In this work, we first presents a review of the work that research
teams have developed in collaboration in order to determine the optical
properties of plasmas during the recent years, and showing the
achievements reached. The second part of this paper is devoted to one of
these improvements, which is to include reabsorption of the radiation in
the calculations of dense optically thick plasmas in non-LTE conditions.
Two models recently developed for this purpose are presented. The
quantitative study was focused on aluminum plasmas, which was obtained
recently at LULI experiments.
