Possibilities of manipulating the Rabi frequency and luminescence rate from degenerate-level systems as well as the velocity of self-induced transparency of multi-level media are studied using a unitary transformation. The Rabi frequency and luminescence rate of an electronic system whose ground level is degenerate and coupled to a resonant mode are found to depend on the level of the degeneracy. The velocity of multi-mode optical solitons in a multi-level medium is found to be influenced by the number of propagating resonant pulses. Physical realizations of relevant systems are proposed.

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The experimental results of "Iskra-5" laser operation conversion at the second harmonic. (X = 657.6 ni-n) are presented. The experiments were carried out with DKDP crystals of big aperture (size 32 x 33 x 2 cm). The scheme of one channel was upgraded for optimization of second harmonic generation. Maximum conversion efficiency has been achieved for primary laser intensity of 1-2 GW/cm2. A second harmonic output of 500 J has been obtained at 60% of technical efficiency.