Surface emitting laser, surface emitting laser array, and image forming apparatus including surface emitting laser

摘要

A surface emitting laser that oscillates at a wavelength » includes an upper reflector (170), a lower reflector (120), an active layer (150), and a spacer layer (130). The spacer layer (130) is a laminated structure that includes a first semiconductor sublayer (131) having a composition of Al x Ga 1-x As (1 ‰¥ x > 0) and a second semiconductor sublayer (132) having a composition of Al y Ga 1-y As (1 > y > 0 and x > y).