High order Coherence Functions and Spectral Distributions as given by the Quantum Theory of Laser Radiation

Abstract

We propose and demonstrate a method for measuring the time evolution of the off-diagonal elements ${\rho }_{n,n+k}(t)$ of the reduced density matrix obtained from the quantum theory of the laser. The decay rates of the off-diagonal matrix element ${\rho }_{n,n+k}(t)$ (k=2,3) are measured for the first time and compared with that of ${\rho }_{n,n+1}(t)$, which corresponds to the linewidth of the laser. The experimental results agree with the quantum theory of the laser.