Cascaded coupled supersymmetric semiconductor lasers with high power conversion efficiency

Supersymmetric semiconductor lasers, emitting around 1064.0 nm, are designed and fabricated that are based on two cascaded coupled supersymmetric transformations to filter out high-order modes of transverse wide waveguides. Combined with the design of a lateral narrow ridge waveguide with a width of 5.0 μm and a cavity length of 0.5 mm, supersymmetric lasers achieve a single-lobe far-field pattern at the temperature of 25°C, up to an injection current of 250.0 mA, with the continuous-wave output power of 230.0 mW. The maximum efficiency and output power of supersymmetric lasers are 61.4% at an injection current of 80.0 mA, and 276.1 mW at an injection current of 300.0 mA without obvious thermal runover, respectively. Our works offer new insight into mode control of wide waveguides.