Optical modulation in optical recording accompanied by wavelength conversion
文献类型：专利
| 作者 | OKAZAKI YOJI; KAMIYAMA KOJI |
| 发表日期 | 1990-04-24 |
| 专利号 | JP1990111568A |
| 著作权人 | FUJI PHOTO FILM CO LTD |
| 国家 | 日本 |
| 文献子类 | 发明申请 |
| 其他题名 | Optical modulation in optical recording accompanied by wavelength conversion |
| 英文摘要 | PURPOSE:To enable a high gradation image to be recorded at high speed by a method wherein a minimum drive current is established at a value slightly larger than threshold current, and a semiconductor laser beam is directly modulated. CONSTITUTION:For a light emission level command signal Vref by a table 12 and D/A converter 13, one among values of dividing a space between a minimum value Vref1 and a maximum value Vref2 at an equal interval is so set as to be taken according to an image signal S Then, the minimum value Vref1, i.e., a value for giving minimum drive current Imin to a semiconductor laser 17 is so established that a value slightly larger than threshold current Ith is taken as the minimum drive current Imin. Therefore, even though natural emission light is included in a light beam 18 incident to an optical wavelength conversion element 30, since a wavelength of the light beam 18 is not converted and is cut with a filter 24, intensity of a light beam 18'' emitted from the light wavelength conversion element 30 basically corresponds to only intensity of a laser beam emitted from the semiconductor laser 17. |
| 公开日期 | 1990-04-24 |
| 申请日期 | 1988-10-20 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/59588]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | FUJI PHOTO FILM CO LTD |
| 推荐引用方式 GB/T 7714 | OKAZAKI YOJI,KAMIYAMA KOJI. Optical modulation in optical recording accompanied by wavelength conversion. JP1990111568A. 1990-04-24. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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