Optical head apparatus including a waveguide layer with concentric or spiral periodic structure
文献类型：专利
| 作者 | NISHIWAKI, SEIJI; TAKETOMI, YOSHINAO; UCHIDA, SHINJI; TOMITA, TAKAAKI; ASADA, JUNICHI |
| 发表日期 | 1993-04-06 |
| 专利号 | US5200939 |
| 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 a waveguide layer with concentric or spiral periodic structure |
| 英文摘要 | PCT No. PCT/JP89/00796 Sec. 371 Date Apr. 4, 1991 Sec. 102(e) Date Apr. 4, 1991 PCT Filed Aug. 2, 1989 PCT Pub. No. WO90/01768 PCT Pub. Date Feb. 22, 1990.An optical head arranged in such a manner that light emitted from a semiconductor laser (8) is inputted and coupled in a waveguide layer (3C) by a grating coupler (4C) having a concentric or spiral structure formed by concavities and convexities so as to convert light into waveguide light (12C) passing toward to outer periphery in the layer, the waveguide light (12C) is shifted at the outermost peripheral portion of the waveguide layer (3C) to a waveguide layer (3B) so as to convert the waveguide light (12C) into waveguide light (12B), the waveguide light (12B) is radiated by a grating coupler (4B) having a concentric or spiral periodical structure, the concentrically polarized (or radially polarized) light (13) is converted into linearly polarized light (14) by a polarizing element (10B) so as to be converged on the reflection surface (16) of the optical disc, light reflected from the reflection surface (16) is again converted into concentrically polarized (or radially polarized) light (17A) and (17B) by the polarizing element (10B) so as to be inputted and coupled in waveguide layers (3A) and (3B) by a grating coupler (4A) and the grating coupler (4B), and then to be turned into waveguide light (18A) and (18B) each of which passes through the layer, and the waveguide light (18A) and (18B) is radiated at the end portions of the waveguide layers (3A) and (3B) so as to be respectively received by photo detectors (6A) and (6B) so that a control signal and a reproduction signal are obtained. |
| 公开日期 | 1993-04-06 |
| 申请日期 | 1989-08-02 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/35935]  |
| 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 a waveguide layer with concentric or spiral periodic structure. US5200939. 1993-04-06. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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