The slow-light effect, which implies reduction of the group velocity of light by many orders of magnitude, is considered
to be one of the most exciting discoveries in quantum optics of the last decade. The physics underlying the effect is
related to an extremely steep dispersion of the medium in a very narrow region of its transparency, while all the
manifestations of the effect are usually reduced just to a small pulse delay. Perhaps this is the reason why, after the
discovery of the slow-light effect, some of the simplest nonlinear phenomena associated with a retarded optical response
have been implicitly revised and assigned to reduction of the light group velocity. In this lecture, a few examples of
common inconsistencies in the area of the slow-light physics will be presented.
We draw attention here to a new optical instrument for studying transparent doped crystals and glasses. The device employs high sensitivity of laser polarimetry for detection of small magnetization alterations and offers a number of new research capabilities.
The capabilities of the laser-polarimetric version of Gorter's paramagnetic relaxation
technique are considered. The developed method is shDwn to reveal high
sensitivity and to enable the study of a number of energy and structural properties
of paramagnetic solids unachievable for any other spectroscopic technique.
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