Abstract

It was pointed out by Yamanishi and Lee [1] that the optical gain spectra calculated with the Lorentzian line shape function deviate from the experimental results. Especially, an anomalous absorption region appears at photon energies below the band-gap in the gain spectra as long as the Lorentzian line shape is used. Moreover, the detailed balance between absorption and emission of photons requires that the transparency point in the gain spectra coincide with the Fermi (or quasi Fermi)-level energy [2,3]. In general, the gain spectra with the Lorentzian do not satisfy the detailed balance condition, either.

© 1996 Optical Society of America