Patent ID: 8178364

Claim:
A method of performing a wafer level burn-in test for a plurality of surface-emitting laser devices formed on a wafer, wherein each of the surface-emitting laser devices includes a layer structure formed on a substrate, the layer structure including an active layer, wherein a layer portion including at least the active layer from among the layer structure is formed in a mesa-post, and a top surface of a peripheral area disposed around the mesa-post is higher than a top surface of the mesa-post, a first electrode formed on the top surface of the mesa-post, a pad electrode provided on the top surface of the peripheral area, wherein the first electrode and the pad electrode are electrically connected to each other, and a second electrode formed on a bottom surface of the substrate, and the method comprises: causing a plurality of contact electrodes arranged in a same plane with a pitch same as that of the surface-emitting laser devices to have contact with pad electrodes of the surface-emitting laser devices, respectively, the contact electrodes being electrically connected to each other; and applying a current to second electrodes of the surface-emitting laser devices and the contact electrodes.