Two-dimensional photonic crystal surface-emitting laser light source
First Claim
1. A two-dimensional photonic crystal surface-emitting laser light source, comprising:
- a) a substrate made of a material that is transparent to light having an objective wavelength;
b) an active layer located below the substrate;
c) a two-dimensional photonic crystal for amplifying light having the objective wavelength, where the two-dimensional photonic crystal is located either between the substrate and the active layer or below the active layer and includes a plate-shaped body material in which a large number of modified refractive index areas whose refractive index differs from that of the body material are periodically arranged;
d) a mount layer to be in contact with an external member when the light source is mounted, where the mount layer is located below the two-dimensional photonic crystal and the active layer in such a manner where a distance between a lower surface of the mount layer and the active layer is smaller than a distance between an upper surface of the substrate and the active layer;
e) a window-shaped electrode on the upper surface of the substrate, where the electrode has a window for allowing laser light having the objective wavelength to pass through; and
f) a mount surface electrode located on the lower surface of the mount layer and having an area smaller than that of the window-shaped electrode inclusive of an area of the window.
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Accused Products
Abstract
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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Citations
11 Claims
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1. A two-dimensional photonic crystal surface-emitting laser light source, comprising:
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a) a substrate made of a material that is transparent to light having an objective wavelength; b) an active layer located below the substrate; c) a two-dimensional photonic crystal for amplifying light having the objective wavelength, where the two-dimensional photonic crystal is located either between the substrate and the active layer or below the active layer and includes a plate-shaped body material in which a large number of modified refractive index areas whose refractive index differs from that of the body material are periodically arranged; d) a mount layer to be in contact with an external member when the light source is mounted, where the mount layer is located below the two-dimensional photonic crystal and the active layer in such a manner where a distance between a lower surface of the mount layer and the active layer is smaller than a distance between an upper surface of the substrate and the active layer; e) a window-shaped electrode on the upper surface of the substrate, where the electrode has a window for allowing laser light having the objective wavelength to pass through; and f) a mount surface electrode located on the lower surface of the mount layer and having an area smaller than that of the window-shaped electrode inclusive of an area of the window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification