Theory of gain in quantum-wire lasers grown in V-grooves |
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Authors: | Citrin D.S. Chang Y.-C. |
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Affiliation: | Max-Planck-Inst. fuer Festkorperforschung, Stuttgart; |
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Abstract: | Theoretical calculations of gain, refractive index change, differential gain, and threshold current for GaAs-AlGaAs quantum-wire lasers grown in V-shaped grooves are presented. The theoretical model is based on the density-matrix formalism with intraband relaxation, and the subband structure is calculated within the effective bond-orbital model. For the quantum-wire geometry treated, agreement with the observed subband spacings is found. Because of the small overlap of the optical field with the active region for a single quantum wire, lasing threshold is reached only when several subbands are filled |
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