Detecting polarization state of an optical wavefront
文献类型：专利
| 作者 | ASTHANA, RAHUL; MILLER, ROBERT D.; SCHELLENBERG, FRANKLIN M.; SINCERBOX, GLENN T.; ZAVISLAN, JAMES M. |
| 发表日期 | 1991-07-16 |
| 专利号 | US5031993 |
| 著作权人 | INTERNATIONAL BUSINESS MACHINES CORPORATION |
| 国家 | 美国 |
| 文献子类 | 授权发明 |
| 其他题名 | Detecting polarization state of an optical wavefront |
| 英文摘要 | An improved apparatus and method for detecting the polarization state of an optical wavefront is disclosed, which is especially suitable for use in an integrated magneto-optic recording head. An optically transparent waveguide structure (10) transmits TE and TM modes of the wavefront propagated as a beam coupled into the waveguide by a TE/TM grating coupler (16). In the waveguide structure is a periodic structure (21) comprising a birefringent mode separator that splits the propagating beam into TE and TM modes. The mode separator comprises an array of uniformly spaced volumes of identical configuration. Photosensitive devices (13,14) detect the intensity of the light contained within each of the separated beams. The signals from these photosensitive devices are used to determine the state of polarization of the optical wavefront. The periodic structure may, if desired, comprise regions of alternating birefringence, such as a Bragg grating, either in a waveguide layer or a cladding layer. Focal power is introduced (1) by providing focal power in the input grating coupler to the waveguide with a curved grating structure, (2) by varying the pitch of the birefringent mode separator extending in a direction transverse to the optical axis of the propagating beam, or (3) by introducing a surface grating with a varying pitch in a direction transverse of the optical axis. |
| 公开日期 | 1991-07-16 |
| 申请日期 | 1989-11-16 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/35957]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | INTERNATIONAL BUSINESS MACHINES CORPORATION |
| 推荐引用方式 GB/T 7714 | ASTHANA, RAHUL,MILLER, ROBERT D.,SCHELLENBERG, FRANKLIN M.,et al. Detecting polarization state of an optical wavefront. US5031993. 1991-07-16. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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