| 摘要 |
The present invention provides a two-dimensional photonic crystal surface-emitting laser light source capable of producing a beam that is not accompanied by unnecessary side lobes. A window-shaped electrode 36 having a central window 361 devoid of the electrode material is provided on the surface of a device substrate 31 from which surface emission is extracted. A mount surface electrode 37 having an area smaller than that of the window-shaped electrode 36 including the window 361 is provided on a mount surface 38. The distance between the device substrate 31 and the active layer 32 is larger than that between the mount surface 38 and the active layer 32. When a voltage is applied between the electrodes, electric charges are injected into the active layer and emission is obtained. Then, a component of light having a specific wavelength is amplified by a two-dimensional photonic crystal 33, whereby a laser oscillation is produced. The laser light is extracted through the window 361 to the outside. Since the window-shaped electrode 36 does not block the emission of light, the emitted light never forms side lobes due to interference. The positioning of the active layer 32 close to the mount surface 38 significantly enhances the heat-radiating effect.
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