Apparatus for measuring the mode quality of a laser beam
文献类型：专利
| 作者 | JOHNSTON, JR., THOMAS F. |
| 发表日期 | 1992-01-07 |
| 专利号 | US5078491 |
| 著作权人 | COHERENT, INC., A CORPORATION OF DELAWARE |
| 国家 | 美国 |
| 文献子类 | 授权发明 |
| 其他题名 | Apparatus for measuring the mode quality of a laser beam |
| 英文摘要 | A method and apparatus for determining the quality of a multimode laser beam (10). In the preferred embodiment, the apparatus includes a lens (32) for creating a transformed or imaged waist from the input beam. The location of the transformed beam waist and its diameter are then determined. These steps can be carried out by chopping the beam using a rotating hub (34) having apertures (36,38) for selectively passing the beam. Preferably, one of the apertures has a pair of 45 DEG knife edges (40,42). The transmission of the beam past the knife edge is monitored by a detector (30). In operation, the lens focal position is varied while the transmission of the beam past the knife edge is monitored in order to locate and measure the diameter of the transformed waist. The diameter of the beam at one other known location is measured. A processor then calculates beam quality by fitting these measurements to a mathematical model. Once the quality of the beam is calculated, the location of the original beam waist and its diameter can be derived. Once all of the beam parameters are derived, the propagation characteristics of the beam can be predicted. In one embodiment of the subject invention, the device includes a blocking member (602) having a knife edge (604) disposed perpendicularly to one of the knife edges of the apertures carried on the hub. The blocking member is translated in discrete steps for each revolution of the hub. The measurement of the power transmitted past the knife edge and blocking member can be used to generate a two-dimensional pixel map of beam intensity. |
| 公开日期 | 1992-01-07 |
| 申请日期 | 1990-04-26 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/34420]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | COHERENT, INC., A CORPORATION OF DELAWARE |
| 推荐引用方式 GB/T 7714 | JOHNSTON, JR., THOMAS F.. Apparatus for measuring the mode quality of a laser beam. US5078491. 1992-01-07. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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