Propagation of a 575-nm dye laser beam through nitrogen

The quasi-random model of molecular band absorption is used to study the interaction of a dye laser beam, tuned to 575 nm, with the absorption lines of nitrogen. Values of transmittance, averaged over intervals of 0.2 cm−1, are obtained for absorber thickness 0.2 and 10 atmosphere centimeters in the frequency interval 17,386-17,397 cm−1. From these values, intensities of the absorption lines in the first positive system of N2 are simulated.