Semiconductor laser and optical chip including same

The embodiment of the invention provides a semiconductor laser and an optical chip comprising the same, and belongs to the field of semiconductor lasers. The semiconductor laser comprises one or more ridge waveguides, each ridge waveguide comprises a ridge region and a flat plate region, the width of each ridge region is smaller than or equal to the thickness of each flat plate region, the ridge regions and the flat plate regions are waveguides with the same refractive index, at least one part of each ridge region is a P-type doped waveguide, and each flat plate region is an n-type doped waveguide. Because the width of the ridge-shaped region of the ridge waveguide is smaller than or equal to the thickness of the flat plate region, the mode field distribution of a fundamental mode is obviously different from the mode field distribution of a high-order mode, and at least one part of the ridge-shaped region is the P-type doped waveguide, so that the loss of the high-order mode can be obviously increased, and th