Application of spectral density of transitions in semiconductor laser theory

In this paper the formulas for spectral speed of an emission, for gain, for spectral - volume energy density of spontaneous radiation, for modulation of spontaneous radiation output power spectrum near to a threshold, based on formula for spectral density of transitions, are derived. The contrast modulation index m
_k
was defined; using of m
_k
determines more split-hair accuracy of definition |thetas| from experimental data.