Planar stripe with waist/notch /swan/ injection laser

This letter describes a novel planar stripe-geometry injection laser (termed the swan laser), showing a single transverse and longitudinal mode operation, made by a simple fabrication method. This stripe geometry is composed of a main stripe section with a width of about 10 microns and a mode-control section with a nominal width near the carrier diffusion length less than 5 microns; the shape looks like a waist/notch along the stripe. The kink of the light output does not appear at a power level of more than 20 mW/facet.