Diode lasers with active and/or cladding regions whose thicknesses vary spatially parallel to the p-n junction are analyzed. It is shown that lateral real-refractive-index waveguiding occurs and that a diffusion gradient exists which propels the injected charges into the lasing modal volume. Lateral mode patterns and thresholds are calculated and sensitivity to higher-order lateral mode oscillation is evaluated for various stripe widths and spreading resistances. Results are shown to agree well with experimental data.
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Streifer et al. (1980) studied this question.
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