Surface emitting laser device, surface emitting laser array, optical scanning device, and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorsHiroshi Motomura, Shunichi Sato
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Abstract
A disclosed surface emitting laser device includes an oscillator structure including an active layer, semiconductor multilayer reflection mirrors sandwiching the oscillator structure, an electrode provided on an emitting surface where light is emitted in a manner such that the electrode surrounds an emitting region, and a dielectric film formed in at least one region outside a center part of the emitting region so that a refractive index of the region outside the center part of the emitting region is less than the refractive index of the center part of the emitting region. When viewed from an emitting direction of the light, a part of the electrode overlaps a part of the dielectric film.
Claims20
A surface emitting laser device comprising:
- an oscillator structure including an active layer;
- semiconductor multilayer reflection mirrors sandwiching the oscillator structure;
- an electrode provided on an emitting surface where a light is emitted, the electrode being provided in a manner such that the electrode surrounds an emitting region that includes a center part and another region outside the center part;
- and
- a dielectric film formed in at least said another region of the emitting region so that a reflectance of said another region outside the center part of the emitting region is less than the reflectance of the center part of the emitting region, wherein
- the dielectric film extends from said another region of the emitting region into an additional region external to the emitting region, and
- when viewed from an emitting direction of the light, a part of the electrode overlying said additional region overlaps a part of the dielectric film.
Dependencies are inferred from the claim text.