摘要
The transmission process of radiation in absorbing medium is a multiple process of alternate absorbing and reemitting, i. e. a light pulse injected into the medium undergoes a series of absorption and reemitfing processes before it darts out of the medium. The effect of this radiation imprisonment can introduce some variance of temporal pulse distribution. The atomic lifetime, transition probabilities and the density of atoms in the medium are all the major factors producing this effect. Studying this problem will help understand the relationship between the time
