Surface emitting laser, electronic device, and method for manufacturing surface emitting laser

A method for manufacturing a surface emitting laser, the method comprising:

• a step of laminating a structure including a laminated structure in which a first active layer, a selected oxide layer, a tunnel junction, and a second active layer are laminated in that order on a first multilayer film reflector, and laminating at least a second multilayer film reflector on the structure to generate a laminate;
• a step of etching the laminate until at least a side surface of the selected oxide layer is exposed to form a mesa;
• and
• a step of selectively oxidizing the selected oxide layer from the side surface side to form an oxide confinement layer, wherein
• a second oxide confinement layer disposed between the first active layer and the second active layer,
• a third oxide confinement layer disposed between the second active layer and the third active layer, and
• the first oxide confinement layer, the second oxide confinement layer, and the third oxide confinement layer are different from each other in optical thickness.