Semiconductor laser light source and optical information recording and reproducing device
文献类型：专利
| 作者 | YAMAWAKI TAKESHI |
| 发表日期 | 1991-04-18 |
| 专利号 | JP1991093045A |
| 著作权人 | CANON INC |
| 国家 | 日本 |
| 文献子类 | 发明申请 |
| 其他题名 | Semiconductor laser light source and optical information recording and reproducing device |
| 英文摘要 | PURPOSE:To reduce noise as against irregular reflected light from a laser light irradiation body by reflecting and feeding back a part of the emitted light of a semiconductor laser with single vertical mode oscillation, and continuously and periodically changing the light quantity. CONSTITUTION:Light emitted from the semiconductor laser 1 comes to parallel light in a collimator lens 4, and is divided in a beam splitter 5. One goes to a mirror disk 2, and the other is set to a light source for optical information processing. High reflection areas 11 and low reflection areas 12 are alternately formed on the substrate 10 of the disk 2 at the intervals of the diameter of a spot, and a moor 3 rotates the substrate 10. Then, a reflected light quantity from the disk 2 is periodically changed by continuously changing the optical spot 13 converged in a condensing lens 6. Reflected light returns to the emission part of the laser 1 through the same optical route and the change of a threshold current of the laser 1 is generated. It is desirable to set a modulation frequency to be more than 50MHz for making the laser 1 into a multi-mode and for sufficiently deteriorating coherence. |
| 公开日期 | 1991-04-18 |
| 申请日期 | 1989-09-05 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/59647]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | CANON INC |
| 推荐引用方式 GB/T 7714 | YAMAWAKI TAKESHI. Semiconductor laser light source and optical information recording and reproducing device. JP1991093045A. 1991-04-18. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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