The relation between composition in laser absorption region and ambient pressure

In this paper, the compositions in a laser absorption region can bedetermined from the experiment of laser impulse coupling. When theambient pressure varies from 9325 to 33325Pa, the compositions arevapour and plasma; while from 35325 to 101325Pa, they are ambient airand plasma. By analysing the relation between the degree ofcompression and the ambient pressure, the compositions can bedetermined and the variation of plasma can be explained.