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Separate-confinement heterostructure lasers with thin active regions are analyzed. For four different interiorcladding-region refractive-index spatial variations, i.e., step, triangular, parabolic, and inverted parabolic, waveguidemodes are calculated and thresholds are compared. Based on optical considerations alone, the step-indexprofile has the lowest threshold; however, for optimum cladding thicknesses the differences are not great.
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Streifer et al. (1983) studied this question.
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