.46 THz range. Values of these parameters in the pressure range p = 0.5–10 mTorr are given for both a traditional resonance due to a transition from an excited vibrational-rotational state and also for a higher-intensity resonance corresponding to the A22P (46) transition from the ground state. The parameters Δνr0 and Isat for both resonances are approximately the same in the pressure range under study and for p < 1 mTorr they are Δνr0 (p) = (30 + 5)p kHz and Isat(p) = (15 ± 3)pm μW/ cm2, where 1 < m < 2. The minimum relative width of the resonances in the measurements was 5 × 10~10. It is shown that the nonlinear character of the dependence Δνr0 (p) and Isat(p) agrees with the concepts of selective elastic scattering of molecules at small angles during collisions. An estimate is given of some frequency characteristics of a CO2/OsO4 laser at low OsO4 vapor pressures in an external cell.
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