Surface-emitting laser element, surface-emitting laser array, optical scanner device, and image forming apparatus

摘要

A disclosed surface-emitting laser element (100) includes a substrate (101), multiple semiconductor layers stacked on the substrate including a resonator structure including an active layer (105), a semiconductor multilayer mirror on the resonator structure (107), and a confined structure (108a,108b) where a current passage region (108b) is enclosed by at least an oxide (108a) generated by oxidation of part of a selective oxidation layer containing aluminum, an electrode (113) provided around an emission region, and a dielectric film (115A,115B) provided in a peripheral portion within the emission region and outside a central portion of the emission region to make a reflectance of the peripheral portion lower than that of the central portion. The dielectric film is arranged such that a reflectance of a high-order transverse mode in a second direction is higher than that in a first direction, and a width of the current passage region in the first direction is greater than that in the second direction.