Comments on the paper of A Yu Belonogov, A V Startsev, Yu Yu Stoilov, Cho Sung-Joo «Fluorescence of dyes at supersaturation pump powers»

In the above mentioned paper, Belonogov et al. showed that illumination of a phenalemine F-510 solution with a laser beam of high power density P does not alter the excited-state lifetime. It follows from their results that the anomalously high intensity of the fluorescence of complex molecules, observed earlier, can hardly be attributed to an increase in the spontaneous emission probability A. An analysis of the results of Belonogov et al. reveals that they investigated the fluorescence at power densities P below the threshold when the probability A is independent of P.