A two-dimensional photonic crystal surface-emitting laser light source producing a beam without side lobes is provided. A window-shaped electrode having a central window devoid of the electrode material is provided on a device substrate. A mount surface electrode smaller than the electrode including the window is provided on a mount surface. The distance between the substrate and the active layer is larger than that between the mount surface and the active layer. When a voltage is applied, electric charges are injected into the active layer and emission is obtained. Light having a specific wavelength is amplified by a two-dimensional photonic crystal and extracted through the window without side lobes due to interference. The positioning of the active layer close to the mount surface significantly enhances the heat-radiating effect.
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