Filament displacement and refraction losses in a stripe-geometry AIGaAs d.h. laser

The far-field, near-field and waist-intensity distributions are investigated in the nonlinear flux-current regime (kink) of a stripe-geometry d.h. laser at each of its two facets. The results are interpreted as a displacement of a deformable light guide or filament within the laser stripe, which acts as an additional built-in antiguide. Asymmetries in the far-field side-lobe intensities indicate enhanced refraction losses of the displaced filament towards that antiguide boundary towards which the near field moves and the far-field main lobe turns.