Optical head apparatus including concentric, periodic grating in a waveguide
文献类型：专利
| 作者 | NISHIWAKI, SEIJI; TAKETOMI, YOSHINAO; UCHIDA, SHINJI; TOMITA, TAKAAKI; YONEZAWA, TAKETOSHI; MIZUNO, SADAO |
| 发表日期 | 1991-02-12 |
| 专利号 | US4991919 |
| 著作权人 | MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
| 国家 | 美国 |
| 文献子类 | 授权发明 |
| 其他题名 | Optical head apparatus including concentric, periodic grating in a waveguide |
| 英文摘要 | PCT No. PCT/JP88/01344 Sec. 371 Date Oct. 18, 1989 Sec. 102(e) Date Oct. 18, 1989 PCT Filed Dec. 28, 1988 PCT Pub. No. WO89/06424 PCT Pub. Date Jul. 13, 1989.This invention provides an optical head apparatus in which a grating coupler (8), which is formed on a circular region which has a center on an axis (18) and has a periodical structure with dents and projections in a configuration of concentric circles or spirals around the axis (18), input-couples laser light (7) emitted from a semiconductor laser (5) and turns it into waveguided light (16B) which transmits in a waveguiding layer (15B). The waveguided light (16B) is converted, in a region where the waveguiding layer (15B) and a waveguiding layer (15A) overlap each other, to waveguided light (16A) which transmits in the waveguiding layer (15A). By a grating coupler (9), formed on a ring-shaped area which is located around the axis (18), which has a periodic structure with dents and projections of a configuration of concentric circles or spirals around the axis (18), the waveguided light (16A) is radiated and focused onto points (FA), (FB) and (FC) which are located on the axis (18). Light reflected from a reflecting surface (19) is input-coupled by the grating coupler (9) and is converted to waveguided light (21) which transmits through the waveguiding layer (15A) toward the center. The waveguided light (21) is radiated at the innermost edge of the waveguiding layer (15A) and the amount of radiated light is detected by a light detector (10) to obtained control signal and playback signals. |
| 公开日期 | 1991-02-12 |
| 申请日期 | 1988-12-28 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/35914]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
| 推荐引用方式 GB/T 7714 | NISHIWAKI, SEIJI,TAKETOMI, YOSHINAO,UCHIDA, SHINJI,et al. Optical head apparatus including concentric, periodic grating in a waveguide. US4991919. 1991-02-12. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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