Consider a gas at room temperature in a container that is being pumped using a plasma discharge. Assume that there is a population inversion between states 1 and 2 (N2>N1) and the system is Doppler broadened. Two optical beams (beam A and beam B ) are incident on the gas from the same direction and have frequencies (ν1 and ν2 ) that are amplified by the gain.
a) Sketch the intensity of beam A as a function of beam B.