Quantum Theory of an Optical Maser. II. Spectral Profile
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In Paper I of this series, we derived equations of motion for a quantum-laser field interacting with atomic reservoirs. In the usual region of sustained oscillation, the off-diagonal elements of the radiation density matrix n,n+k(t) were found to have an expontential decay associated with phase diffusion. In I we found the spectrum of the laser radiation by calculating the single time-ensemble average electric field implied by n,n+1(t). This electric field was then treated as a classical variable whose Fourier analysis gave the spectrum. In the present paper, we establish the validity of this procedure by analyzing a simple model for a spectrometer. It is also shown that the same spectrum can be obtained from a two-time correlation function derived from the equations of motion. 1968 The American Physical Society.
author list (cited authors)
Scully, M. O., & Lamb, W. E.
complete list of authors
Scully, Marlan O||Lamb, Willis E