In this paper we continue the study of spectral composition of the converted radiation due to optical pumping of barium vapor with XeCl* laser. We propose a formation mechanism of the long-wave satellites in certain lines belonging to transitions into the metastable state of atomic barium 5d1D2. These satellites are difference frequencies, generated as a result of four-wave parametric oscillations (FWPO) process. The initial level of the FWPO process is the metastable state 5d1D2 of barium. The FWPO process involved the interaction of the Stokes frequency λS = 475 nm with two frequencies of stimulated cascade transitions of the barium atom. The proposed mechanism was experimentally verified for the case of the generation of long-wavelength infrared satellites located near the 6p1P10 → 5d1D2 barium atom transition.
optical pumping, nonlinear optics, stimulated electronic Raman scattering, four wave parametric process, amplified spontaneous emission, metal vapors