Subnarrow linewidth, hole, and split in micromaser spectrum
Ning Lü · Physical Review Letters · 1993
By calculating the two-time correlation function of a one-photon micromaser, we study the line shapes and linewidth of the micromaser spectrum. We find that the half-width at half maximum of the spectrum can be less than the smallest decay rate of the off-diagonal density-matrix elements ${\mathrm{\ensuremath{\rho}}}_{\mathit{n},}$${\mathit{n}}_{+1}$, that a hole can appear in the spectrum, and that the spectrum can be split by shifted spectral components.