%0 Journal Article
%T Incoherent "Slow and Fast Light"
%A V. S. Zapasskii
%A G. G. Kozlov
%J Physics
%D 2009
%I arXiv
%R 10.1364/OE.17.022154
%X We show experimentally that the effects of "slow and fast light" that are considered to be caused by spectral hole-burning under conditions of coherent population oscillations (CPO) can be universally observed with incoherent light fields on objects with the pure-intensity nonlinearity, when such an interpretation is inapplicable. As a light source, we used an incandescent lamp and as objects for study, a photochromic glass and a thermochromic coating. The response of the objects to intensity modulation of the incident light reproduced in all details the commonly accepted experimental evidences of the "light with a negative group velocity" and "ultraslow light". We come to conclusion that so far there are no experimental works providing evidence for real observation of the "CPO-based slow or fast light".
%U http://arxiv.org/abs/0907.4902v1