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A simple theoretical description is proposed aiming at a qualitative explanation of the observed in 11 dependences of the fluorescence from the resonant Rb levels excited by a single frequency diode laser on the magnetic field, when Hanle effect configuration of the experiment is used. The components of the statistical tensor for population and longitudinal alignment are calculated by iteration method up to fourth order terms. The spontaneous emission transfer influence is taken into account. A good qualitative agrement between calculated and experimentally observed resonances is obtained.

Laser induced Galvanic Signals (LIGS) were observed in a Se- buffer gas hollow cathode (HC) discharge irradiated by He- Se + or cw dye lasers. Radial and current dependences were studied. A similarity of the radial dependences for the two buffer gases He and Ne and maximum in the current dependences are registered. The possible mechanisms which form GS responses in Se HC discharge are discussed.

Resonances with complex shape have been obtained experimentally in the magnetic field dependence of the optogalvanic signal induced in a Cu/Ne hollow cathode discharge by 632.8 nm laser radiation. Either population trapping or transfer of coherence are considered as possible mechanisms of formation of these resonances. Both of them, however, appear insufficient to obtain full qualitative explanation of the observed dependencies.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.