Side-mode gain in semiconductor lasers

Murray Sargent, Stephan W Koch, Weng W. Chow

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Side-mode gain and coupling coefficients in semiconductor laser media are calculated with the use of a multimode Fourier technique valid both for mode spacings that are small compared with the carrier-carrier relaxation rates and for spacings comparable with these rates as predicted by the Boltzmann theory of Binder et al. [Phys. Rev. B 45, 1107 (1992)]. The medium is described by a free-carrier model that provides for carrierprobability pulsations around quasi-equilibrium Fermi-Dirac values. We find that population pulsations play just as important a role as spectral hole burning for mode spacings comparable with the intraband relaxation rates. For the carrier-carrier relaxation rates of Binder et al., side-mode gain is predicted to be smaller than the main-mode gain, leading to single-mode operation. However, for somewhat smaller intraband relaxation rates, side-mode gain is readily found that exceeds the single-mode gain, which would encourage multimode operation. In addition, we find that the gain and coupling coefficient spectra are sensitive to the k dependence of the carrier-carrier relaxation rates and might provide a useful way to measure these rates. We are also able to explain the asymmetric side-mode gain spectra for small beat frequencies in terms of the rapid decrease of the quasi-equilibrium Fermi-Dirac electron distribution just above the gain region.

Original languageEnglish (US)
Pages (from-to)1288-1298
Number of pages11
JournalJournal of the Optical Society of America B: Optical Physics
Volume9
Issue number8
DOIs
StatePublished - 1992

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semiconductor lasers
spacing
coupling coefficients
beat frequencies
hole burning
coefficients
electron distribution

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Statistical and Nonlinear Physics

Cite this

Side-mode gain in semiconductor lasers. / Sargent, Murray; Koch, Stephan W; Chow, Weng W.

In: Journal of the Optical Society of America B: Optical Physics, Vol. 9, No. 8, 1992, p. 1288-1298.

Research output: Contribution to journalArticle

Sargent, Murray ; Koch, Stephan W ; Chow, Weng W. / Side-mode gain in semiconductor lasers. In: Journal of the Optical Society of America B: Optical Physics. 1992 ; Vol. 9, No. 8. pp. 1288-1298.
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