Semiconductor laser device and method for fabricating the same

Abstract

A semiconductor laser device includes a red-light-emission portion and an infrared-light-emission portion on a single substrate. The red-light-emission portion has a structure in which an AlGaInP-based active layer is sandwiched by a first cladding layer of a first conductivity type having a striped portion and a second cladding layer of a second conductivity type. The infrared-light-emission portion has a structure in which an AlGaAs-based active layer is sandwiched by a third cladding layer of the first conductivity type having a striped portion and a fourth cladding layer of the second conductivity type. The first, second, third, and fourth cladding layers are all made of an AlGaInP-based material. When in these layers, the Al:Ga contents are represented by X1:1-X1, X2:1-X2, X3:1-X3, and X4:1-X4, respectively, X1>=X2 and X3>=X4 are satisfied.

Description

Semiconductor laser device and manufacturing method thereof technical field The present invention relates to a semiconductor laser device, especially a light source for an optical head related to an optical disc device, and a semiconductor laser that emits light in a red region and an ultraviolet region as a light source in other electronic devices and information processing devices. Background technique Currently, a large-capacity digital video disc (DVD) capable of high-density recording and a digital video disc (DVD) device for recording and reproducing the same are commercially available, and are attracting attention as products whose demand will gradually increase in the future. Digital Video Disc (DVD) achieves high-density recording, so as a laser light source for recording and reproduction, AlGaInP series semiconductor lasers with an emission wavelength of 650nm are used. For this reason, the optical head of the digital video disc (DVD) device in the past is to uti...

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Problems solved by technology

As a result, in the case of high output operation of 200mW or more, reliability cannot be guaranteed only by AR / HR coating (especially long-term reliability of thousands of hours or more)

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