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US 7,406,112 B2Granted
Surface-emitting laser, method for manufacturing surface-emitting laser, device and electronic apparatus
AssigneeSeiko Epson Corporation
InventorTakayuki Kondo
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Abstract
The present invention provides surface-emitting lasers that reduce a laser emission angle and are readily manufactured. Methods for manufacturing the surface-emitting lasers, devices, and electronic apparatuses are also described. The lasers are characterized in that a resonator of a surface-emitting laser includes a light emission surface having a portion that is provided with a lens shaped section formed from a semiconductor layer in a lens shape.
Claims7
A surface-emitting laser comprising a resonator, wherein the resonator includes:
- a light emission surface having a portion that is provided with a lens shaped section, the lens shaped section formed from a semiconductor layer having a bandgap greater than a bandgap corresponding to an energy of a laser light of the surface-emitting laser in a lens shape,
- a columnar section formed in a convex shape on a semiconductor substrate, the light emission surface being defined by an upper surface of the columnar section,
- a contact layer exposed around the lens shaped section on the light emission surface, and
- the contact layer comprises a semiconductor layer having a bandgap smaller than the bandgap of the semiconductor layer composing the lens shaped section.
1 more element
Dependencies are inferred from the claim text.